X-Encontro-Nacional-de-Fisica-da-Materia-Condensada
X-Encontro-Nacional-de-Fisica-da-Materia-Condensada
X-Encontro-Nacional-de-Fisica-da-Materia-Condensada
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X ENCONTRO NACIONAL DE FI-SICA<br />
DA MATERIA CONDENSADA
X ENCONTRO NACIONAL<br />
DE FISICA<br />
DA MATERIA CONDENSADA<br />
PROGRAMA<br />
E<br />
RESUMOS
t<br />
'<br />
X ENCONFRO NACIONAL DE FiSICA OA NATgRIA CONDENSADA<br />
ComIssilo Orgenixadora:<br />
pror. Antonio Martins ilouelredu NeLo (1,USP) - Cuurdcuador<br />
Prof. Carlos Alberto dos Santos (UFGRN)<br />
Prof. Geraldo Alexandre Barbosa (UFNG)<br />
ProF. Nelson Stu<strong>da</strong>rt Filho (UFPE)<br />
Prof. SErgib Game (UNICANP)<br />
Fontes Patrocinadores: .<br />
FINEP - Financladore <strong>de</strong> Estudos e Projetos<br />
FAPESP - Fun<strong>da</strong>cilo <strong>de</strong> Amparo b Pesquisa do Estado <strong>de</strong> Ho Paulo<br />
FAPEmIG -Fun<strong>da</strong>cilo <strong>de</strong> Amparo b Pesquise do Estado <strong>de</strong> Minas Gerais<br />
CNPq Conselho <strong>Nacional</strong> <strong>de</strong> Desenvolvimento Cientifico a Tecnoleigico<br />
CAPES - Coor<strong>de</strong>neglo <strong>de</strong> Aperreigoemento <strong>de</strong> Pessoal <strong>de</strong> Nivel Superior<br />
MANGUS INDUSTRIAL S/A
Do Cambuquira a Caxambu: Des once <strong>de</strong><br />
En ccccc vs <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Hatiria Con<strong>de</strong>nsa<strong>da</strong> .<br />
Chn:num au dilrimu Uneontru <strong>Nacional</strong> do <strong>Fisica</strong> <strong>da</strong> MoOrio ll.n<strong>de</strong>nsa<strong>da</strong><br />
(ENFHC). I<strong>de</strong>alicado„ em 1977, como ms foro<strong>de</strong> canted d' ' <strong>de</strong> pea<br />
quisadores <strong>de</strong>s areas <strong>de</strong> Mecinica Es ' <strong>Fisica</strong> <strong>de</strong> Sali<strong>da</strong>'. o ENFHC<br />
vem nndo reallyado anualmnte. <strong>de</strong>s<strong>de</strong> 1971. em o pa info do Soeie<strong>da</strong><strong>de</strong><br />
Dranileira <strong>de</strong> Firoleo a o opuiu dos enti<strong>da</strong><strong>de</strong>s financindoras °facials. 0 mem<br />
plu e pionviriamn &aloe panquisodores enoriorom a realleacio <strong>de</strong> outrun on<br />
diferentes ireas <strong>da</strong> <strong>Fisica</strong>. Constatamos um '<strong>da</strong> 1 eroticism<br />
Lu tanto no miner° <strong>de</strong> partieipautes quanto no varie<strong>da</strong><strong>de</strong> dos campus abor<strong>da</strong>dos.<br />
figurate teehall euo ado a benvindo erumelmenta on partieipacio <strong>de</strong> estu<strong>da</strong>n<br />
ter <strong>de</strong> pas- graduatao . Una car= aaa aa Ica atual do ENFHC i a<br />
ear on Crupos <strong>de</strong> Traballto (Cr) abrongendo tipicoe qua<br />
no espalliam do Mali:vice i <strong>Fisica</strong> do Semicond do °tied 5 Hecinica Es<br />
t aa aa Ica, do Ciincis dos Hateriai ■ is <strong>Fisica</strong> Atimics e Molecular. C evi<strong>de</strong>nt'<br />
quo o intercimbio entre peaquillodoras <strong>de</strong> virias limas po<strong>de</strong> possibilitar uma<br />
visio rain abrangente don ireas &fins.<br />
A organisscio, tamanho a abrangincia doe BEMs tim provocado inten<br />
sa polimica na comuni<strong>da</strong>ds. Hi os quo sedum as vi-lo dividido pore mentor um<br />
carater mais informal; hi as quo quern transformi-10 as eoa gran<strong>de</strong> coalmen<br />
cia cam opreountotio formal <strong>de</strong> troballios; Ili on quo quern a sup expansio in<br />
<strong>de</strong>rini<strong>da</strong> as termos <strong>de</strong> nimero <strong>de</strong> participant's. Em geral, estes.teman tom si<br />
do dos no rotor <strong>da</strong>p discuasies <strong>da</strong> Assambliia Carel. In comemoracio dos<br />
<strong>de</strong>s 0008 <strong>de</strong> MM. a Copilot/a Organixadors (CO) plamejou ums sessio plena-<br />
✓im co<strong>de</strong>, 80 memo tempo qua seri apresentado o levantamento <strong>da</strong> <strong>Fisica</strong> <strong>da</strong> Ha<br />
Con<strong>de</strong>nsa<strong>da</strong> no pole. seri procodi<strong>da</strong> moo Avaliacio dos mica. Al, me-<br />
rinos quo sejam encaminbi<strong>da</strong>s ■ugestaes concratos do reformulacio do Eacontro<br />
pars a <strong>de</strong>vi<strong>da</strong> <strong>da</strong> Assemblila Coral.<br />
A CO do unresc neroOsita coolorecor as cologne quanta ao Rimer°<br />
<strong>de</strong> participant.. financiadoe polo Emcontro. Apoied ■ par manifentacio inequI-<br />
yarn <strong>da</strong> AnnemblAia Corot do IX ENFHC, a CO planejou em mikados <strong>de</strong> Juliae manna,<br />
do (em plena euforia do Nano Crusado), inns aaaa lie prevendo coo participa<br />
cio <strong>da</strong> orlon <strong>de</strong> 700 colegas. Com este objetivo.. Foram aolicitados as recur-<br />
Ova a foi <strong>de</strong>rinidn as local cam infra-estruturn suficiente pars /*rigor este<br />
mimeo', <strong>de</strong> participant's. Car recru<strong>de</strong>seimento do inflocio, o orcamento do<br />
IMEFIC licon seri/urine afetado, <strong>de</strong> main quo a CO. basea<strong>da</strong> on sunesairs <strong>de</strong> ■<br />
Coor<strong>de</strong>nadoren don OT. foi *briga<strong>da</strong>, a realixor cartes do ord.= <strong>de</strong> 4UZ no mime
o <strong>de</strong> partieipantes custeadoe polo <strong>Encontro</strong>. Demi& Forma, a participacio <strong>de</strong><br />
inimerus colegam IA pi<strong>de</strong> see assegura<strong>da</strong> is do financiamento polo sun<br />
inatituicio <strong>de</strong> origem. Aereditamos quo este foto posse coittribuir pare as<br />
discuasies sabre financiomento do ENFHC.<br />
A novi<strong>da</strong><strong>de</strong> do EDIVHC e ■ introduciu <strong>de</strong> uma ■essio permanents <strong>de</strong> pus<br />
tors. Aqueles quo vim npresentor uma Comunicacio Oral tambCm foram eocoraja -<br />
dos a mortar a potter <strong>de</strong> ■ tm centribuicio. Solicitamos mos colegas quo afi<br />
mem junto so poster o u9 <strong>de</strong> moo quarto ou outro stela <strong>de</strong> i<strong>de</strong>ntificacio pate<br />
facilitar a localizacio do expositor. As sesame <strong>de</strong> comunicacio oral serio<br />
bora-note ricidom ens rlocin a ur<strong>de</strong>m o no trmpo dimponivul Para aprounotocAu<br />
(total <strong>de</strong> 20 mioutos), <strong>de</strong> so<strong>da</strong> quo participants poesy cooceber o ■ eu pro<br />
prio rateiro peloe CT.<br />
Os ENPIICs too foram psico <strong>de</strong> discossies sobre necessidod,<br />
viabili<strong>da</strong><strong>de</strong> a abrangincia <strong>de</strong> as LaboratOrio <strong>de</strong> Radiate:in Si ice. Must<br />
mentor, ji instalado em Compinam. o la<strong>da</strong>uretOrio <strong>Nacional</strong> do Luc Sincrotron<br />
(IAS) a umm realido<strong>de</strong>. 0 sou Diretor-Prbai<strong>de</strong>nto„ Prof. Cylun E.T. Concalves<br />
<strong>da</strong> Silva, proferiri palestra in sessio pleniri ■ sabre o stoat estigio e perm<br />
peetivss do LIO.S.<br />
No ono possado, s Socie<strong>da</strong><strong>de</strong> America= <strong>de</strong> Otica (OSA) couce<strong>de</strong>u o Pre<br />
slam Flax Born ao . Prof. Horeb H. Nos 000000 ig, dm PUC-1J, em reconbecimento ■<br />
snail "contribuicies <strong>de</strong>ist:ma<strong>da</strong>m e voliosas a [earls do uspalbamento Niue is<br />
teorias do arco-iris e <strong>da</strong> la". Prof. Nuesenaweig op 00000 tiara no <strong>Encontro</strong><br />
a mamma palestra quo proferlu quando as outorga do peMsio. 0 En<br />
I boil <strong>de</strong> <strong>Fisica</strong> Estatistiea, STATIMYS, seri realimado no Brasil em<br />
1989. Para dimeutir a orgmnixacio dusty impurtonte memo foi convi<strong>da</strong>do u<br />
Prof. Constantino Tullis, do OPP. Recentemente, a comuni<strong>da</strong><strong>de</strong> <strong>de</strong> Semicoodu<br />
toren no Brasil tin <strong>de</strong>eenvolvido esforcos no sentido <strong>de</strong> implontar mo<strong>de</strong>rn°,<br />
equipamootos <strong>de</strong> crescisanto <strong>de</strong> ■struturas artificial' <strong>de</strong> ■emicondutores. 0<br />
BENFNC reuniri, nu m mesa redon<strong>da</strong>, rep dos d' grupos lucIa<br />
isdos no pai ■ pare <strong>de</strong>bater as choices emprega<strong>da</strong>s a atual estigio <strong>de</strong><br />
aeus labaratirios. Teremos um total do 19 palstras convi<strong>da</strong><strong>da</strong>s cobrindo as<br />
amplo espeetro quo vai <strong>da</strong> tipsiness mos mostradores <strong>de</strong> cristaie liquidos.<br />
A CO do SEEM caporal quo este encontro, coma aqueles quo o prece<strong>de</strong><br />
ram, posse 00000 ibuir pars in ardor lotercimblo entre vs pesquisadores e di<br />
continuido<strong>de</strong> u buses <strong>de</strong> Imo melbor orgaaixacio, sem inibir a informali<strong>da</strong><strong>de</strong><br />
dos discussion e fad' acesso a in 00000 io dos estu<strong>da</strong>ntes Co. pesquUsdores<br />
sail experientes.<br />
A COHISSA0 OICANIZADOR"
SIGLAS 00S GRUPOS DE TRABALHO<br />
AND = Materiels Amorros<br />
Aid 01:1c° c Molecular<br />
BIO a BioTIsics<br />
CRI = Cristalografla<br />
DEF Derellos, Cresclmento a Caracterizaceo <strong>de</strong> Cristais<br />
EST . <strong>Fisica</strong> Estatistica a FenOmenos Criticos<br />
INS . InstrumentacA0<br />
110 = Cristais Liouldos<br />
MAC . magnetism°<br />
MAT . Clavicle dos <strong>Materia</strong>ls/Proprie<strong>da</strong><strong>de</strong>s Medinicas<br />
MET = Metals a Lips<br />
071 . Otica<br />
RES . RessonAncia Magnetics<br />
SEM . Semicondutores
PROGRAMAcirt0 DAS ATIVIDADES<br />
DO X ENFMC
a.<br />
0<br />
PROGRAMAVIO DAS ATIVIDADES It ENFMC<br />
MORASS° QUANTA GUINTA SISTA<br />
(1:00 a 1,100<br />
to:ostorn<br />
COMUNICAGGES<br />
OE ST<br />
COIN rficoggigs<br />
OE ST<br />
CONUNICAOGES<br />
DE ST<br />
coowneogiles<br />
DE ST<br />
Y'<br />
CONUNICAGIIES<br />
DE ST<br />
comancogilis<br />
OE ST<br />
12:30e15:00 CILMOCO ALMOCO ALIVIOGCS<br />
91:00.15:00<br />
ATM: REM DTI T ;<br />
LIO- 01 - III EST IS<br />
ATMS ;OTIS:INS '19<br />
1110-CR110; SEE 14<br />
SEP GISMO: EOM<br />
16.11001t00 SEIM 1.10 20 ANDS: EST IS MO lis OTI II<br />
I2I0GI1:00 PAINEL PAINEL PAINEL<br />
oo:oo<br />
BTUS° ATUAL<br />
oo<br />
1.51.3<br />
ovouordio Dos<br />
WKS<br />
ASSENSLIIA
DISTRIBUICAO DE SALAS ENTRE OS GRUPOS DE TRABALMO<br />
Sala 44 Faira<br />
01 071 DTI<br />
54 falra<br />
_<br />
. .<br />
.<br />
64 ?efts<br />
OTI<br />
02 EST EST EST<br />
03 SEM SEM SEM<br />
04 ATO ATO ATO<br />
05 MET MET MET<br />
06 CRI CRI BID<br />
02 RIO LIQ -<br />
08 LIQ AMO AND<br />
09 MAT MAT MAT<br />
10 NAG MAC/RES RES<br />
11 OEF ou - .<br />
12 INS INS INS .
PALESTRAS COMIDADAS E MESAS REOONOAS<br />
PALESTRAS CONVIDADAS<br />
ATO 1. E.Lu<strong>de</strong>ne CIVIC) - Funcloneis <strong>de</strong> Densi<strong>da</strong><strong>de</strong><br />
ge feira, 14:00 horas - sale 04<br />
2. M.Trslc (IFOSCar) - FungOes <strong>de</strong> Base Universals<br />
5 ■ feira, 14:00 horas - sale 04<br />
ANO 5. E.Nessif (B.Aires) Determinaclo <strong>de</strong> 5(q) em Amorfos<br />
51 fairs, 15:00 hores - sale 08<br />
RES A. M.A.B.Aradjo (UFCE) - Ressonincia Magnetics <strong>de</strong> Haslet's Drientados<br />
e suns Aplicacbes ao magnetism°<br />
44 feira, 14:00 horas - sale 10<br />
O10 5. R.Ferrelra (UFPE) - Biogenese coma um Problems <strong>de</strong>.Fisice<br />
ds feira, 15:00 horas - sale 06<br />
OEF 6. N.A.Aegerter (IFOSCer) - Aerogeis<br />
ds feira, 14:00 horas - sale 11<br />
Oil 7. S.Cunha (UFRGS) - Espectroscopia Raman nlo Linear<br />
Al feira, 14:00 - sale 01<br />
8. J.R.R.Lelte (UFPE) - Conjugsclo <strong>de</strong> Feses<br />
5 ■ feira, 14:00 hares - sale 01<br />
9. H.M.Nussenzvelg (PUC/RJ) - Difraclo coma Tunelamento<br />
62 feira, 15:00 hores - sale 01<br />
BIO/- 10.G.Albertini - Olfraglio <strong>de</strong> Relax X em Cristals Liquldos e<br />
CRI Sistemas Bioldgicos<br />
34 ?gam 14:00 hares - sale 06<br />
▪ 11.H.d'Expert :Franca) - EXAFS a Cataliaadores<br />
CR1 AS feira, 14:00 hares - sale 08<br />
SEM - 12.G.E.Marques (UFSCer) - Estruturas EletrOnices em Heteroestruturas<br />
<strong>de</strong> Semicondutores Semimagneticos<br />
Al feira, 15:00 hares - sale 03<br />
13.Mese Redon<strong>da</strong> - Crescimento a Caracterizacilo <strong>de</strong> Semlcondutores: Re-<br />
centes Progressos no Pais<br />
▪ A.G.011veira (UFMG): J.R.Leite (IFUSP); M.N.G.Cervalho<br />
CAMP) e H.C.Basso (IFQSCar)<br />
62 feira, 14:00 hares - sale 03<br />
14.L.G.Ferreire (IFUSP) - Estetilli<strong>da</strong><strong>de</strong> <strong>de</strong> Ligas<br />
54 feira, 14:00 horns - sale 03<br />
EST - 16.F.C.Alcerez (UFSCar) - InveriAncia Conforms a Fenomenos CrIticos<br />
■ fairs, 14:00 horas - sale 02<br />
17.C.Tsellis (CBPF) - STATPHYS, a eels importante confer8ncia mum -<br />
dial <strong>de</strong> <strong>Fisica</strong> Estatistica: em 1989, no Brasil'<br />
6 2 feira, 14:00 hares - sale 02
18.Noung-An Chao ( ) - <strong>Fisica</strong> <strong>de</strong> Supercondutores i temperature<br />
Finite<br />
5s feira, 15:00 hares sale 01<br />
INS - 19.L.Oormaio (CNPq) - PANT a 0 Desenvolviaanto do Instruaentsclo<br />
no Brasil<br />
51 faire, 1A:00 hares - sale 12<br />
LIB - 20.A.P.Mmulans (UNICAMP) - Mostrsdores <strong>de</strong> Cristais Liquidos<br />
AA feint, 15:00 hares - sale OB<br />
MESAS REDONDAS PAOGAANADAS<br />
1. SEM 13<br />
2. Lip 21 - A Transiclo <strong>de</strong> rase Needtica-Isotropics em Liotr6piCOs<br />
Part.:- T.R.Teylor (UM): L.Q.do Amaral (IFUSP) a M.B.L.Santos<br />
(UFMG)<br />
5 ■ fairs, 16:30 hoses - sale 07<br />
3. LIQ 22 - Colest6ricos Llratropieos<br />
Pert.:- J.A.vanin (HIMP); A.N.FIgualredo.Neto (IFO(*) a M.E.<br />
m.Helene (IFUSP)<br />
6A faire, 16:30 Flores - sale 07
RESUMOS<br />
DOS<br />
TRABALHOS
NATERIRIS ANORFOS<br />
Coord.:- Reiko Sato Turtelli (UNICAW)
AM0/0:00/5A.F I NOVA TEONIA PARA DETERAINACAO DA MAGNETOSTRICCAO As POI AOTACAO DA<br />
NAIWIETIZACAD PON PEQUENOS ANCULOS. Aluineldo M.Se eeeeee e Frank P.Misaell (Depot-<br />
Lament° <strong>de</strong> <strong>Fisica</strong> do. Mat ' is a Metallic' do lostituto <strong>de</strong> F' ' <strong>de</strong> USP-CP 20516)<br />
Na izacio sag ' ' d " morfos. o estudo dos fe<br />
nomenos megnetosliticos e a <strong>de</strong>terminacio experimental d ■ magetostriccio As. sio<br />
<strong>de</strong> fun<strong>da</strong>mental importincia.<br />
Construtmos um equipmento para <strong>de</strong>terminer As. on<strong>de</strong> i uss<strong>da</strong> a ticnice<br />
<strong>de</strong> rotacio <strong>da</strong> magnetisacio por pequenos ingulos . - SAM1t. Este mikodo <strong>de</strong> ■edi<br />
d foi originslmete proposto por Narita et al.. bastant 0000 i oo 1 mosso para<br />
o valorem peq . slim <strong>de</strong> ter-se ■ vantages <strong>de</strong> podr ser utilimado indpn<strong>de</strong>nte<br />
sent. do sins! <strong>de</strong> As.<br />
Fi 'pima' modificacis no ['florid. Costs <strong>de</strong>ni es <strong>de</strong> ■edic's. <strong>de</strong><br />
mansir ■ a iocluir-se a p <strong>de</strong>s 0000 Oes int 00000 nas fita ■ dvido so process°<br />
-<br />
<strong>de</strong> lab ' - . dstas modificaciles, os efeitos <strong>de</strong> rel aaaa io <strong>de</strong>s<br />
int aaaaa por tratamento termicos po<strong>de</strong>a per acompsobados.<br />
Os resulted°. esperimentais Obeid°. pars aaaaaaaa toe tirmicos na<br />
liga <strong>de</strong> composisio Fe 8 ,11, 3 c Si, 5 C 2 silo muito hem reprodueidos por siaulacae<br />
usndo s equscoes <strong>da</strong> novi (Aorta. Para o caso do amostra ■ bsea<strong>da</strong>s on Co. cos<br />
As negative a pequena„ DO eft's°. <strong>de</strong> :dismay:rip nio podia ser examinados, pois no<br />
limit <strong>de</strong> As petitions as corretites introdusi<strong>da</strong>s sio <strong>de</strong>spreiveie. (CNPq, FAPESP e<br />
F1NEP).<br />
.AMO/542(1/*A.F I<br />
AFTEREFFECT <strong>da</strong> PERMEADILIOADE MAGNETIC* em LIGAS <strong>de</strong> FERRO-COOALTO .<br />
Absalr T. Rozen<strong>de</strong> Ratko S. Tortoni - IFGW - LINICAMP<br />
O aftereffect magnitico do dole grandpa 'twos <strong>de</strong> Ilgas amorfas i bum conhecido:<br />
o <strong>de</strong>s liges rice. em Cobalt° e o <strong>de</strong>s liias.ricas am Ferro. ambos apresentando<br />
um comportamento quadratic° em reface* magnatostricio. No sentido<br />
<strong>de</strong> comareen<strong>de</strong>r a transicio entre autos dol ■ grupos foram prepare<strong>de</strong>s amostra ■<br />
cos comousicio no forma (Co, s. Fe St icS,, - DixISO) a ofetua<strong>de</strong>s medi<strong>de</strong>s <strong>de</strong><br />
aftereffect e magnet:lats.U.06 di situf406 is temperature amblente.e do Nitro-<br />
ginio liquido.<br />
(0) Financlaon pole FAPESP<br />
AM0/8:40/5A F<br />
EFEITOS DAS c01l:n.0E5 DC FABRICKAO DAS FITAS FERROMAGIATICAS 30<br />
AFTER EFFECT DA PERMEADILIDADE MAGN2TICA<br />
Momotaro Imaisum1 a Ratko Sato Turtelli OFESCM - IFGW - UNICAPIP<br />
Foram feltas medl<strong>da</strong>a do after-effect <strong>da</strong> permaabili<strong>da</strong><strong>de</strong> magnitica corn virias<br />
vitas amorfns <strong>de</strong> Fe 40 41 40 13 24D 6 . produzi<strong>da</strong> cos voloci<strong>da</strong>dos <strong>de</strong> resfriamunto<br />
renteq, no Interval° comproondldo entre temporaturn anbionte e a temperature do<br />
Curie do material. Os resultados mnstrnm .Iue as intensI<strong>da</strong><strong>de</strong>s maxims do after-<br />
effect. a pr1175es <strong>de</strong>stn o valor Oa temperature' <strong>de</strong> Curie uatao ralaciona<strong>da</strong>s<br />
as conatTEges <strong>de</strong> fal,r1cacBo <strong>de</strong>uens titan.
An/ 9 : 00 / 59 -F IORDEM DE CURTO ALCANCE NO SISTEMA AMORFO NhxSni_ x . Val<strong>de</strong>ree Drexel<br />
(Dept°. <strong>Fisica</strong>. Unlverai<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa Catarina) a Elias B.SaitoVitch(Centro<br />
Braeilelro <strong>de</strong> Perm:minas Melees).<br />
Apreaentemos um eetudo eletemitico a in situ por EapectrOecopla Plaaabauer<br />
119Sn do eietema amorfo NnOni.x (0.09 4 x d 0.95) obtido pelo conga/anent° do va<br />
por.<br />
A comparegio dos veloree do <strong>de</strong>elocamento isomeric° a do <strong>de</strong>edobramento quadrupolar<br />
em direrentee concentragaeii com oc valores <strong>de</strong>s cOrreepOn<strong>de</strong>ntee fares inter<br />
metilleas. augere a eel:sancta <strong>de</strong> uma or<strong>de</strong>m <strong>de</strong> curto aleance semelhanee aquela<br />
que se estabelece nee correapon<strong>de</strong>ntec faints criatalinae.<br />
AM0/9:20/5A.F I DENSIDADES DR ESTADOS Ca o - Zr Co<br />
Sandra Pereira, Jayne D Jr. Sonia Frota-Peseaa (Inatite-<br />
io <strong>de</strong> lisle. <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo).<br />
Nos Ultimo ■ anon d Iveu-se um esquema simples bagged° no meted° <strong>de</strong> re<br />
in ■ iled° a um. Hamiltonian. LCAO paramtriaa<strong>da</strong>. pars stu<strong>da</strong>r estretera<br />
el rrr a r ica em metals <strong>de</strong> transicio.<br />
Ease esquema fol used*, ailed° i uma paramtclaacio bastente simples wi<strong>de</strong><br />
a bibridiascio sd a <strong>de</strong>:pre:ads. pore obter <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> "sta<strong>de</strong>s d em liens<br />
smarten <strong>de</strong> a - Cret e a - ZrCu a - Zr?.. Neste trabalho completimos ■ aerie<br />
calculendo a <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> estados pare a - ZrCo a comparamos nom. cilculos<br />
com resultados experimental. existents.. R manta Foi <strong>de</strong>senvolvi<strong>da</strong> vas<br />
parametrixacio main quantitative baseads na 1,1410. Apresentaremos resulted°s pa<br />
ra o 0 ZrCo com ■ nova parsmetrialicio ■ a fin <strong>de</strong> comparer cos os resulted°.<br />
ie.--<br />
AM0/9:110/5A F RES1ST1linuMa =MICA DA LLGA MOWS Pe. ..-. Zr .. P.P<br />
7 6. Ili<br />
.<br />
'<br />
W.R.Schrei<br />
V MI<br />
nor J.V.lunaler - Institute <strong>de</strong> Flaica - uracs<br />
D.N.Ryan a J.M.D.Coey - University of Dublin. Trinity College<br />
Redid.. <strong>de</strong> re.i.tivi<strong>da</strong><strong>de</strong> elitrica utiliaando use ticnica AC <strong>de</strong> alt. precisio<br />
■io efetua<strong>da</strong>s numa lige amorfa <strong>de</strong> F. . 2 - Zrn nn entre 2.5 K e 300 K. Os resulta<br />
dos revelam peculiari<strong>da</strong><strong>de</strong>s relacional/1i ao esTilla magnetic° <strong>da</strong> smostra. As lige.<br />
amorfas Fe-Kr, s ■ altar concentreciie ■ <strong>de</strong> F., mostram m ■ corset rr i rr ices incite.dos<br />
'listens' magnetic°. reen . Z. particular. a p to amostra ■ o-<br />
fre uma icio <strong>de</strong> fame paramagnirica-ferrumagaitica gm 100 2. so place que ea<br />
temp rrrr inferiores a 100 K eta passe a ap ter proprie<strong>da</strong><strong>de</strong> ■ magnetic. ■ ir<br />
is proprias <strong>de</strong> um estado do tip° vidro-<strong>de</strong>-spin.<br />
Um ■ anilise <strong>de</strong>tallind ■ d ■ reeistivi<strong>da</strong><strong>de</strong> a <strong>de</strong> ■ ea <strong>de</strong>rived. proximo a T. permits<br />
■ <strong>de</strong>terminseio do expoente critic° a. 0 valor <strong>de</strong>termined° isteml difere<br />
significetivamente dos valorem normalmente encontrados nos istema ■ f guiti-<br />
cos colineares. son<strong>de</strong><br />
te cam os ezpoentes caracteristicos do sus<br />
ceptibilldm<strong>de</strong> e dm nag ' - . Os remultadon nimbi. ■ ugerem que as fluteacae ■<br />
m rrr i r icas rrrr i eee domino= a re e i ee ivids<strong>de</strong> num grand. totemio <strong>de</strong> temperatu-<br />
✓e aches <strong>de</strong> T . Estes c rrrrrrr i r tices po<strong>de</strong>m air indicative's <strong>de</strong> algumse dif rr s<br />
ini ■ eare a fase ferromagnetic" <strong>de</strong> um sistema reentrante e o ferromegnetis<br />
mo colinmr ordinirio.
Am.=<br />
AM0110:15/517TESTADOS LOCAL/EADOS NUMA REDE DE BETIIE DESORDENADA. Jose Ernesto<br />
TiWIInetituto <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Univerei<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral Fluminenee).<br />
Utilizandn a representayea <strong>da</strong> mettle <strong>de</strong> transferencia em forma <strong>de</strong> freers° con<br />
tinue calculamos por simulacao numerics o reit', <strong>de</strong> convergencia <strong>da</strong> =lama em fudge5<br />
<strong>da</strong> <strong>de</strong>sor<strong>de</strong>m diagonal pare um mo<strong>de</strong>lo tipo An<strong>de</strong>rson. Esse valor <strong>da</strong> energia gue.separe<br />
astados localisados <strong>de</strong> estados astendi<strong>da</strong>s permits estabelecer um criteria <strong>de</strong><br />
bor<strong>da</strong> <strong>de</strong> mobili<strong>da</strong><strong>de</strong> qua coinci<strong>de</strong> parcialmente cam mo<strong>de</strong>los teericas a com cAlculos<br />
numdricos <strong>da</strong> condutivi<strong>da</strong><strong>de</strong>. 0 metodo i eatendido a. outroa tipos <strong>de</strong> ro<strong>de</strong>o.<br />
AM0/10:35/5A.F<br />
NuCLEAcA0 AD1ABATICA APLICADA A eiTINEROS E VIDBOS. liaise<br />
SLIverrs e Erich Meyer - Institut° <strong>de</strong> <strong>Fisica</strong> -<br />
0 mo<strong>de</strong>lo <strong>de</strong> nucleacio adiab" r 000000 mince <strong>de</strong>senvolvido par E.Meyer,<br />
site sendo usado pare<br />
.<br />
calcular os Unice, <strong>de</strong> estsbili<strong>da</strong><strong>de</strong> perm Ease lieui<strong>da</strong> su<br />
per-miria<strong>de</strong> <strong>de</strong> polimeros s vidros carisicos. Neste eilculo vem seado<br />
usa<strong>da</strong> um ■ aproximagio mais realistic& pars a calor !specific° <strong>de</strong>s fasts. ou ■ eja,<br />
introdusi<strong>da</strong> a dspen<strong>de</strong>ncia cos a temp <strong>de</strong> um ajuate polimomioal <strong>de</strong><br />
segued. °rase. Resulted°s preliminares pare os polineros vem <strong>de</strong>monotrendo con<br />
sisteucia do mo<strong>de</strong>lo, cujas prevision pare o caso dos vidra ■ carimicos serio dlacu<br />
ti<strong>de</strong>s.<br />
AMQ/1055/5A.F f TRAUSIE1ITE DE CORRELATE Er.g7nw.n EN AMETEK.' DE PVDF DCV/DO A AGUA<br />
DE VOLUME. Neel Alums - Depto.Ciencias Amientals-IPCAPP/IR/MP-Prev.Pre<strong>de</strong>nte;<br />
Roberto Masking& Feria: - Dcpto. <strong>de</strong> ['Lulea a Clincia dns <strong>Materia</strong>ls- Insc-unrisiv<br />
Carlos-SP.<br />
Uma condutivi<strong>da</strong><strong>de</strong> evanescent°, <strong>de</strong>pen<strong>de</strong>nts do temp°, tem ai<strong>de</strong> <strong>de</strong>tected° nos<br />
filmes <strong>de</strong> PVDr <strong>da</strong> Bamberg Felten. Ape'. Mites ciclos <strong>de</strong> polarisergio a <strong>de</strong>spnlarimagic,<br />
a corronte <strong>de</strong> absersio terns -se forterente redusi<strong>da</strong>. pare o menu nivel<br />
<strong>de</strong>s correntos <strong>de</strong> <strong>de</strong>spolarizacio. Este condutivi<strong>da</strong><strong>de</strong> a facilmente Observa<strong>da</strong>. spa<br />
recendo na corrente <strong>de</strong> pelaritecio ;role anlicaceo <strong>de</strong> altos camros. C observed° -<br />
recupereveo em amcstras <strong>de</strong>laa<strong>da</strong>s are atmosfera emi<strong>da</strong>. Ues interpretames etas ob<br />
servacies come nerd° uma limpeza, pelo cameo eletrico. doe 10011 gorodom nor urn<br />
acentuacio <strong>da</strong> diseaciaqeo <strong>de</strong> molecules <strong>de</strong> igua absorvi<strong>da</strong> no volume. pale acia <strong>de</strong>s<br />
to campe.
AM0/11:15,5A.Fi MEDIDAS ISOTERMICAS EM FILMES DE PVDF<br />
Autores Alfredo Jorge e Roberto Mendonca Feria (UFMT-Cbi-lfr e 1FQ§C-USP-Sio Carlo<br />
Este trabalho consistlu basicamente no estudd <strong>de</strong>s proprie<strong>da</strong><strong>de</strong>s eletricas <strong>de</strong> filmes<br />
<strong>de</strong> PVDF fase Alfa febricado pela Bemberg Mien Co.<br />
Dentre as ticnicas utiliza<strong>da</strong>s nests trabelho, <strong>de</strong>stacamos aqui as medi<strong>da</strong>s isotirmicas<br />
corn inversOes <strong>de</strong> campo elitrico. on<strong>de</strong> nos foi possfvei <strong>de</strong>tectar a influincia<br />
<strong>de</strong> umi<strong>da</strong><strong>de</strong> na dunducio superficial dos filmes <strong>de</strong> PVDF no sus Ease Alfa. Aplicsmos<br />
numa 'mows com eletrados ea ambos os lados . sem anal <strong>de</strong>guards. um campo eletri<br />
co <strong>de</strong> 200 KY/cm a quando sua corrente <strong>de</strong> carg ■ ou absorcao dieletrica se tornou<br />
quase estecioniria. fizemos a inversio .do mesmo a observamos entio a presence <strong>de</strong><br />
um pica <strong>de</strong> corrente. que se repetiu epos cads inversao. Pere este casco. utilizamos<br />
temperature a umi<strong>da</strong><strong>de</strong> embiente. Km ambiences seco(silice-gel), vim,. temperature<br />
<strong>de</strong> IBM ou a temperature ambience a umi<strong>da</strong><strong>de</strong> ambience pores com anal <strong>de</strong> guards he<br />
amostra. as picos <strong>de</strong> corrente nao foram mais observados. Medi<strong>da</strong>s auxiliares foram<br />
realiza<strong>da</strong>s com o objetivo <strong>de</strong> verificar injegio <strong>de</strong> carps no interior <strong>da</strong> amostra pelos<br />
eletrados. Os resultados mostraram um comportamento proximo do ohmico nas curvas<br />
I versus V. indlcando a nio injecio.<br />
AM0/11:35/5A.F 1 ESPECTROSCOPIA FOTOACOSTICA EN IONS lerriLICOS DOPADOS EM VIDEO.<br />
Gilson A.R.Lims. N.Varsas. M.L.S . E.C.<strong>da</strong> Silva (Inatieuto <strong>de</strong> <strong>Fisica</strong>-UNIX/MP)<br />
A possibili<strong>da</strong><strong>de</strong> do use ds ticale ■ do esparagie dos 'spectres no Ease. a ems Ersquinela<br />
i proposed come elated° ds eseelocio do s 000000 o ds ea<strong>da</strong> comp<br />
em um ■ matrix composts. Usasdo amostra so<strong>da</strong>-lies silica (vi<strong>de</strong>o) dimads com mists<br />
rem do Co0-Cr0 3 s CuO-Cr0 3 os 'sperms resistrsdos sea° ds *cord° come equals.<br />
obtidos emend° me Unice asi<strong>de</strong> i posto os motels. Tomball ems estimative do tempo<br />
<strong>de</strong> relssasio titmice nix radio:Mime pods ear obtido pore ca<strong>da</strong> compoosote. .
----<br />
11240/10:15/6A.F F-7DIARAMADE FASES MAGNETICS ND SISTENA Ammo S Mn.<br />
n100-x<br />
Dra V., e E. Magic) Saitovitch (Centro Orasileiro <strong>de</strong> Peaguisas<br />
s cas <strong>da</strong> Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa Catarina).<br />
0 sister= amorfo SnMn foi produzido sob a forma <strong>de</strong> filmes tins, Ror liongelamento<br />
<strong>de</strong> vapor em um substrata <strong>de</strong> quartz° a 20k, na faixa <strong>de</strong> concentragao <strong>de</strong> 9 a 95% at.<br />
<strong>de</strong> manganes. Com base em medi<strong>da</strong>s in situ, !altos por Bspectroscopla Peossbauer /<br />
(E1i1119Sn a reslstivi<strong>da</strong><strong>de</strong> 711617aa'-3.c., a os resultados <strong>de</strong> referencia I foi posed<br />
vel propor o diagrams <strong>de</strong> Eases maga-Mass em Euncio <strong>de</strong> concentragio dos Mn. Esti<br />
dlagrama envolve uma face vidro <strong>de</strong> SpAB ix < 60), uma farm mists (60 c x < 851. uma<br />
fame anferromagnetica -11-
ANO/11:15/6A.F il REMO DE RELAXACAO ESTRUTURAL EM FERROMACNETOS ANORPOS. Ismael<br />
Alarcon, Marco S.Lant ttttt a. Antonio D.Santos sFrankli.Missell-(Dept9 <strong>de</strong> iri117<br />
Tii-Faiergats a Meanies do IFUSP - CP. 20.5167.<br />
Emma. realiaan<strong>de</strong> @stud°. do efeito <strong>de</strong> tratamentos titmicee sabre as pr2<br />
prie<strong>da</strong><strong>de</strong>s magni t i ttt <strong>da</strong>m ligas amorfas <strong>de</strong> composicia Cos5Fe2oSi15B ie , Co70,4Fe 6.6<br />
Si<br />
15 3<br />
10 o Co 75 511511 1 m.<br />
Medidss di cairn, coercive He e energia <strong>de</strong> anisotropi ■ elegies Keff foram<br />
realised mo ttttt nio trata<strong>da</strong> ■ a gals tratmmentos tirmicos no ttt tt im <strong>de</strong><br />
campos magniticos. As medi<strong>da</strong>s foram faits ■ a temper aaaaa ambiente, spas o material<br />
ter sido tratado per 2 horas a tempo lvamente aaaaa antes. <strong>de</strong>s<strong>de</strong><br />
100°C ati 425 °C.<br />
O efeiro do trot aaaaaa tirmico i bestante intenso, sendo quo na fit. <strong>de</strong><br />
Co70 . 4Fe4.6 Si i ,11, 0 obtivemos. moils o tratamento 250°C, He % 20 Koff n<br />
10 oozes supeffoles ■os c aaaaa pon<strong>de</strong>ntes valores para a amomtra nio ds, enquan<br />
to qua epos a tratamento ■ 325°C aaaaa agitate. a ■ er iguais go ■ obtidos para a<br />
<strong>da</strong>.<br />
.<br />
Eaten resultados po<strong>de</strong> ■ ■ oar entendido ■ em torsos <strong>de</strong> um mo<strong>de</strong>lo ands<br />
cies no anisotropismagni t tt results. am contribuicOes ao campo coercive Rc. Um<br />
tratamento tirmico abaixo dm temp do Curie results.no or<strong>de</strong>nsmonto <strong>de</strong> pates<br />
<strong>de</strong> itomo ■ magnitieos a a crlscio <strong>de</strong> um. ■ nimotropia induai<strong>da</strong>. resultando num lumen<br />
to em He. Acim ■ <strong>de</strong> Te. um tratamento tirmien <strong>de</strong>sor<strong>de</strong>na os pares ■ timicos.<br />
nando feitos. A cinitica dos or<strong>de</strong>namento ■ atomicos seri estu<strong>da</strong>d ■ para forttttt<br />
tempos <strong>de</strong> relamstio ca rrrrrr i r tie°. do. p<br />
Trabelho patrocinado polo Mg, FAPESP a FINEP.<br />
4140/ 11 : 35/614 F/ SWIM DE MATESIAIS KAGNErICOS A PARTIR DA TERKUISE DR STORMS-<br />
SAIS DE FERRO (III) AMORFOS. Norco Iacovscei. Edson C <strong>da</strong> Silva, Helton Vargas.<br />
(Institut° <strong>de</strong> <strong>Fisica</strong>, Eduardo A. Pinheiro s 7 do Galembeck t Institute <strong>de</strong> Quimi<br />
ca - UNICAMP.<br />
Poe rrrr &lime <strong>de</strong> hidrolossais <strong>de</strong> Ferro i possivel sintetisar magnetics e sugimmits.<br />
Por medi<strong>da</strong>s <strong>de</strong> Re rrrr i r cia Magnitica KletranLea tem sido p " I monitorsr BO<br />
transformacies quo o rrrrr m eeeee p qua■ envolvem 'mint°, coals -<br />
cia. e lisagio orientacio magnitica. Iledi<strong>da</strong>s <strong>de</strong> Raio ■ I e Aniline quimic ■<br />
permicem c eeeeee riser on produtos finals. Medi<strong>da</strong>s em !faits F - mica permItam<br />
a obtengio <strong>de</strong> proprie<strong>da</strong>dss apticas a tirmioas dos materials. Em particular procu-<br />
ramps astabolecsr um mo<strong>da</strong>lo teiirice lisando as Lammas <strong>de</strong> linba <strong>de</strong> IRE, a in-<br />
tensi<strong>da</strong>ds do sisal Setae:rate°, cos as temanho ■ due p " la no p . ■<br />
eeee tecnica ■ etamo estabelcendo uma sistemitica as elutes. dos ■ ' is ms-<br />
gniticos nvolvendo hidramido, hid do. hLd lorato e hidromoloafato dm<br />
Ferro III amerfes.
s<br />
FISICA ATOMICA E MOLECULAR<br />
Coord.:- Sylvia Canuto (UFPE)
A10/0:00/4A.F EfpALHAMENTO INELASTIC° DE ELETRONS POR ATOMOS DE MACNESIO: ESTUI10<br />
DAS EIMATAciES 3 1 P c 3 3 P. - Cellar Jose llonjuani Pagan! Gild. Dalcanale Me eeeee r<br />
Luiz Eugenio Mschado" ( "- UNICAMP, 1FCW: 4 - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Sao Carlos)<br />
A Tootle <strong>de</strong> Minos Corpos em Primeira Or<strong>de</strong>m foi utilized. pace cal -cuter as<br />
SectOes <strong>de</strong> Cheque Diferencial (SCO) e Integral (SCI) pare o impacto el eee ;nice com<br />
um alvo <strong>de</strong> Mg inicialmente no estado funds e 1,para teeitaceo dos estados 3 1 P e<br />
3IP, pp. ■ as energies do etetron inci<strong>de</strong>nt. <strong>de</strong> 101 20. 30, a% 50 e 100 eV. Pare s<br />
tranmitso optiramenee permiti<strong>de</strong>, calculamos tambim as peremetros <strong>de</strong> experiincia <strong>de</strong><br />
coincidincie el -(Oton I. z ou Y. cl.2.<br />
Ns Teoria Utiliza<strong>da</strong> o potential <strong>de</strong> transigeo a do tipo static-exchange, ■ -le-<br />
ver em cones qusiquer efelto <strong>de</strong> correlate° at polarizes:1o. Os orbitai ■ ligados do<br />
alvo foram obtidos na aproximageo II -Pock (HF) pare o estado fun<strong>da</strong>mental e<br />
porn estado excited°. HF <strong>de</strong> earogo congelado. Os orbi ' do continuo tembim fo-<br />
ram calcoIadoe no ■pron:image° HP.<br />
Os resultados obtidos concords. <strong>de</strong> meneira geral muito been com o experiment°.<br />
0 aaaaaa mos qua as SCD pare a excitaceo do estado 3 .1 P celeuta<strong>da</strong>i possuem pontos <strong>de</strong><br />
maximo e minima qua concor<strong>da</strong>m .uiro bem co. o expari pare insult' ■ pequeno ■<br />
as aaaaaa teOrica ■ ficam completamente <strong>de</strong>ntro do <strong>de</strong>svio experimental estimedo conforms<br />
s energie (apexes do ereito <strong>de</strong> polarizsgeo). Os parametros <strong>de</strong> experi-<br />
allele <strong>de</strong> roinci<strong>de</strong>ncie tambim <strong>de</strong>m com os eli<strong>de</strong>s experi . Obti aaaaa tam<br />
bim uma boa c aaaaa <strong>de</strong>nci pare a excitecio do ma<strong>de</strong> 3 3 P.<br />
Ar0/6:20/4A.F 1 ESPALHAMENTO DE ELiTRONS OF OAIXA MERU!. POR MOLECULAS POL/ATONICAS. Pedro F.<br />
T Luit E. Machado.. . Marco A.A. e Luiz M. BrescansIn' Is Unicamp, Cempinns. SP:<br />
UFSCar„ Sip Carlos. SP: ..o lEAv. Sao Jose don Campos. SP)<br />
Neste trebelho.sp<br />
morn os resultados parcinis do espelhamento elestico <strong>de</strong> e1e -<br />
trona pole molecule M2S, utilleando o Netodo <strong>de</strong> SchwInger Vault:clonal'. Ate recentemente uinha men-<br />
do spliced° epenes a mliculas lineares, mss rot extendldo2 pare po<strong>de</strong>r celcular seegies <strong>de</strong> choque<br />
<strong>de</strong> eletrons par molecules pollute:<strong>de</strong>m cos simetrIas C 2v . D 2h' etc. Sempre qua possivel, compare-<br />
mos noncom resulted°s com <strong>da</strong>dos experimentals dleponivels.<br />
1. R.R. Luechese. D.K. Watson end V. NeKoy, Phys. Rev. A22. 421 (1980).<br />
2. Lull E. Machado. Marco A.P. Lima and V. McKay. on preparageo.<br />
1110 ,8: 4 0/ 4 A.F EFEITOS DO SPIN EM EXPERIENCIA DE COINCIDDIC1A ELETRON-FOTON. Per-<br />
:undo J. do. Peneo, institute <strong>de</strong> <strong>Fisica</strong> - UNICAMP.<br />
Apresentaremos a aniline <strong>de</strong> sxperie ncia <strong>de</strong> Coieci<strong>de</strong>ncia Eletron-Fiton <strong>de</strong><br />
ums meneira qua resalta a infl do spin do eletron. Como este ■ experiencias<br />
seo realize<strong>de</strong>a com reise <strong>de</strong> eletrons Lao polarizados, ou neje 0 rene <strong>de</strong> eletron ■<br />
inc eeeeeee no qua die respeito ao spin, este e 0 veep - 1 pela is <strong>da</strong><br />
experiincia. Verso ■ mo rrrrr em qua condiciem rr i eee a " ferencia" <strong>de</strong> incoerin-<br />
cia do raise <strong>de</strong> el eeeeee pare a exp e in atravis do aniline <strong>de</strong> tres wog be ■<br />
distintos, He, Kr e Na. Sete enilise nom permits p r qua informacie ■ adicionais<br />
pod ee obter se a experienria for re:all:ad ■ com eletron ■ polerixedos i .<br />
(1) J.J. McClelland. M.H. Kelly e R.J. Callota, Phys. Rev. Lett, 55. 688 (1985) e<br />
Phys. Rev. Lett. 56, 1362 (1986)
ATO/900/4A F I FOTOIORIZACAO DC MOLtCULAS POLIATINICAS. Eduardo kirands', Luis C. Machado''.<br />
Marco A.P. Lino"' a Luis N. Brescansin s 1' Unitise. Complain. SP; " UFSCar, Sao Carlos, SP;<br />
ea, ISA.. Sao Jos; dos Campos, SP).<br />
Ate recentemente. o Mitodo <strong>de</strong> Schwiniter Pori/atoned' vlydte sendo aplicado tom sucesno<br />
pare o estudo <strong>de</strong> seccaes <strong>de</strong> cheque <strong>de</strong> fotoioninagio <strong>de</strong> molecule. linear... Foi,<br />
do, pars po<strong>de</strong>r sir utilized° pars o cilculo <strong>de</strong> fotoionitscio <strong>de</strong> molecules poliatandcas 2 cos simetries<br />
C2v. D2h , etc. Neste trobalho. spresentamos os resultados parciais <strong>de</strong> seccOes <strong>de</strong> cheque <strong>de</strong><br />
fotoionizacio <strong>de</strong> NO. pare os canals Al, SI e 02 e compares°, nooses resulted°. cos outrun disponi<br />
vets no literature.<br />
1. R.R. Lucchese and V. Mickey, Phys. Rev. A2 4 . 770 (1981).<br />
2. Luis E. Machado. :twee A.P. Lisa and V. Many. em preparscie.<br />
1joig.200A.715101ARIzACAO DE SPIN NO ESPILMAVINTO INELASTIC° DR MATRONS TOR ATO<br />
NOS: 0 trim° SPIN-ORSITA NAS TKANSICOKS 3-S*3'11... 2 DO ATONO OE NEONIO. N.C.C .<br />
Ferro: MosejUPS), L.Z. Machado, E.P.Leal IDFAffiar) a G.D. Mantises WM/ -<br />
cra —TT P.<br />
Foi mostrado per Hanne(Phys.Rep.95, 95(198111 que a excitacio <strong>de</strong> Atoms por<br />
impact° eletranico pods lever a efeitos <strong>de</strong> polarisacio <strong>de</strong> spin quondo o astado ex<br />
citado quebra s regra,do mcoplamento LS(6 efeito spin-htbita,cf.Hanne).Este<br />
caso dos excitacoes 211-.203s do Ne, cujos estados sequem o memo asquema <strong>de</strong> aco -<br />
plamento Intermediirio(COwan and Andrew, J.Opt.Soc.Am.55, 502(196511. Para esta ■<br />
transLcoss e corn um &axe inci<strong>de</strong>nts nio polarisado, po<strong>de</strong>mos calcular uma fungi° <strong>de</strong><br />
polariaacio <strong>de</strong> spin<br />
N1- N 4<br />
S<br />
i NI<br />
cru<strong>de</strong> u<strong>de</strong> MONO o nu <strong>de</strong> elitrons cos c spin paralelolantiparalelo) i normal ao<br />
piano <strong>de</strong> espalhamanto. N4 a Ne sio funciies dos momenta K e K' doe elitrone inci<strong>de</strong>n<br />
to a espalhado, respectivamanta.<br />
Estamomutilisando a Teoria <strong>de</strong> Muitos Corpos em Frimeira Or<strong>de</strong>n: (F0111121. .cOmo<br />
proposto porCsanak et AllPnya.Rev.A3.1322(1971))para calcular a funcgo<br />
<strong>da</strong>le tranaicoes3 1841 31,0,1.2 do tie. Tatra energies do elittron inci<strong>de</strong>nt. entree 20<br />
100 .V.Embora nio haja valorem experimentsis diaponiveis,existem cilculos samalha<br />
tea pars itomos <strong>de</strong> He(Csanak and Cartwrigth,aubmetido J.Phye.8(19116)). Hg (Baste -<br />
chat and Madison;submetido J.Phys.8(1986)1 Mg(Meneses at al, ■ubmetido J.Phys.11<br />
(198711.<br />
ATI1/9-a0/4A.F ISIMULA00 DR MOPIRROS GRANDES 8 PRQUILMOS NOS PROGRAMAS DR COMPUTADO<br />
01 44r J 046 24nivanl Pagan IFGV Universi<strong>da</strong><strong>de</strong> Estadual <strong>de</strong> Campine.<br />
Subrotinss que simulam o 6 000 os gran<strong>de</strong>e ou peg forms construf<strong>da</strong>s pars .<br />
suites problemas is mitoses ends os limit.. - ices nao ■etisfasem as 0000000 i-<br />
<strong>da</strong><strong>de</strong>s do cilculo 'fico.<br />
Os niimeree reale sio substituidos per pares As o mmm os <strong>de</strong> que os ne-<br />
ves limItes aumericos passim a air <strong>de</strong> 10 n , 10 n on<strong>de</strong> n e o major inteire permitid<br />
maim um. As ■ ubrotines <strong>de</strong> simulegio fane ■ as operagOes_<strong>de</strong> soma e subtragio (SOMA)<br />
multiplicecio (MULTIp) divisio (Dlvi), a eeponenciacao (UPS). Sio substitui<strong>da</strong>s<br />
na parte do prosrama<strong>de</strong> computador pu<strong>de</strong> acorns problemsa r nnnnnnn do facilmente<br />
programacao usual en meg:Ai<strong>da</strong>.<br />
Cates subrotinas foram utilised.' cos pole Grupo <strong>de</strong> <strong>Fisica</strong> Atimica<br />
Molecular do 12011 d ■ UNICAMP, pars calcular os orbitals <strong>de</strong> espalhamento do al.*<br />
<strong>de</strong> MI, ■ no cilculo <strong>de</strong>s integrals <strong>de</strong> dole eletrons <strong>de</strong> Slater pars obtencio <strong>de</strong>s<br />
Sacco.. <strong>de</strong> Cheque Dif Isis do Ms, po<strong>de</strong>ndo ser usa<strong>da</strong>s pare resolver qualquer<br />
micro problems <strong>de</strong> aumeros gran<strong>de</strong>e ou peg , impossivele <strong>de</strong> ■ er ■ imbolizedo ■ pe<br />
to coeputador utilia.do.
▪<br />
A10/10:15/4A.F ESTUDO SIST1944S 1NTEG1AVEIS BIDINENSIONAIS CON 1NVARIANTES QUARTICOS<br />
Marcus Werner Mims a Jason Alfredo Carlson Galles,<br />
Defertamento <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFSC, 88049 Florian5polis.<br />
Estu<strong>da</strong>mos sistemms dinimices bidimensionais hamiltonianos cu nio que admitem<br />
invariantes polinamiais quarticos nos rammeata. Partin<strong>de</strong> <strong>da</strong> forma Frei pare in inveriante <strong>de</strong> or<strong>de</strong>m<br />
e nos momenta<br />
l(p AO') ■ x y<br />
/ ac ( IIY) Pi Pi<br />
ix0 jx0 x y<br />
irjSn<br />
abteams in conjunto <strong>de</strong> 21 equacoes diferenciais ferciais pare os 0. que expressa a condicio<br />
necessirla a suTiciente pare ser invariente. Para t4sistemas hamiltanianos<br />
. V(va) oiconjunto <strong>de</strong> evanges diferenciols parcicis a formado <strong>de</strong> doffs<br />
subeanjuntos<br />
<strong>de</strong> elluaeoes, in (10 etipacoes) envolvendo os m„ e a vatencial e o autro (11 equacoes:<br />
envelvendo samente as a... Apresentamos solucies gerais parVeste ultimo conjunto barn can resultados<br />
especificos para lJo huniltoniano <strong>de</strong> Henon.11eiles, V(x.y) i(Ax 2 rBy 2 ) 4 Cey - IDyi .<br />
AM/10'35/4A F 1 UMDADEIU: M7744SISTEMSCRONTICOS<br />
(Parcialnente financiadozlo Q1Pq,CAPES a FlhEP)<br />
Fernando Cabral a Jason Alfredo Carlson Dallas,<br />
Departamente <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFSC, 88049 Florinnipolis.<br />
Neste trabalho mostramms que a ji conheci<strong>da</strong> trensformacio dual que conecta<br />
sistemes hamiltenianos integrivels clissicos em dues dimenm5es po<strong>de</strong> sir estabeleci<strong>da</strong> em N dimensoft<br />
a partir <strong>de</strong> um formulacno quintica do problema.<br />
(Parciabacnte financiado polo CNPq,CAPES a MEP)<br />
ATI:I/10:55/4,1.F<br />
QUANTIKACM) oe nvemium PELO MIT= OA mom% DE TR/UW*11A.<br />
BIN KANG CHENG (Empartamento <strong>de</strong> <strong>Fisica</strong>. universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Parana)<br />
mania a transformacio <strong>de</strong> Kusteanheim-Stieel e e substituipie do tempo nova, causes metamente<br />
a fungi <strong>de</strong> Green <strong>de</strong> dyo:miumaom La;ran)eana<br />
At) .ierqt Ail al. 11(t).(dr-y1)(11 - (a/r)] /Dry - z2))<br />
on<strong>de</strong>: q e<br />
1 3<br />
2 - e2<br />
3<br />
1 , -(0 182 4 302 ) a e i e g i sio respectivmnemte, as cargas etetricas<br />
e mageniticas <strong>da</strong> particula I. EM seguidn, calculamos aumafungiies a as autovalores <strong>da</strong> margin.<br />
expandindo a Eungio <strong>de</strong> Green ami<strong>de</strong>.
ATO/11:15/4A.F1<br />
'ESTAOLIS ESTACIONARIOS OE OUAS PARTICULAS OE OIRAC EM UM CENTRO COULOMBIANO"-Jor-<br />
Bs Futoard Yamamoto Au %pito Aostinho Nato - Institute <strong>de</strong> Plaice USP<br />
--X-Wipoote e trees no 'meet ger op nivei tie norglii <strong>de</strong> um itomo <strong>de</strong> dual<br />
earticula. (m particular. N e Hu-muonleal atrevis <strong>de</strong> uma gamittoniane fanomenolosica.<br />
P <strong>de</strong>mo. obtor uma =iac i° 011Bit/ries <strong>de</strong> Outavalor ■ par intermit:fie <strong>de</strong>lete<br />
oamiltoniena creative g <strong>da</strong> vp 0e fungi° <strong>de</strong> ends gm produtos almatrizedo dirotas<br />
<strong>de</strong> um conJunto complete <strong>de</strong> fungous <strong>de</strong> uma partIcule. 0 ',Wetly° é dome rrrrr<br />
@flattop do corralegeo afaitos rlativietioos. E inmate. a. chimed'. corns -<br />
■ po<strong>da</strong>m gar enalisa<strong>da</strong>..<br />
yoga radiative<br />
ATOM:35/411.F IALIGNMENT IN RESSONANT PHOTOIONIZATION OF HELIUM ATOMS - Jose<br />
Eduardo Martimbo Homes - IFQSC/USP<br />
The bombar<strong>de</strong>ment of atomic Helium by vacum-uv photons causes the ressonant ionization<br />
of the system and consequently the alignement of the Heliun ions produced<br />
in the reation. The Schrodinger equation for the three body system in the continuo<br />
is solved based. In the use of hyperspbericel coordinates for the six-dimensional<br />
Hamiltonian. First potential,curves and analytical channel functions on<br />
the variables e,.43, ,p, 4 2 . _ - ple o rar2 are obtained. Finally radial aqua -<br />
tions on the vatianle R ■ Irr, are numerically solved, precise wave functions<br />
are obtained and the alignement - tensor is sucessifully calculated. Comparetion<br />
with experiments are now possible and in progress.<br />
ATO/1 1 :33/eit.F1 OPTIMIZATION BY ANNEALING IN ATOMIC PHYSICS: AN UNIFIED DESCRIP-<br />
TION OF LIGHT ATOMS BELLOW THE MULTIPLE IONIZATION THRESHOLD -<br />
Jose Eduardo Martinho Hornos - IFQSCillEP<br />
Spherical coordinates In 3N dimentions provi<strong>de</strong>s the natural frame work for the<br />
analysis of the N body Coulomb system. It also allow one to naturally <strong>de</strong>couple<br />
the problem in two steps. first potential curves are obtained and then radial<br />
equations solved. This technique has been implemented for two-electron atoms and<br />
few-body nuclear systems. In atomic systems the implementation for larger sysitems<br />
is obstructed by the need of large diagonalizations or optimization of .<br />
multi-variables functions. The advantage of the hyperspherical coordinates formalism<br />
is it's unified <strong>de</strong>scription of the all atomic properties bellow the multiple<br />
ionization threshold. Recently a method which allow one to perform complex<br />
optimization procedures has been <strong>de</strong>veloped by Kirkpatrick at al. using statistical<br />
mechanics i<strong>de</strong>as and the i<strong>de</strong>a of "annealing" local minimum traps can be avoi<strong>de</strong>d.<br />
We show how the simulated annealing i<strong>de</strong>a and the hyperspherical formalism<br />
can be combined in or<strong>de</strong>r to calculate potential curves for complex systems.
AT11/8:00/5D.F IPOLIMORFISMO DO SULFETO DE ORTO-NITRO-DIFEN1LA. PREPARAci° E PRDPRIEDADES FfSI<br />
GAS DA FORMA META-ESTAVEL. Etualto Koibuchi Sokane a Darwin Bassi (Departamento <strong>de</strong> <strong>Fisica</strong> do Isetite<br />
to TecnolOgieo <strong>de</strong> A ee a tied - Sao Jose dos Campos).<br />
A presents coeunIcacio é parte <strong>de</strong> um trebslho main maple que visa astabeleeer a n eeeeeee con<br />
formational ou ogregacional <strong>de</strong> forms polimirficas <strong>de</strong> moisculas oral:fees, pelos sops infra<br />
vermglho a Raman. 0 sulfsto <strong>de</strong> orto-nitrodifenils apresente .duas formes cow panto. <strong>de</strong> . nisi°<br />
81,5 C (a: estivel) a 73,5 C (8: meta- ' 1). A li nao menciona mdtodos <strong>de</strong> absence° <strong>da</strong><br />
forma S pure. indlcando opena ■ o mo<strong>de</strong> <strong>de</strong> obtiAa em misters con a forma a, o qua i d do palm<br />
investlencio do panto do Ulna°. Neste trobalho, s primeira asostra <strong>da</strong> forme B pure foiobti<strong>da</strong>per<br />
inducio do seleneto <strong>de</strong> orto-nitro-diferille. tondo-se aquecido o sulfate at; 220 °C a juntado mum<br />
nom cri.tais <strong>de</strong> eel eeeee oo sulfeto nob temp <strong>de</strong> 60 °C. 0 p tot do em amine <strong>de</strong><br />
vidra no micros/410 <strong>de</strong> Roller porn medt<strong>da</strong> do panto <strong>de</strong> Fusin/. A parte afeta<strong>da</strong> polo seleniuo foi re<br />
tira<strong>de</strong>, verifIcando-se quo o sestante eta a forma 8 do smiteto <strong>de</strong> otso-nitre-difenile. Esse pr(sei<br />
ra nmostra funcionou come @emote pars f 'alluvia,. Esse operacio permits obterapenesalgumes<br />
eeeee nes <strong>de</strong> miligrseas <strong>de</strong> co<strong>da</strong> wee, pertain i <strong>de</strong>merit° um pr eeeeee em que quantids<strong>de</strong>s <strong>da</strong> ards ■ <strong>de</strong><br />
gramas po<strong>de</strong>m ser °bei<strong>de</strong>'. Reltera<strong>da</strong>s experanclas pormitirom estabeleeer es condition as que a<br />
forma a pods tronsformar-se no B puts. A conclusio é que o e a eee o <strong>de</strong> do cristaltzacio <strong>de</strong><br />
cal ofortemente cow a temper <strong>de</strong>salt's-0=mnd° quase per complete seise <strong>de</strong> 150 C. Ati cares <strong>de</strong><br />
:OD r a. w,liteillan a e P :<strong>da</strong><strong>da</strong> earl eeeee is nun Went-Wil<strong>de</strong>, quo <strong>de</strong>saparece ao rednr <strong>de</strong> 220 °C. A in<br />
terpretatio dosses remultadus permits sugerir que o polimurlisme do sulfetu do ortu-nitru-dllenlin<br />
; mails conformaeLonal do quo agregaclonol. F interpretscies <strong>de</strong> sapectros lab lho e<br />
!Inman po<strong>da</strong>rio tracer melhores Intermedics sob . (FAPESP - FINEP).<br />
Af0/0:20/5 1-17-1--<br />
FATORES quE INFLUEOCLAN 0 CKESCLMEN1U UO sEGUmuo COMMENT': DE STOKES EN DMA CCLOLA RAMAN,<br />
Marcos Til<strong>de</strong>n T. Pacheco (L <strong>de</strong> Estudoa Avontedos, CTA. Sao Jos; dos Campos, SP).<br />
Um dos principals fatores que limits, a off ' <strong>de</strong> <strong>de</strong> energia do feixe <strong>de</strong> bombe<br />
amento, pare o component, do primeiro <strong>de</strong>sloeamento <strong>de</strong> Stokes (Si), ; o sparecimento <strong>de</strong> radii<br />
quo do segundo <strong>de</strong>slocamenro <strong>de</strong> Stokes (52) <strong>de</strong>ntro do meio <strong>de</strong> interne's). Consi<strong>de</strong>ran<strong>da</strong>-se ape<br />
nesnpr oERE.aradiac3o is S2 nao iris interfetir na <strong>de</strong> energia <strong>da</strong> bombe pa<br />
ra SI, <strong>de</strong>eds que o ganho Kaman pare serape <strong>de</strong> S2 r pequeno, quando compared° no ganho Raman<br />
tiara SI. E . os pr paramaricoe forneeem um caminho polo qual a radiatio am S2<br />
pods crescor a cow tar um p <strong>de</strong> coopotisio eon St. No =Lori. dos cases experimentsis<br />
foi obscrvado quo o spa 1110 <strong>de</strong> S2, Co. navels <strong>de</strong> anemia eompariveis so <strong>de</strong> Si, ocorre pa<br />
ra valorem <strong>de</strong> potinciss <strong>de</strong> bombeamento bee priximos do limier do precis) Raman <strong>de</strong> Si. A explt<br />
cacao main divulga<strong>da</strong> pars este iota se boseia no efeito <strong>de</strong> retests° <strong>de</strong> Ease, que eeeeee OS<br />
process° paromitrico que germ S2 utilizando energia <strong>de</strong> St a SO (feime <strong>de</strong> bombeamento). Neste<br />
trabalho u mostrado que esta explicatio ; conflitante cam as fates expert ' du<strong>de</strong> qua<br />
eta presume uma alba eficiincia pars SO Si. Una nova explfeagno o proposts base<br />
ado apenas ue p paremitrico, sex lever as consi<strong>de</strong>voseo a retentio <strong>de</strong> face s um 'mama<br />
or efeito ERE envolwendo Si a 32.<br />
870/8:40/5A.F<br />
GERACSO DE RADIA00 EN 1,5em COM ALTA EFICIINCIA DE CONVENSSO, Marcos Ta<strong>de</strong>u T. Pacheco (Testi<br />
tutu <strong>de</strong> Estudos Avancndos, CTA. ao Jos; dos Campos. SP).<br />
A utilizacio do espalhomentu Kaman estimulado (ERE) pars seraglio <strong>de</strong> radiagijo no (en/erne<br />
lho prixime cow nivels significativos <strong>de</strong> potiecia tem ■e mostrado use acniea b prat_<br />
ca e convenience. Neste trabalho, i ap a<strong>da</strong> uma maneir ■ simples <strong>de</strong> se obter radiate° no<br />
regale do espectro, em torno <strong>de</strong> 1.5um, utilizando EKE. 0 e jo experimental inclui duos ci<br />
lulas Raman contendo mean° a bombea<strong>da</strong>s simul eeeee manse per us laser <strong>de</strong> Nd:YAG Q-switched. A<br />
primeira age emu um oseilador Roman gerando uma radiagio memento qua ; amplitica<strong>da</strong> ma awn<br />
dm riluta. 0 setano foi escolhido cono mein Mauna <strong>de</strong>vido so sou <strong>de</strong>slocamento Raman vibreeio<br />
nal, pie Permit, 'Ater radiagao eft I„Ssm con npenns us <strong>de</strong>olocamento Roman <strong>de</strong> rediesio <strong>de</strong> bom<br />
beanento, Una vamtagen agicional, aprusrma<strong>da</strong> pur emu: gas. ; a ribliorgia do radiagau cm ean<br />
primentes <strong>de</strong> on<strong>da</strong> no rciau aeima do 2,0,11n. 1st° C fun<strong>da</strong>mental neste experiments), <strong>de</strong>s<strong>de</strong> que<br />
elimina a competisao entre o SI a S2 (leineiro e swe<strong>de</strong> <strong>de</strong>staceweeLas <strong>de</strong> Stokes), PeKeibili<br />
tondo o Si atingir altos ufweis <strong>de</strong> putuneid. A tonfiguragao utiliza<strong>da</strong>, oseileorlamplificador,<br />
elisina. [ambito, a poasibili<strong>da</strong><strong>de</strong> do comp SI ',or<strong>de</strong>r energia via interacao.paromitrica pa<br />
✓i altos or<strong>de</strong>ns <strong>de</strong> Stokes, <strong>de</strong>vido ao controls <strong>da</strong> geometria do [elm 0 do pressao do gis nal<br />
duns ekulos.<br />
▪
AT0/9.00/5A.F j ESPECTROSCOPIA RANAN RESSONANTE Silvio Luiz Souza Cunha (Insti<br />
tuto <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFRGS - Porto Alegre)<br />
Oiscuti eeeee a aplicacio do ticnica <strong>de</strong> espectroscopia Raman . Ressonante no<br />
estudo <strong>de</strong> estedos moleculares repulsivos. 0 mitodo consist* em medir o espectro<br />
Raman envolvendo use ressonincie entre um estado molecular ligado e um estado<br />
dissociative usando laser sintonizavels. A varlecOo do espectro obtido cool o comprimento<br />
<strong>de</strong> ends nos traz informacao sabre a curve <strong>de</strong> energia potencial do estado<br />
repulsive superior. Esse ticnica baseia-se na formulacio <strong>de</strong>pen<strong>de</strong>nte do tempo<br />
pare o espalhamento Raman <strong>de</strong>sonvolvido por E. J. Heller et al. (J. Chem. Phys.<br />
68(5)2066 (19781; J. Chem. Phys. 71(12)4777 (1979); J. Phys. Chem. 86.1822(1982)).<br />
Em nesse laboratorio aplicamil esta ticnica no estudo <strong>de</strong> estadOT repulsivos<br />
<strong>de</strong> moliculas diatamlcas (C1 , 19) e poliatOmIcas (0." CBr I, CF 3 NO) usando um<br />
laser <strong>de</strong> corante continuo bbabeido por um laser <strong>de</strong> Xrgonid.<br />
AT0/9:20/5A.F IESTUDO DE DENSIDADES SUPERFICIAlE DE CAMAS ATRAVES OE CALCULO AO-<br />
CONSISTENTE. Marcia <strong>da</strong> Costa Pereira iinstituto <strong>de</strong> <strong>Fisica</strong> e Ouimlca <strong>de</strong> Sio Car<br />
Los, USP) a Gilmer Eugenio Marquee 1Departamento <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral<br />
<strong>de</strong> Sio Carlosi.<br />
A Mormagio <strong>de</strong> cargos eletricas em mammies <strong>de</strong> inversio em memicondutores e<br />
em superficies <strong>de</strong> Hello Liquid* esti bem emtabaleci<strong>da</strong> tent° tearica quanto experimentalmeate.<br />
Para semicondutoree a <strong>de</strong>eenvolvimento <strong>de</strong> cilculos autoconsistentea<br />
permitiu uma Twee complete carecterizacAo <strong>de</strong>e proprie<strong>da</strong><strong>de</strong>e <strong>de</strong>staa cama<strong>da</strong>a <strong>de</strong> cargas<br />
em superficiee <strong>de</strong> Hilio, pots no regime <strong>de</strong> baizes <strong>de</strong>nei<strong>da</strong><strong>de</strong>e micas cama<strong>da</strong>s po<strong>de</strong>m<br />
ser estu<strong>da</strong><strong>da</strong>c como o problems <strong>de</strong> um aletron. Para altas <strong>de</strong>nei<strong>da</strong><strong>de</strong>s superfi<br />
no entanto, os efeitos <strong>de</strong> muitoe corpos tornam-se role , requerendo -claim,<br />
portanto um tratamento autoconsintente. Neste trabalho, <strong>de</strong>senvolvemos este tipo <strong>de</strong><br />
cilculo pare o tratamento <strong>de</strong>miuse <strong>de</strong>nei<strong>da</strong><strong>de</strong>s euperficiaie <strong>de</strong> corgi; em Hilio, bem co<br />
mo em milidoe isolantes (Ne, Satire, HI a filmes <strong>de</strong> Hilio sabre algum mubstrato.<br />
Calculamos as energise <strong>de</strong> Traneicio <strong>de</strong> Estado Fun<strong>da</strong>mental pare o ■ 19 a 29 excite -<br />
dos e a distincia media <strong>de</strong> um elitron 6 superficie do material (em funcio <strong>da</strong> <strong>de</strong>ns'<br />
<strong>da</strong><strong>de</strong>) e obtivemos quo o termo <strong>de</strong> muitos corpos nio pole oar <strong>de</strong>eprezado, no caso ge<br />
filmes <strong>de</strong> Relic', pare <strong>de</strong>nei<strong>da</strong><strong>de</strong>e maiores quo 10 90°/cm 2 a pare o bulk", 104 - /cm .<br />
....■■■ ■■<br />
AT0/9:120/5A.F I UM (STUN SOBRE NOLTIPLAS SOLUCOES DA EQUAG1i0 DE HARTREE-FDCK-<br />
ROOTHAN PARA OS SISTENAS DE CANADA ASERTA<br />
R.N. TEIXEIRA FILHO, L.A.C. NALBOUISSON<br />
INSTITUT° OE FISICA DA UNIVERSIDADE FEDERAL DA BAHIA<br />
As equacies <strong>de</strong> Hartree-Fock-Roothsan (HFR) sio usualmeate resolvi<strong>da</strong>s por um<br />
procedimento iterative dotado <strong>de</strong> urns regra <strong>de</strong> or<strong>de</strong>namento. Recentemente <strong>de</strong>senvol<br />
comas um mitodo alternative <strong>de</strong> resalucEe <strong>da</strong> Equagie HFR pare sistemas <strong>de</strong> came<strong>de</strong>-<br />
fecha<strong>da</strong> no qua) este equacio a transforma<strong>da</strong> em um sistema <strong>de</strong> Equagies Alge-<br />
bricas nOo-lineares. Po<strong>de</strong>-se assim <strong>de</strong>terminer as mOltiplas solugaes <strong>da</strong> Equacio<br />
HFA por este procedimento. 0 mitodo foi spliced° cool sucesso a alguns sistemas<br />
diatimices.<br />
He present. trabelho generelita-se site procedimento pare os sistemas <strong>de</strong> ca<br />
na<strong>da</strong> aberta, coma introduzidos por Pople-Nesbet. Sio obtidos dole conjuntos <strong>de</strong><br />
equecOes algibricas nio-lineares correspon<strong>de</strong>nt's as dues equacoes <strong>de</strong> autovelor<br />
acopla<strong>de</strong>s do meted° HFR-Pople-Nesbet.
MEAS§.0 DC SUPRESSAO DE IMOINESCENCIA DO ESTADO EXCITADO DO ION<br />
UO POR ANIONS PIONCMALEHTES. C.A.Santarine (IPEA-UNESP-Presi<strong>de</strong>n-<br />
te Pru<strong>de</strong>ntol R. L. 2 Zimmerman (r.r.c.L. usr-RibaTiaC).<br />
Estudou-se a mace° do ion UranitO UO2 no estado excitado Com os ions inoroi<br />
nicoo ronovalcntos Nitrate NO 3 e Io<strong>da</strong>te IC 3 em solace° aquosa S temneratura ambi<br />
ante, utilizan<strong>da</strong>-se dos tecnicas <strong>de</strong> fluore4cencle no regime <strong>de</strong> estado estacionerio<br />
fotelise relimpago a fluoroscincia resolvi<strong>da</strong> no tempo. Com o aumeato <strong>da</strong> concentra<br />
cao <strong>de</strong> tale tons numa soluelo contend° Uranilo observou -se uma dimlnuicio na inten<br />
el<strong>da</strong><strong>de</strong> <strong>de</strong> fluoresconcia e no tompo <strong>de</strong> vi<strong>de</strong> para os nistemas Uranilo-Nitrato a urn<br />
gill.-lo<strong>da</strong>to, asstm comp o aparecimento Ina radicals NO3 e Moi reapPctivamente. I<br />
<strong>de</strong>ntificados or seus transientes espectros <strong>de</strong> absorcio eptica. Talc resultados -<br />
sugerem que a supressio <strong>de</strong> fluoreeeencia do ion Uranilo par ambos os Ions a <strong>de</strong>vi<strong>da</strong><br />
a uma magic <strong>de</strong> transferancia <strong>de</strong> eletrons. Discute -se nests trabalho, o mecanismo<br />
proposto para a <strong>da</strong>terminacio is constants <strong>de</strong> veloci<strong>da</strong><strong>de</strong> <strong>de</strong> supress5o <strong>de</strong> fluoresces<br />
cia para ambos sistemas.<br />
(Patroclnio CNEN - Camisole <strong>Nacional</strong> <strong>de</strong> Energia Nuclear)<br />
AIO/10:35/5A,Fi INIBICAO DA FORMACAO DE AGLOMERADOS DE SF 6 EM EXPANSAO SUPERSONI<br />
CA. Vladimir J. Trava Airradi, Evaldo J. Corat. Maria Esther Sbampato a Alberto<br />
N. dos Santos (Institute <strong>de</strong> Estudos Avancadoe - Centro Ticnico Aeroespacial -<br />
CTA - SSo Jose dos Campos, SP) a Cesar C. Ghisoni (Institute <strong>de</strong> Pesquillas Espa<br />
dials. Sao Jose dos Campos, SP).<br />
Neste trabalho 6 epresentado um novo meted° para medir a formaclo <strong>de</strong> ogle<br />
merados ou a inibiclo <strong>de</strong> aim formacio, em uma expanse° supersOnica livre e pulse<br />
Oa <strong>de</strong> molecules <strong>de</strong> SF6, quando radiecio intense <strong>de</strong> um laser pulsado TEA <strong>de</strong> CO2 a<br />
absorvi<strong>da</strong> pelas molecules. 0 principio <strong>de</strong>nte metodo 6 medir a distribuicao <strong>de</strong> e<br />
nergia do feixe molecular <strong>de</strong>pois <strong>de</strong> Nissan' per um colimador, com a sem radiacao<br />
inei<strong>de</strong>nte. A segun<strong>da</strong> expanse°, <strong>de</strong>vido ao collmador eatar posicionado na regiao<br />
<strong>de</strong> colis6es, 6 observa<strong>da</strong>. a °sea expansio a major quando a radiactio esta presen<br />
te. Com a radiacio incidindo. a <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> molecules excita<strong>da</strong>s a maior nits<br />
bor<strong>da</strong>s do false molecular. Este efeito pole set usado come um novo meted° pars<br />
separaclo isotepica.<br />
RI0, 10: 55/ 514 -Or annex AS DOLTtPLAs souGass DA squAcio HARTADD-Focx PARA S1STE-<br />
MAS DE CANADA COMPLETA (L.A.C. Malbo u institute <strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> Fe-<br />
lerel <strong>da</strong> labia - 40000 Salvador - BA 4 J.11.H. Fianna - Departamenco <strong>de</strong> <strong>Fisica</strong> -<br />
Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Brasilia - 70910 - BrasTITZ<br />
Aprasenta-se eandicee ■ <strong>de</strong> astabili<strong>da</strong><strong>de</strong> perm solusies H -Fork<br />
(H 11 ) censi<strong>de</strong>raudo-me d' do LCAO-HO-SCF. Palo sece<strong>de</strong> <strong>de</strong>menvolvido am<br />
coadicees <strong>de</strong> esembiti<strong>da</strong>ds Tao obti<strong>da</strong>s usando-se a teoria mama t cc <strong>de</strong> funcio m<br />
viriam varlivcis mujelta a condiqoas submidiiriss. Como um ■ <strong>de</strong>s coosaulancias do<br />
4;to<strong>da</strong> turna-m transparence ■ impo is dos orbitals virtual, no anillme <strong>de</strong>s<br />
imstabili<strong>da</strong>dds OF. Om remulcadom obtedo ■ sio comp:lea<strong>de</strong>n ■ resultados <strong>de</strong> Clark e<br />
Paldum pars o case do cama<strong>da</strong> compleca.
ATOM' 13/ 5A FICALCULO A2 IN!TIO DB MAIMS EN FRACMENTOS DE POLIACITILENO. Luis Carlos Caddo<br />
Freitim (Om' <strong>da</strong><strong>da</strong> Fe<strong>de</strong>ral <strong>de</strong> Pernambuco. Departamento <strong>de</strong> <strong>Fisica</strong>) e Maria Cristina dos Sastoe<br />
(Pontificia Universi<strong>da</strong><strong>de</strong> Catalics do Rio <strong>de</strong> Janeiro).<br />
Defeitos estru ' do tipo sOliton em cs<strong>de</strong>iae <strong>de</strong> pol"len, Lem ■ ido epontedos comp on<br />
responsiveis polo memento d r aa ico na condutivi<strong>da</strong><strong>de</strong> elitrica <strong>de</strong>sse ' I quando subeetido a do-<br />
pagm quingce. Divargos mo<strong>de</strong>les t proves a axiomatic's <strong>de</strong> estedos locallgados em energi ■ no<br />
mein do "gap" entre a bands <strong>de</strong> val - ' (completamente p bi<strong>de</strong>) a a bands <strong>de</strong> conduce° (vests)<br />
associadoe aos <strong>de</strong>flates. Ember. tiejsm <strong>de</strong>tected°a experimentalmente os aping elect...anima rrrrrr pen<strong>de</strong>nten<br />
i Drupes:a parcial do gavel do <strong>de</strong>feito - silicon rrrrr o - eenhum sine! <strong>de</strong> absorg4 Utica no<br />
resiio do energise rrrrrr pon<strong>de</strong>nte ao "xep" a encootrado no polimero pore. Em regime <strong>de</strong> balsa do,<br />
moo o materiel paean aaaaaaa r a etivi<strong>de</strong><strong>de</strong> ;tics esperadn, indicando quo a pumiceu do nivel<br />
do <strong>de</strong>tail* em relasio is bends' i bee aaaaa <strong>de</strong>pen<strong>de</strong>nte <strong>de</strong> mua populace° oietranies. Este trabelho<br />
tea por obletivo o estodo <strong>da</strong> estrutura etetranica <strong>de</strong> fragmentog <strong>de</strong> poliacetileno com a sem <strong>de</strong>feitos<br />
tipo silicon e a sus interacio cos dopantes apices, comp por exempla cm metals steeliness.<br />
Pretends-se investiger a <strong>de</strong>pend ds posisio do nivel do <strong>de</strong>feito em twine° go temanho do frag-<br />
ment°, i sun populace° eletrimica e ao tratneento mecinico.-q a aa ico utilised°. Serie compared°. cm<br />
resultedos obtidos <strong>de</strong> cilculoe liertree-Folk con os obtldos <strong>de</strong> cilculos cos i sin <strong>de</strong><br />
ronfieuresiies <strong>de</strong> co<strong>de</strong> eatu<strong>de</strong>remog o papal <strong>de</strong> Ince° aletrilinics solgre as propriedmice do adi-<br />
ton.<br />
Apoio FINEP-COPq.<br />
A10/11:35L5A.F1 liSTRUTURA CE011gIR1CA E ELETRaNICA DE SILA-E DISILA- CICLOBUTA<br />
DIEN°. A. M. MAROJO, A. L. A. FONSECA a NESTOR CORREIA - DEPARTA<br />
RENTO DE FISICA - IInR - 70910. DRASILIA-W<br />
Aprementa-se eilculos SCF ("Self-Consi Field") per. o ■ *sta<strong>de</strong> ■<br />
aingleto (fun<strong>da</strong>mental) a triplet° (primeiro excitado) para ciclobutediano cos car<br />
bono eubstituido por 'Mei° es uma e dual posisOes. Zotud-se as geometria. <strong>de</strong><br />
e quilibria nos <strong>da</strong>is anted°. a sue coneequ aaa i a no espectro <strong>de</strong> excltasso. Coopera-<br />
ge resulted°. MRDO ("Modified Neglect of DM. rrrr iaL Overlap") ab-initio.
ATC1/8:00/6A.F<br />
FINCH DE ONDA PAM A SgRIE IsecumMick DO HELLO<br />
larch' Tilaircio Fontanelle e Jason Alfredo Carlson Gallas,<br />
DepartamentA<strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFSC, 88049 FlorianOpolis.<br />
Calculos Femmes <strong>da</strong> energia do estado fun<strong>da</strong>mental do ion II - sugerem clue uma<br />
base proposta on 1944 por Llandresekhar po<strong>de</strong> ser mais conveniente qua a base traditional <strong>de</strong><br />
Ilylleraas. Prosseguindo com nesse trabalho anterior IJ Phys B 19, L639(1986)1 1 investigamos en-<br />
&tallies a base <strong>de</strong> Chandrasekhar. Nossa motivacio principal 6 aiterminar funcees_tentativas boas<br />
pars tratar Potentials admires (nio separiveis) qua envolvam explicitamente os angulos <strong>de</strong> Euler<br />
tats comp, por exempla, o efeito Zeeman quadratic° em atoms cam dois eletrens.<br />
(Partinlaente financiado pelo 01Pq,CAPES e FINEP)<br />
AT0/8:20/611.r EFEITO DE 154 CAMPO mA(NeriC0 INTENSD NA Immuck) eaRE<br />
IllUR3CgNIO E ANTI-11111ROCLIII0<br />
Jason Alfredo Carlson Callas,<br />
Departs onto <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFSC, 88049 Florianipolis.<br />
Apresentamos um mo<strong>de</strong>lo simples pars sbaular a internee° entre itomos <strong>de</strong><br />
bidrogenio e anti-bidroginio emyresenca <strong>de</strong> um cameo megnetico intenso. Alien <strong>de</strong> ser <strong>de</strong> interesse<br />
ears o entendimento dos interacoes fun<strong>da</strong>mentals entre sistemas <strong>de</strong> poucos corpos_em campus externs<br />
Intensos, o presente mo<strong>de</strong>lo permits estu<strong>da</strong>r o albite <strong>de</strong> correlacces tame situacao on qua aim<br />
esiste simetria <strong>de</strong> troca.<br />
A10/8:40/6A r EFEITO ZELNAN QUADRATIC)) EH H11102110<br />
Paulo Cesar leech (Depto <strong>de</strong> Clincias Excites <strong>da</strong><br />
Jason Alfredo Carlson Gallas (Dept* <strong>de</strong> <strong>Fisica</strong><br />
(Parcialmente Mancha& polo CNN,CAPES a F1NEP)<br />
FEJDUESC, 89200 Joinville) e<br />
<strong>da</strong> UFSC, 88049 Florimnopolis)<br />
Dando continul<strong>da</strong><strong>de</strong> aos nossos estu<strong>de</strong>s do efeito Zeeman quadritico em hidroginio<br />
pars intensi<strong>da</strong><strong>de</strong>s arbitririas do cameo (J Phys B 18, 2199(1985); 19, 1.215(1986)1, apresentamos<br />
restaltados obtldos coo o onsets<br />
pars nua, i.e. cam 17 parimetros varlacionais.<br />
0 . --rlt.aftwEin]/2 dij e iij tc4"J I<br />
cd1<br />
2i#JSX<br />
{Parc ealmente (ironclad° polo 0:1 1q,CAl'ES e FINEP)
AT 0/ 9 : 00/6" 17 EP11<br />
7171PLIPIC A 110 . C.A.Perrari, L.F.Sosman (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong><br />
UNICAMP).<br />
m.■■ ■ ■<br />
[rata-ma <strong>de</strong> om sistema <strong>de</strong> <strong>de</strong>teegio do @felt° Zeeman em molecules pscamagnitieem<br />
gels [Genic ■ do is mosnrIticm por laser. not raga° do IVI.(rocagio). A<br />
ei:lula <strong>de</strong> amur' Grata locale:o<strong>da</strong> na cevi<strong>da</strong><strong>de</strong> do laser-IVi, <strong>de</strong>senha-<br />
<strong>de</strong> <strong>de</strong> Lai nanelra que G passivel splicer campus magnitieos relativameote fortes<br />
( <strong>da</strong> cordon <strong>de</strong> 10 [Gauss ). gerados por um eletromagnsto eonntruido em 00000 la-<br />
boraterio. Com este ■ inem. pretro<strong>de</strong>mo ■ caracterisar ml g , que saris<br />
<strong>de</strong> grandr intereasr no controle <strong>de</strong> poinigio ambientnl.<br />
AM/9:20/611.F REVISIO NA LDENTIFICA00 DAS FRANSICOES ELEFRONICAS DO<br />
le<br />
LiA10:Fa - TeSerieo Abritie e Fernea<strong>de</strong> <strong>de</strong> Sousa Servos; lomLieuto <strong>de</strong> Mika<br />
3. I ap <strong>da</strong> um* r oo o Go no i<strong>de</strong>ntifieacio <strong>de</strong>s t 0000 igOes eletranicas_do<br />
on Fa come imp aaaaa no aluminato <strong>de</strong> litio. Hedi<strong>da</strong> ■ ds lum' exeitagao<br />
e absorcio Cot foram fajta. em amostras pollcriatalfnas na fame or<strong>de</strong>na<strong>da</strong><br />
<strong>de</strong>ste coeposto. 0 ■elhor ajuste Com o ■ nossos <strong>da</strong>dos, pare est. impuresa coor<strong>de</strong>nad ■<br />
dricamonee, foram obtido ■ 'mon<strong>de</strong> 11.605em -1 . C.3046em-1 (4 ■ 770em -I . sendo<br />
1<br />
medido um drelveameoto <strong>de</strong> Stokes do 933cm .<br />
ABaUAllai.if<br />
ESTUDO DAS INTENACOES IIIPERFINAS NA ESPECIE FeNH I . Joyce Terra,<br />
Liana Cuenzburcier e D.E. Ellis ICentro Brasile/re <strong>de</strong> Fesquises -Flecas e<br />
Northwestern university ).<br />
Atomos <strong>de</strong> ferro, aprisionados em matrices congela<strong>da</strong>e <strong>de</strong> &mania, rea9ern pare<br />
former a molecule <strong>de</strong> FeNH3 ao contririo do que econtece quando o gas 6 nitrogen/a<br />
ou metano. 0 espectro Neesbauer apresonte dues linhas estreLtas e <strong>de</strong><br />
igual intensi<strong>da</strong><strong>de</strong>. eugerindo uma Lnteracio quedrupolar e um satin <strong>de</strong> ferro<br />
bem dcfinido. 0 <strong>de</strong>elocamento isometrics medido 6 diferente do Fe* isolado<br />
em matrix <strong>de</strong> gas inorte, bem comet dos monemeros am matrixes do nitrogiinio e<br />
metano. Um grand', valor pare o campo magnetic° hiporfino a obtido, quando so<br />
aplica um campo magnet/co externo Saitovitch, H. Literst e J. Terra. a<br />
ser publicado). Utilizando o metodo DVM na aproximacao <strong>de</strong> <strong>de</strong>nel<strong>da</strong><strong>de</strong> local, cal<br />
culemos a donsi<strong>da</strong><strong>de</strong> eletainica, a gran<strong>de</strong>sa e o sinal do gradiente <strong>de</strong> campo<br />
olotrico a o campo hiporfino <strong>de</strong> contato, pare %ferias distancing Fe - N. Estes<br />
resultados foram comparados corn os <strong>da</strong><strong>da</strong>. oxporimentais dos paramotros hieerfinos,<br />
a Cl. <strong>de</strong> <strong>de</strong>terminer a provivel configuraceo eletrenica Para a espeCie<br />
FeNH .<br />
3
BIOFISICA<br />
Coin.:- Aeando 5.1to (IFUSP)
610/11:00/4A5 I SICIFISICA DC MELAMMAS - PERSPECTIVAS DE CMSENVOLVIMENTO. Maria Regina D. Iowa -<br />
aura e Anomie S. Ito Institute <strong>de</strong> Mica do Universi<strong>da</strong><strong>de</strong> ar sao Paulo.<br />
Om resultados obtido ■ no escudo <strong>de</strong> 'Wellman melanoprotdicos. /troves <strong>de</strong> vdriam cerulean' wipe<br />
rimentmlo dile eeeee s e Segundo uma abor<strong>da</strong>gem biofisica -molecular, perukes avenger ileums hipdte -<br />
leo relations so papel funcionol <strong>de</strong>s melaniaos. Cs particular, a exiatOncia <strong>de</strong> meconionso <strong>de</strong> trans<br />
ferancia <strong>de</strong> esergio intermaleculsreo pods sitar Iscioadds A alga acAo protetora.A partir e<br />
resultados emergem questaeo relevance ■ e problemos boo <strong>de</strong>finidos quo pods. coostituir -me em<br />
progremms <strong>de</strong> premolar'.<br />
810/11:20/4A.F<br />
N/HAS: ASPECTOS ELETROUICOS<br />
ESTUUO PRELIBINAR SOBRE A TENOENCIA DE POLIMERIZERAO OAS MELANI-<br />
Donis° S Calvert !MGM/URIC/MP)<br />
Junquotra Callas 11r-USPI<br />
ApeoliF a; ir;trutura a composicio dos molaninos nice ester bum caractorSza<strong>da</strong>. nee<br />
hii ch./vi<strong>de</strong>s du quo as uoi<strong>da</strong>doo molecularos envolvi<strong>da</strong>a ostao rolaclona<strong>da</strong>o a indolqu<br />
none. Haste trobalbo. ostu<strong>da</strong>mon. com bass no formalise° do Huckel.os aspectos 0=<br />
lett-anim ■ <strong>de</strong> tandincia do Polloorlzagio ( eee 6 ee ro. dfmero. trigger°. . Pollme<br />
ro infinitol <strong>de</strong> algumas moliculas relacipoo<strong>da</strong>s a Indolgoinona. A oscolha do mites=<br />
do. em prime/Iry logger. di continiul<strong>de</strong>do no troll/61hp do Pullman ■ Pullman. pormil.1<br />
do um ostudo comparotivo <strong>de</strong> todo o grupo. dontro do use mesma paramotrizacia. Ern<br />
'ound° lugdr a simplici<strong>da</strong>do dooso mitodo. ossociado aos bona rooultadoo obtidos<br />
flora molicuiao conjuga<strong>da</strong>s om goral. nos permit°, realizar um estudo initial rams<br />
velment@ conflivel pots 6 in<strong>de</strong>pen<strong>de</strong>nts do uma parametric/Kea goomitrics a a geomi<br />
trice. mosmo dos eee 6 mmm os mats aimplos i nia meta bolo caracteriza<strong>da</strong>.<br />
Este setudo 6 important. por duos rasa's: primeiro a important ■ conhocer ate quo<br />
panto as informaciios obti<strong>da</strong>s a portir do uma molicula pequona (por ommplo. um di<br />
morol sea relovantaa p.m o polimem. Poe exempla. os resultados quo nos obtivs=<br />
mos dos caiculos do antrutura do bandit e donsi<strong>da</strong><strong>de</strong>s do ootados (us primoiros roalimaan<br />
par.! °stes malarial tl nho cunrirmam as provlogies Calton a partir <strong>da</strong> extrapolac60<br />
00 celcuLos maloculamo por Pullman11S60.Em segundo lager nos permits<br />
<strong>de</strong>terminer quando a cilula uniteris a boom almula<strong>da</strong> par uma cadsia finita.<br />
461e/13:60/4A.F ESTUOD OE EFEITOS NAO-TERMICOS OA RAOIACAO LASER ER TECIOOS VI-<br />
kintca Alonso Cotta e Jorgo Humberto Nicola - ircw/umicem<br />
lioso obJetivo nosta trabalho 6 o <strong>de</strong> dor Idiilas finical sabre vorlos fenomenos<br />
hioleigicoo runclonals relaciona<strong>da</strong>s a irradlociso do tocIdog vtvos com I mmmmm <strong>de</strong> bat<br />
✓s potiincla - os efeitoo ofio-tiirmicos. David's h diversi<strong>da</strong><strong>de</strong> <strong>de</strong> comprimentoo do on<strong>da</strong><br />
0 donsi<strong>da</strong>dos do onergia com os quote foram obsorvados antori to ofoltas dos<br />
no tipo. Rangoon's a hiocitom <strong>de</strong> quo a coorincia do radiacio utiliza<strong>da</strong> fosse impar=<br />
tante no praceosa. rare tegtor n vali<strong>da</strong>do <strong>de</strong>nse hip6Mne. conntrufma um dinponiti<br />
vn nmonimynInl pormItindn n err-MI.10o <strong>de</strong> 10:1000 nIndon artSFIcialmentu no dorsu<br />
no rotos por um laser <strong>de</strong> Me-Me. ou - colocando-so um difuoor em movimanto h front'.<br />
do folio laser, oar radiacia dome mmmmm laser cam sou grau <strong>de</strong> coeronclo dImInoldo.<br />
Pole ab cio <strong>de</strong> oicatrizaclin don lassies, mostramas oar a c mmm m eta Tatar re<br />
Ievante no procesno confiding -ado. 00 panto do vista realizamos um ontudo<br />
sabre a distribuicio do cerium elitrico e intoosi<strong>da</strong><strong>de</strong> sabre uma superficie dota<strong>da</strong><br />
do micro-rugosi<strong>da</strong><strong>de</strong>s quando irrodia<strong>da</strong> par luz 000000 to. Em nossa opinion, uma distribuic6o<br />
<strong>de</strong>Dto tipo pads o c 0000 r em suporricion nelnlaron o influir dnrinivomant<br />
n a dn priiprin ci;ImIn. PM grandr pnrtn cunIulado par reniimouon elbtrl-<br />
ens quo ocarrem ao Frivol do membrane. Trobelhos main dotalhados vinando rolaciona<br />
teoria com resultados experimentels sotho es an<strong>da</strong>mento.
810/9100/4A.F<br />
PROPRIEDADES OPTICAS DA HEMATOPORFIRINA E DERIVADOS. Denim, Mari<br />
a Zesell , Jorge Humberto Nicola e Francisco B.T. Peemine, (.DeparcnoZWEiWifi=<br />
Tra—raido e Ciencia dos N &&&&&& 111. do lnatituto <strong>de</strong> <strong>Fisica</strong> 1 Dmpartamento <strong>de</strong><br />
Fisico-Quimica, do Institute <strong>de</strong> Quimicm, <strong>da</strong> UNICAMP )<br />
A clsme gallica international tem voltado Cu. atencio nom Ultimo ono ■<br />
pars use nova torpia, ive, no mento <strong>de</strong> - a chamadm Terapie<br />
Fotodinimic ■ <strong>de</strong> Cancer ( PDT ). 0 process° baseia-me no tato <strong>de</strong> quo tecidos malignoe.<br />
por seu particular metabolimmo, ab rrrrr m e/ou ratite <strong>de</strong>terminadom nnnnnn es<br />
<strong>da</strong> familia <strong>da</strong>m porfirinns que tenhom ai<strong>de</strong> injetodom no p nn i nnnn via venoms. Arra<br />
vim <strong>de</strong> emeitacio Optics remnant°, este. nnnnnnn s fluoresces pomsibilitando a<br />
dcteccio e <strong>de</strong>lineasio <strong>da</strong> t , e astimulando rongOes quisions. do <strong>de</strong>stru<br />
icio teciduml bmstente localisa<strong>da</strong>. Varian cosmoses tam mido investigados Pro-.<br />
toporfirina. ftmlocianina. etc. ). main utilisados nemt gernpin<br />
tim lido a hematoporririnm u scum <strong>de</strong>rivsdoa.<br />
Farina rag' doe os espectros apticon <strong>da</strong> hemetoporfirina e um d ' do<br />
em ■olusao agleam., em icido acetic° a acetona. Om aspoctros <strong>de</strong> mbmorcao e fluoram<br />
.<br />
cincia f m as localimaca do do omimmio ff , o qua<br />
beidios para entendimento do empectro <strong>de</strong> salami* via excitacio lamas<br />
tambim registrado.<br />
010/9120/AA.F IDINAMICA DA REACAO L/GANTE HEMOGLOBINA ■Marina P. Linhares, Lia<br />
J .El-Jaick, George Bemski e Eliane Majnberg I CBPF e *IF-UFRJ ).<br />
Nioglobina (Mb) e Hemoglobina (Hb) sio mo<strong>de</strong>los para o estudo <strong>da</strong>s proteins. A<br />
reassoclaceo do CO com a Mb foi observa<strong>da</strong> por Austin et al (1) clue postularam a<br />
exlstincia <strong>de</strong> subestados conformacionais. Para tenperatura (T) malor quo um <strong>da</strong>do<br />
To , uma molecule <strong>de</strong> protelna move-se rapl<strong>da</strong>mente entre os diferentes subestados,<br />
variando continuamente a sua estruturae para Tvre co<strong>da</strong> molecula permanece preen a<br />
um particular subestado. No<strong>de</strong>los teericos tem lido propostos relacionandoabarrei<br />
ra <strong>de</strong> energia potencial (B) <strong>da</strong> reacao ligante-proteina com a confiquracio <strong>da</strong> pro -<br />
taloa. NOs ajustamos as curvas <strong>de</strong> reassociacio para T4.100, 140 e 180K <strong>da</strong> lib <strong>da</strong><br />
Carps (2) utilizando 3 mo<strong>de</strong>los (1,3,4) e encontramos resultados mostrando nue osmo<br />
<strong>da</strong>les servem igualmente pare Mb a Hb para Telo . Estamos realizando experiincias<br />
RPE <strong>de</strong> fotodissociacao do ligente NO <strong>da</strong> lib human°. Em usa experiencia tipica<br />
para T.14K, 51% dos ligantes foram diasociados em 3,8 minutos a 9,3% reassociaram<br />
<strong>de</strong>pots <strong>de</strong> interrompi<strong>da</strong> a iluminaGio. Os mo<strong>de</strong>los tooricoo nalo njuataram ben a cur.<br />
va experimental neat. T on<strong>de</strong> exists a possibili<strong>da</strong><strong>de</strong> <strong>de</strong> tunelamento quentico. Neste<br />
caso a constants <strong>da</strong> reavio 4Atexp1-md(2Me 7/2E) an<strong>de</strong>Ate o fator <strong>de</strong> frequincia, d<br />
a largura <strong>da</strong> barreira <strong>de</strong> energia e N a maims reduzi<strong>da</strong> do Ferro e do ligante NO. Es<br />
tamps refazendo os ajustes <strong>da</strong>l curvas experimentais obti<strong>da</strong>s e preten<strong>de</strong>mos obter no<br />
von resultados para una faixa <strong>de</strong> T entre GA e 30K.<br />
11 R.H.Austin et al, BlochemLstry 14 (1975) 4344 - 21 N.G.Cobau et al, Biophys.<br />
J.47 119831 781 3) N.Agmon et al, J.Chem. Phys. 79 (1983) 2042 4) R.D.Young at al,<br />
J.Chem. Phys. 81 (1984) 3730.<br />
B10/9:40/aR.F "KODULACAO PALO GRAD DE HIDRATACAO DA SIKETRIA DE CANPO CRISTALINO E ESTADO DE<br />
SPIN 00 100 FERRO EN HENOPROTEfNAS". Ladislau martin Nato. Sergio Hamcarenham (EMBRAPA-UAPDIA). Po<br />
smeary Ranches. Marcel Tabak a Otaciro R. Namcimento (Institute <strong>de</strong> <strong>Fisica</strong> a Quimica do Rio Carlo.-<br />
- SSP)<br />
E. contlnul<strong>da</strong><strong>de</strong> ao escudo por Rensonancia Paramagnitico El (RPE) do mcompanbamento <strong>de</strong> alto<br />
✓esales no centre ativo (hems) dm hamoproteinas modula<strong>da</strong>m pela canna° do gran <strong>de</strong> bidratacio aprexentamos<br />
resultados obtidom pars a mete Mb e Nitromil-Hb dm boleis e meta Hb bosina A tom<br />
dir grans <strong>de</strong> hid - (0 a SO2 em peso) foram obti<strong>da</strong>s submeti<strong>da</strong>s as medi<strong>de</strong>s <strong>de</strong> RM. a<br />
T. -160°C. am nm eeeeee Smarr° Varian E-109 Rondo R (9CHz). Porn as duas prateinus. na forma meta,<br />
0. !SS eeeeee coraceerfmarom-se par finhom <strong>de</strong> mbnercrins cam Oa negoinces valorea <strong>de</strong> at g-C; g-4,3 e<br />
R-2. du (en ferry (111) en dlrerente ■ eatadom <strong>de</strong> spin simetrlam, e g..2.01 <strong>de</strong>vldo a um radical li<br />
ore erlado no p <strong>de</strong> <strong>de</strong>s1draeaelio. Aransas <strong>da</strong>m ob eeeee sign dos tuataras is d1lerentee hidrate<br />
✓ies foram: a) oaring:0 munotanica <strong>de</strong> largura (p/ meta Hb) a intensi<strong>da</strong>d (p/ meta lib e meta Hb) do<br />
Hobe <strong>de</strong> absorsio do Ion Cerro (Ill) coo g-b (mimetria axial). A partir d bsorvagipen fieou c<br />
vi<strong>de</strong>nciado. pars a mete Hb. o valor <strong>de</strong> bldratosio <strong>de</strong> 0.20gr 1110/grMb coma um valor critic° tiara o<br />
promise, <strong>de</strong> estbilitasio dm conformacio dm protein. "native; b) comiscincla <strong>de</strong> <strong>da</strong>is <strong>de</strong><br />
spins ( 512 (meta) a 1/2 (hemicromo)j porn AMP M Wilma hldrnterio; e) a iniensi<strong>da</strong><strong>de</strong> do Huh,<br />
<strong>de</strong> absorsio do radical livre <strong>de</strong>e eeeee com o aumanto do gran <strong>de</strong> bidratacio. Inicion-se Umbels medl<strong>da</strong><br />
■ utillsando o menixido <strong>de</strong> nitroginio (NO) coon liganta parm a Mb <strong>de</strong> baleia. 0 sinl <strong>de</strong><br />
RPE monitorado para este <strong>de</strong>rivado (Illtroall-Mb) i do praprio grupo NO o alteradies significativms<br />
sits ob ee s nap amostras em dife eeeee a hidretcoes.<br />
Suporte Flnancerrni FINE?. FAPESP e
010/10:15/4A F<br />
ESTUDOS DE ESPECTROSCOPIAS INFRAVERNELHA C FOTO-ACOSTICA DE NEM<br />
MARINAS HUNANAS DOS TIPOS A E SS B HENOGLOBINA DE Rana catasbeiana. Niusa Apareci<strong>da</strong><br />
Marighato, Jose I:Aria —Cat-am Vasconcellos(InaHt to a Mice Correa<br />
Me re 1 lea Ins t tuto <strong>de</strong> Biologia -UNICANP<br />
sic feims estudos espectioso3picas ezierimaitals fe hesoglckanas bananas dos<br />
tips A e SS e <strong>de</strong> henoglrbina <strong>de</strong> Rana catesbeiana atraveo <strong>de</strong> dual tfiadras: 1- Esparta:so:pia <strong>de</strong><br />
linear na regal <strong>de</strong> 2000T OFTORITr itilinando espectiofotanotcoe. Na raga° <strong>de</strong> 2000<br />
a 7000 A Iraqi& %drivel do enectro) as &mitres asap no forma 4k soluciae- s aquosas. ApSs<br />
13000 A, a for alasarcio <strong>da</strong> gum impe<strong>de</strong> qua se utilise aoluplies aqtreaS. Utiliza-se antic) uma<br />
pastilba <strong>de</strong> 103r aptt ste parfatt! na qual a mantra 8 inseri<strong>da</strong>. Ciam esta arnica as espectros<br />
silo end:Mi<strong>da</strong>s <strong>de</strong> 13000 A a 400000 A. Prcoura-se taub&n <strong>da</strong>ter aspecteas <strong>de</strong>s anostras <strong>de</strong> hemaglobina<br />
na raglan <strong>de</strong> 2000 a 13000 A tanheo'c mat a paetilha <strong>de</strong> Par perm efeito oceperatiuo. Co:paragons<br />
entre as difezentes henaglabinas nes moms macs espec1xais sia Ealtas. 2-<br />
pia ibto-actistica na raga° <strong>de</strong> 2000 A a 7000 A. Po<strong>de</strong>rlmaa estar<strong>de</strong>r tel !spectra at8 111 E5P0erirapreannta<br />
nenhuno 1.1rise <strong>de</strong> aboar9r.<br />
nas espactro (tail gual vislyel)<br />
Apas a obtuncao dor.<strong>da</strong><strong>da</strong>s experimmtais price<strong>de</strong>nos a anal:Ise tactrice <strong>de</strong>s name<br />
Unitas obti<strong>da</strong>s efetuencb urra cc maraca° entre as hemaglabinas <strong>de</strong> diferentee especial a <strong>de</strong> diferentes<br />
tips.<br />
910/10:35/4A.FI EMI= DA TELRANCIA DR PLANTAR DE MILRO AO 'mufti° TGILCO. UTILI<br />
ZANDO-SE ESPECTROSCOPIA FOVOACOSTICA "IN VIVO". C.A.Vinha (Depto.Prmica..UFHS), W.<br />
A.B.Serra OFGW-UNICA1114. William Jose <strong>da</strong> Silva (18-UnictimP).<br />
O objetivo do trabalha a i<strong>da</strong>ntificar am *faits. do alusinio taxica axi eeeeee no<br />
solo sabre a 00000 ;aria <strong>de</strong> Clorofila nos folhas <strong>de</strong> plants' <strong>da</strong> glib* sensiveis a<br />
tolerant,. i acio o ' <strong>de</strong>s.. metal. S utiltsa<strong>da</strong> ■ nape o pia fot ice<br />
na rasa° do v' ' 1, sendo <strong>de</strong> particular interesse a pito <strong>da</strong> Clorofila a, ten-<br />
trado in 6410nn. . Sao reslisadse ■nilises "in vivo" utilisando-se una c2luLa<br />
fot ice ■ propria<strong>da</strong>.<br />
1310/10:55/4a.F1 fDENTITICACAO DOS PADRoES DC BEBIDAS DE CATS, UTILIZANDO-SR ES-<br />
PECTROSCOPIA FOTOACCSTICA B SESSOMINCIA KAC/121fCA. C.A.Vinha (Depto.FIsica-OVHS).<br />
H.Verga ■ a F.C.Silva (IFCD-UNICAMP).<br />
Infloincias regionals, calm coon tipo <strong>de</strong> solo. uni<strong>da</strong><strong>de</strong> do ar, inetdincia <strong>de</strong> radio<br />
qie molar, etc. sio responsiveis palm ocorrincia <strong>de</strong> diferenres sabot-es <strong>de</strong> bebi<strong>da</strong>m<br />
<strong>de</strong> cafe ( Rio. Mole, Duna, etc. ) nom dife 00000 s valorisaq ' ' . Atual-<br />
nente a dierinqio i faits a partir <strong>de</strong> aniline sobjetiva <strong>da</strong> "prove <strong>de</strong> goato" remit<br />
sad ■ par provadore ■ profissionaie. 0 objetivo do trabalho a tenter distinguir 02<br />
padraes <strong>de</strong> bela<strong>da</strong>a etravis <strong>de</strong> snail do pa <strong>de</strong> cafe do, utiliaen-<br />
do-se asp pie no IV prOxima. paramagnetica e reignite:sale maga!<br />
Lice nuclear.
"CARACTERIEACi0 E FORPIACAO DE RADICALS LIVRES MA 11011CULA DE 2,2.6.6-TETRAMETIL<br />
IMMO A TECNICA DE EPR E RALO X."- Melds Fieveiredo Koury. Marcel Tsbak<br />
wire Rangel Maseimento. (institute <strong>de</strong> <strong>Fisica</strong> e Quimica <strong>de</strong> Sio Carlos - USP).<br />
linha <strong>de</strong> pesquisa re eeeee mente Implenta<strong>da</strong> no laboratOrio <strong>de</strong> Blofisice <strong>de</strong> Sio Carlos, <strong>de</strong><br />
loci° <strong>da</strong>p fatless cap - leas (CPR) <strong>de</strong> radical. Livros predux.idos pela retie<br />
io em molecules °rayless, portieularmeote precursory. <strong>de</strong> mercadore ■ <strong>de</strong> spin. 0 2.2.6,6 - tetrame<br />
11 - 4 - piperidonu . quo e dismogratico. quando °ai<strong>de</strong>d., is transforms no ■pin label nitre:mid°<br />
.2.6.6 - tetriametil - M - oxyl (Tempone).<br />
irrodian<strong>de</strong> o eristal diamagnetic* vita cal° N, parasegniticos eio criados, possibIlltando s<br />
tilleecio <strong>da</strong> tecotcs <strong>de</strong> CPR es sua cccccccc izaceo. Fors. felts. meads. <strong>da</strong> %cerise'', angular do<br />
mope magnetic° um relscio so c ttttt 1 i temp bleate. FMCS OMB sillier resolucio espectral.<br />
■ medl<strong>de</strong>s foram Lambe. realized. ■ i tempo do ultras:lila Liquid°. 0 asp btldo consist.<br />
llnham. com no <strong>de</strong>o<strong>de</strong>brameoto dubleto malor um <strong>de</strong>sdobrismanto tripleto moor. Ob -se tamhim<br />
e sdobromentoe sellelomais secuudirlos. particulermeste em cope Mix°. 0 que pods ester relaclena-<br />
o come um outre paremagnetLco..<br />
tomes calculondo as valor.. <strong>de</strong> g e A . ■ observing° a vorlacio do espectro coo a temperature es<br />
<strong>de</strong>termined° Ongulo, perm i<strong>de</strong>otlficar o centre paramagnetic° tui molecule (1).<br />
H10/10;35/4A,Fj" CPR DO ION Cut* Ell TRIPTOFILGLICIMA". Carlos A.F. Plinio e Oteetro Rangel Na.<br />
clueing. Institute <strong>de</strong> <strong>Fisica</strong> e QuImics <strong>de</strong> Sip Carlos - USP.<br />
Saba-se que dimemsam residues. ou caddies I is, que compiem ums procefas po eeeee gropes ativos<br />
que po<strong>de</strong>m se compleser cam morale <strong>de</strong> Ivies. ands into <strong>de</strong>pend, do pe a <strong>da</strong> relocio estegoisme-<br />
trice envolvi<strong>da</strong>. A importeacia doe escudos <strong>de</strong>stes complexes se aaeaatram me lance° que po<strong>de</strong>m usercer<br />
was organisms' view.. 5 a case <strong>da</strong> hemoglobin. proteise complexa<strong>de</strong> cm Fe. do o papal<br />
<strong>de</strong>gransperte <strong>de</strong> osigOnlo no mange. 0 0 <strong>da</strong> hemocionima. Este Ultima e uma proteins complexado coo<br />
Cu que realize o transports <strong>de</strong> oxIsiolo nos i bredos marlahos. Um gement:. multo 'rends <strong>de</strong><br />
possiblli<strong>de</strong><strong>de</strong> ■ <strong>de</strong> mord - z la<strong>de</strong>n °comae, <strong>de</strong>pea<strong>de</strong>mdo dos residues <strong>de</strong> amino-ecidoe participootim<br />
A formaceo <strong>de</strong> complexes <strong>de</strong> Cu com peq pepti<strong>de</strong>°. pessIbilitom o escudo d possiveis coax<br />
<strong>de</strong>nscOes e disto titer informacies mail conclusive. a commit° <strong>de</strong> complexes <strong>de</strong> Cobre corn gran<strong>de</strong>e<br />
pepti<strong>de</strong>°. go proteins.. Neste trobalho, utilise-ad o triptofilglicina pars satudor a lofluiscis do'<br />
residua lateral peas& sobre a estereoquimica dos complexes tornados cos o Ion Cu 2f. Medi<strong>da</strong>s <strong>de</strong><br />
Re aaaa incla Paramagnetic" Eleeriales (EPR) e Absorcie °tics no visivel ■ temperature ambient" e<br />
Nitrogenio liquido foram malteds@ em dif pHs. A formacio <strong>de</strong> cristel ■ possitIlltaram medi-<br />
<strong>da</strong>m <strong>de</strong> EPR e estudom <strong>de</strong> <strong>da</strong>me. <strong>de</strong> Tato I. A act do SUB SS aaaaaaa cristallaa esti son-<br />
<strong>de</strong> realizs<strong>da</strong>.<br />
B10/11:55/4A.FinESPECTIOSOOPIA VOTOACdSTICA DE REMOCLOSINA LIOPILIZADA-EFEITOS DA RIDRATACAOH .<br />
marinoolo Lopem Cornelia. Rosemary Beacham, Halloo Vargas& a Sergio Ma hamar, . IFOSC-USP.S.Cor<br />
Los; 1FLII-U1ECAMP. Campine" e saCURRAPMUAFDIA. S.Carlos.<br />
Mosse objetivo i *see<strong>de</strong>r a impo is <strong>de</strong> igua pare ■ ocorrincla do oxisenagio <strong>da</strong> hemoglobins e<br />
Camscamos estudondo ■ hemoglobins humane caw a ligente monoxi<strong>de</strong> <strong>de</strong> carbon (Hb-00).P0 -<br />
re comtrolar o aaaaa Lido <strong>de</strong> egua as ssostra. a hemoglobin i liofilizads e coloca<strong>da</strong> ea ambiences<br />
rem dif umf<strong>da</strong><strong>de</strong>s relatives. As =<strong>da</strong>nces qua acorns. as regLio do grupo hems <strong>da</strong> hemoglobins<br />
po<strong>de</strong>m ser i<strong>de</strong>ntifleados pale earner° <strong>de</strong> absorceo na regiio vioivel. Como nooses smo aaaaa sio epee...<br />
utllizamos a cicalae <strong>de</strong> asp pia fat perm obter sates espectros. 0 que se<br />
observe e que emo aaaaa mentidom ate 752 <strong>de</strong> ',ai<strong>de</strong>d, relative possuem a bonds <strong>de</strong> Surer is toruo <strong>de</strong><br />
119 mo. carseteristica <strong>de</strong> Mb-CO. Para a amoatra =ari<strong>da</strong> a 912 <strong>de</strong> umi<strong>da</strong><strong>de</strong> relative a bands <strong>de</strong> Sores<br />
este <strong>de</strong>oloce<strong>de</strong> pars 414 nm. o q ice a hemoglobins cos o llgente 0,. Estes dodos "user's<br />
que. apeser <strong>de</strong> em :atua° a ofinI<strong>de</strong><strong>de</strong> <strong>da</strong> hemoglobin por CO ser circa <strong>de</strong> 200 malor do que e<br />
afloi<strong>da</strong><strong>de</strong> per 0 2 . pore a hemoglobina ns forum <strong>de</strong> pa e mom hidratocio ,uric!<br />
o CO par 02 . A ocorriacie dm Indica que a Ligacio Fe-CO tio s aa i aa 1 quanta<br />
eaq que a necessi<strong>da</strong><strong>de</strong> <strong>da</strong> Ova augers que pare que °carte a troca a aaaaaa isl que a proteins<br />
tenha flexiblli<strong>da</strong><strong>de</strong>. Vama p <strong>de</strong>terminer cos mats testicle° ■ hidretacio que poesIbIlite a re<br />
laxaceo conformocional do proteins s esten<strong>de</strong>r a esrudo pars as bends" <strong>de</strong> ebsorteo no raga° <strong>de</strong> SOO<br />
a 700 nm. 0 escudo <strong>de</strong> ■logloblne uervITA <strong>de</strong> cuotrole e pore Levi:oilier a passive/ Influencla <strong>de</strong><br />
ham as estrutoro quateroiria <strong>da</strong> hemoglohin.<br />
Apole Pi iro - CNPq e TAPES'
1110/13:00/6A.F I TR/MS[0ES DE FASE DO TRANQUILIZANTE CLOROPROMAZINA E SUA INTERA<br />
CID COM SICAMADAS DE 1.1P1DEOS II MEMBRANAS. Sonia Lour°, Paulo AT-<br />
?arta Nusse aaaa ia. Marcel 'rebel's. Mane Weinberg**. PUC/R.1 ■ IFOSC. +ACIIPP.<br />
Tranquilisantes e anestesicos. em genii, ■ io moliculaa. anfifilicao quo ages &trim<br />
via <strong>de</strong> interasio tom mmb . Corn o. objativo <strong>de</strong> escla aaaaa seta intermsio vi-<br />
rio ■ trabslhos. utilisamdo di farmacos. tem ■ ido reelisados. Ain<strong>da</strong> email, o<br />
i a mo do acio <strong>de</strong>sta ■ drugs ■ continua ob . . Neste trabalbo astu<strong>de</strong>mo ■ me<br />
provie<strong>da</strong>d ■ dm cloropromasin ■ (CFZ) au solos.° sum intorasio tom si <strong>de</strong><br />
lipcdio ■ com membranes biolOgicas, atravis <strong>da</strong> ticnica <strong>de</strong> msreadors <strong>de</strong> spim.U-<br />
tilisando um marcedor dorivado <strong>de</strong> :cid° gramo aaaaa tramps ulna concntrasio mice-<br />
ler critics dm ordo <strong>de</strong> 0.3 mo <strong>de</strong> CPZ. N ■Icles a aaaaa dor me encontra for<br />
temente imobilisado. I. concntrasos mis altos hi ulna 'sio <strong>de</strong> Case <strong>de</strong>tec-<br />
ted. polo ■pareciroto <strong>de</strong> um espectro do ESR <strong>de</strong> <strong>da</strong>res f .to imobiliss-<br />
dos. Beta era:Boise° <strong>de</strong>pends fortement do pH <strong>de</strong> ■oluceo. A igio i I i<br />
<strong>de</strong> Co. a diminuisio do ph. Foram faits. medi<strong>da</strong>s do oleic° dm CPZ ■obre o tempo<br />
<strong>de</strong> lecio <strong>de</strong> marcadores incorporsdo ■ a aaa 1' a alms <strong>de</strong> llpidios e ligado ■ a pro<br />
teEnas <strong>de</strong> membranes <strong>de</strong> eritricitom.<br />
Tri/.,n/A. F IPPOPRIEDADES DE MEW /0 DO AwrialOrico AMFOTERICINA B: APLICACAO DE TECNICAS<br />
F SICAS.- M. Teresa Lamy- Freund. Verginia F.N. Ferreira e Shirley Schreier. Departamento <strong>de</strong> Iliaquindca.<br />
Institute <strong>de</strong> Quimica. Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sio Paulo. C.P. 207110, Sao Paulo. Brasil.<br />
Anfoterictna B (AB) i utilize& no tratamento <strong>de</strong> infect*, mIcaticas sistimices, agindo<br />
a nivel <strong>de</strong> membrana celular. causando alteraciies <strong>de</strong> perneabili<strong>da</strong><strong>de</strong>. Para fins clinlcos a solubili-<br />
<strong>da</strong><strong>de</strong>.<strong>da</strong> droga em meio aquoso aumenta<strong>da</strong> atravis <strong>da</strong> sum coaplexaciocom a <strong>de</strong>tergents <strong>de</strong>soxicolato<br />
<strong>de</strong> sodio (FLOC). Nos estu<strong>da</strong>mos proprie<strong>da</strong><strong>de</strong>s estruturais <strong>de</strong>s micelas mistas <strong>de</strong> AB: DOC atravis <strong>de</strong> es<br />
pectroscopias <strong>da</strong> Also:Nan otica, dlcrofsmo circular e ressonincis parimmemetica eletr8nica.<br />
undo o toreador <strong>de</strong> spin 2-(3-carboxipropil) -4.4-dimetil -Z tri<strong>de</strong>cil-3-osazolldlniloxil (5-SASL) in<br />
corporado a agregados <strong>de</strong> AB: DOC e/au a mdcelas <strong>de</strong> DOC. possivelvente tuba presentes no mitt,<br />
observamos a existincia <strong>de</strong> duas papulasoes <strong>de</strong> marcador: use fracamente e outra forteuente inobili -<br />
:A<strong>da</strong>. 0 equilibrio entre es duas .populacBes <strong>de</strong>?en<strong>de</strong>nte <strong>de</strong>s concentracoes <strong>de</strong> AB e DOC. g sabido<br />
que o DOC passe por diversos estagios <strong>de</strong> egregacao <strong>de</strong>pen<strong>de</strong>ndo <strong>de</strong> sun concentracio no mein. Foi pos<br />
sive! associor urn modificacio <strong>da</strong> micela <strong>de</strong> DOC com a reestruturecio <strong>de</strong> agregados <strong>de</strong> AB: DOC presences<br />
no meio. Consi<strong>de</strong>rando quo o firasaco a lentamente injetado no corrente sanguinea. <strong>de</strong>pendin<br />
cis do estado <strong>de</strong> agregacio cam a concentracio po<strong>de</strong> sir um fator importante nos ereitos toxicos<br />
terapiuticos <strong>da</strong> droga.<br />
Apoio Financeiro: CNPq. FAPESP e FINEP<br />
O10/11.40/6A F MONICA E ESTAB1LIDADE DS FILMES DE LIPtDIOS - Nice Maris Ameri-<br />
cana <strong>da</strong> !iota Costa Pinto e Paulo N llo Bisch (UFBA/CIPF) - 0 comp<br />
dinimico a a estabili<strong>da</strong><strong>de</strong> do films dm lipidios mite analisados aaaaa Os <strong>de</strong> um modu-<br />
lo hidrodininico a<strong>de</strong>quado i simulacio do films: 3 Erne Ildids Incomp aaaa ivele e<br />
viscose.. isa<strong>da</strong>s pole <strong>de</strong>nsi<strong>de</strong><strong>de</strong>. pormissivi<strong>da</strong><strong>de</strong> el' ' '<strong>da</strong><strong>de</strong>ol<br />
para<strong>de</strong>s per duas superficies letricamente carrege<strong>da</strong>m. A dinimica do sistema<br />
d ' <strong>de</strong> di levier-Stokes, consi<strong>de</strong>red.a as L Co.. <strong>de</strong> Va.<br />
<strong>de</strong>r Neale. eletrostitica <strong>de</strong> curio al . e ■ atisfasendo a condicOes <strong>de</strong> cantor<br />
no na ■ interfaces. A ■ oincio do problems em torsos do campo <strong>de</strong> veloci<strong>da</strong><strong>de</strong>s, obti-<br />
<strong>de</strong> per ulna aniline <strong>de</strong>s p baeOse tin aaaaa eon relscio eo estado stmcionirice.<br />
conduz ulna equacio <strong>de</strong> diup que caracterise a din:mica do ■ istema <strong>de</strong> qual<br />
sip retirados on eritirios <strong>de</strong> estmbili<strong>da</strong><strong>de</strong> do Mee. Cm torso ■ do distribuicio <strong>de</strong><br />
cargos a aaaaa elitrico sio estu<strong>da</strong>dos doffs camas: m) films com dimtribuicio ■ ini-<br />
erica <strong>de</strong> carges e b) films submetido a uma diferenca <strong>de</strong> potencial.
1110/9:00/6A.F IBACTERIAS HAG/MICAS EM REGIME OE CAMPO MAGMtTICO OSCILANTE<br />
Henrique G. P. Linn do Barros a Darci M. S. Esnuivel (Centro Brasi<br />
leiro <strong>de</strong> Pesquieas FInicas). Bactirlas magnetotacticas apresentam uma interacio<br />
tipo dipolo-magnotico coat o campo magnatico externo. Um dos problepas encontrados<br />
ao estu<strong>da</strong>r estee microorganlsmon 6 <strong>de</strong>terminar, nor vias experimentals, o momenbodc<br />
dipolo permanente <strong>de</strong> unto unica cilula. Ate o moment° twos coma metodoa, o estudo<br />
<strong>de</strong> reorientacio <strong>de</strong> bacteria@ quando o campo 6 oubitamente invertido, a <strong>de</strong>teroina<br />
cio <strong>de</strong> quanti<strong>da</strong><strong>de</strong> do material magnetic° no interior <strong>da</strong> caul& (via microscopia ele<br />
tronica) e o estudo <strong>da</strong> veloci<strong>da</strong><strong>de</strong> <strong>de</strong> odoracio on funcio do campo maonotico. Rota:<br />
mos trabalhando no solucio <strong>de</strong> problema <strong>de</strong> uma bacteria magnetotactica submeti<strong>da</strong> a<br />
um campo magnetic° oecilante (B stn wt). Rota solucio fornece um regime <strong>de</strong> ressonincia<br />
on gue a frequencia a intensi<strong>da</strong><strong>de</strong> donute campo esti° relacionados coat o momanta<br />
magnetic° <strong>da</strong> celula. A ob cio <strong>de</strong> bacterian maqnetotacticas sob a acio<strong>de</strong><br />
campos magnetic°. oscilantea <strong>de</strong> balms frequencia icerca <strong>de</strong> 10 Hz) coat intensi<strong>da</strong><strong>de</strong>s<br />
<strong>de</strong> corms <strong>de</strong> 5G mantra que 6 passive' <strong>de</strong>terminar. em laborat6rio, o regime ressonan<br />
te.<br />
B10/9:20/611.F VISCOELASTICIDADE es BIONATIRIAIS. Osamu Eimouthi Mho, Institute <strong>de</strong><br />
n eiea gamic' <strong>de</strong> Sio Carlos - U n i '<strong>da</strong><strong>de</strong> <strong>de</strong> Rio Paulo, Co. Postal 369, 13560 Rio Carlos<br />
- SP; Ren'L Rata. Johnson a Johnson; Robert Les Zimmerman, Facul<strong>da</strong><strong>de</strong> <strong>de</strong> Filosofia, Camelia<br />
Latvia e Ribeirao Preto - Universi<strong>da</strong><strong>de</strong> do Sao Paulo.<br />
Ceram biomaterisis ay comeortamento !Escoelim geo fortemente no<br />
linear. Sepses cases a <strong>de</strong>riva<strong>da</strong> dT/<strong>de</strong> <strong>da</strong> curve tonsao-<strong>de</strong>formacso i funsao di e, a <strong>de</strong>forms<br />
cio total do corpo Wig <strong>da</strong> usi<strong>da</strong><strong>de</strong> do sr, temp aaaaa ra, etc). Us Mikado repido pars se nadir<br />
E consist, em se apneas uma forgo <strong>de</strong> amplitu<strong>de</strong> senoi<strong>da</strong>l a &Rostra a <strong>de</strong>terminar a frequancia<br />
<strong>de</strong> reesonincia mocamica do sistema.<br />
0 .itodo fob undo pars se acompanhar a transigio alfa pars beta <strong>da</strong> queretina<br />
do tabelo human° foils isotonicamonte varisndowso a umi<strong>da</strong><strong>de</strong> relative do or. 0 efeito<br />
<strong>de</strong> produtos umidifieante ■ noses trensicio esti ■ead° investigado. Psquisa subventiona<strong>da</strong> polo<br />
Pun<strong>da</strong>cio <strong>de</strong> Apoio a <strong>Fisica</strong> a 2 Quislea.<br />
sma■■■■■=<br />
B10/9:40/66.F MUMS 011 ELETRETOS DR TEFLON POE RESSONANCIA PARAMAGNETIC@ ELETROSICA".-S11<br />
verb° Gramm ( Institut° <strong>de</strong> Pinks e Quinlea <strong>de</strong> Sao Carlos - USA).<br />
Investigamos o el <strong>de</strong> Teflon irrediedo coat Goma -Co60 st aaa a <strong>de</strong> wilds. d ■ Resmoniocia Para -<br />
megnitlem Else:antes (EPR). Daewoo aso <strong>de</strong> Teflon as forms <strong>de</strong> "espaguette". llamas is do Dosi -<br />
metro <strong>de</strong> El Ctlindrico (S. Creston& - Teee - IFQSC - USA - 1985). Carregando o eletreto <strong>de</strong><br />
dune formas difrntes - 10-0 C/0 32 ) uma cam d gm corona a outra con particulss ails, estu<strong>da</strong>mps<br />
*tunas <strong>de</strong> EPR os Escapim°. <strong>de</strong> 'trapping' a criacio <strong>de</strong> radicals Here.. A amplitu<strong>de</strong> do alma<br />
<strong>de</strong> CPR ma aaaaa sr proportional i dose <strong>de</strong> irrediseao recabl<strong>da</strong> polo Teflon. Estu<strong>da</strong>mom ninth' n ■<br />
@fatten do tramming° tirmico s a evoluedo do stool cow variacio do tempo a os prismatice resu/tados<br />
eatio ■ undo cosparados coo os obtidos por G. Dreyfus at al nos estudos <strong>de</strong> EPR realltsdo ■<br />
films, <strong>de</strong> Polypropylene bombardoados eve eletroos ( Pbye. Rev. vol I 20, pp. 1720-1724. 1979).<br />
em<br />
CNN.
CUSTALOGRAFIA<br />
Coord.:- Aldo CrolevIch (CBPF)
CRI/8:00/414.F consTRuclo DE UNA CUM'S DE READ - Yukio Roishi (Depa mmmmmm to <strong>de</strong><br />
<strong>Fisica</strong> do 1TA, CTA, Sao Jose <strong>de</strong>s Campos, SP).<br />
No estudo <strong>de</strong>s proprie<strong>da</strong><strong>de</strong> ■ es mmmmmmm ia <strong>de</strong> filmes limos per ticnicas <strong>de</strong> difra<br />
gio <strong>de</strong> taloa x, um equipameato b noteressente e a cellar' <strong>de</strong> Read' a qua'<br />
permits a exploragio <strong>de</strong> um grand. rsit° do espago recfproco, com apenes ums ex<br />
posigio.<br />
Nodificagees introduaidsa as cimara <strong>de</strong> Read' permitem <strong>de</strong>terminagees <strong>de</strong> pars<br />
metros com in<strong>de</strong>terminsglo <strong>de</strong> 3m1. Um, <strong>de</strong>s aplicageas impo <strong>da</strong>me equipsmen<br />
to e o estudo ■ <strong>de</strong> filmes fines.<br />
Apresents- <strong>de</strong> ums <strong>de</strong>ar ■ <strong>de</strong> Read am implantacio em nos<br />
so lab Le.<br />
1. N.R. READ and C. ALTNAN. Appl. Phys. L . 7. SL-52 (1965).<br />
2. S.S. QUADRI, B.J. CUBAUSEAS and R.R. CARPENTER, Rev. Sci. nostrum. S6(11)<br />
(1955).<br />
CR1/8:20/4A.F<br />
NONOCRONADOR ULTRA-FINO PARA LUZ SINCROTRON<br />
Cesar Cusatis - Dept' do <strong>Fisica</strong> - UFPR<br />
A dissipacio <strong>de</strong> energia an monocromadores pars feixas <strong>de</strong> los sincro--<br />
ton <strong>de</strong> at 2 RW/cm 2 i um problem. ain<strong>da</strong> sem aolusio i<strong>de</strong>al.<br />
0 comprimento <strong>de</strong> extingio pare <strong>de</strong>terminado comprimanto <strong>de</strong> on<strong>da</strong> a pare<br />
<strong>de</strong>termina<strong>da</strong> reflexio i <strong>da</strong> or<strong>de</strong>m <strong>de</strong> gran<strong>de</strong>sa <strong>de</strong> espessura <strong>de</strong> siIicio qua redus<br />
a intenai<strong>da</strong><strong>de</strong> do raiz, <strong>de</strong> .pens 10% dm intensi<strong>da</strong><strong>de</strong> inci<strong>de</strong>nt..<br />
Logo. an vas <strong>de</strong> utiligar-se um cristal aspens° a tenter dissipar to<strong>da</strong><br />
energia absorvI<strong>de</strong> polo monocromador. propao-se utiliaar monocrommdores ul-<br />
Lrafinoa a maior parte <strong>da</strong> energia do feixe inci<strong>de</strong>nt. at mmmmm sa o cristal<br />
em yes ao sir absorvi<strong>da</strong>. sem que a energia difsata<strong>da</strong> seja muito afeta<strong>da</strong>.<br />
Serb diacotidos metodoe pare a obtengio <strong>de</strong> cristaie aperfeitos"<br />
<strong>de</strong> ailicio com espesaura <strong>da</strong> or<strong>de</strong>m <strong>de</strong> 10 m e erase <strong>de</strong> alguns cm 2 .<br />
Apoio CAP; e FINCF<br />
CRI/13:40/4A.F RESULTARDS PRELIM1AARES OE UNA NOVA TECRICA OE 'cozen OE DUPER<br />
SAO ANOMALA con MONOCRISTAIS<br />
A. RICARDO O. RODRIGUES * I MIRED MAZUR° IUFPR).<br />
A Towle Olnemlea dm Difragio <strong>de</strong> Rmlos-X maitre qua a pica <strong>de</strong> dlfragio em<br />
ease Bragg a dslocado angularmante am relagio agusl no ciao Laos. Este dsavio<br />
d1rstamnt proportional a parte real do ?star <strong>de</strong> estrutura F o <strong>de</strong> amostra aria<br />
tallna. 'undo <strong>da</strong> ardm <strong>de</strong> segued°a <strong>de</strong> arca.<br />
Foram construldos diapositives options monecristslinos ids Silfcio <strong>de</strong> Germania'.<br />
quo prmitem difrotor o fetes inci<strong>de</strong>nts nos condigeos <strong>de</strong> Loud 8 <strong>de</strong> Oran'<br />
pilot M9006 DIMIOS elmultanerani. /Wil<strong>da</strong>s dos perils <strong>da</strong> dtfragio <strong>de</strong> embus<br />
os fenoes foram all:A<strong>de</strong>s pare odium' contort do on<strong>da</strong> do Ralen-t. obtendo-<br />
■e <strong>da</strong>b os walores <strong>de</strong> di rrrrr ea animals if'). Soren sorsntado ■ as rsultsdoe<br />
nriell.-Inaros <strong>de</strong>ists' medl<strong>da</strong>s per. a 511(cio Germ/nip<br />
dupla: Capes Fines,.<br />
* OFCm - IFUSC - USP LNLS.
CRI/9:00/4A.F<br />
CARACTERIZASE0 E SISTEMA DR ACIVISICAO DA DAMS PARA<br />
DICTATOR SEM /VIM A posicAo<br />
A. Franca Barbosa - C B P F<br />
Experiancias pars caracterizacio do <strong>de</strong>sempenho <strong>de</strong> um <strong>de</strong>tetor sensivel a<br />
posieio serio apresenta<strong>da</strong>s.. juntsmente mom um projeto <strong>de</strong> balm, custo<br />
pars a aquisigio <strong>de</strong> dsclos nesse tipo <strong>de</strong> <strong>de</strong>tetores<br />
ROVOCROMADOB MOVOIITICO DB SILICIO I QUATRO REPLEX6ES CDR SUMO<br />
O DOS IABRONICOS PARA RADzAgEo summon. zbigoimw Baran, Institute <strong>de</strong> FrsT<br />
ca. Ms.<br />
Aeletaremos breve:Lent. como calculamos a fshri aaaaa um 00000 romsdor mono<br />
Iltiao o quptro reflesOes cow alto suprespio dos harmOnicos pare radiscio sin<br />
<strong>de</strong> 4 2,29A realisado no Laborstorio <strong>de</strong> Radiagao Sincrotron, LURE<br />
-<br />
Orsay. Cortando os canals cm° paralelos no ariasl parfait° <strong>de</strong> silrcio ■ uses so<br />
perposicio dos porn@ <strong>de</strong> difracao dininica. refleti<strong>da</strong>m per <strong>da</strong>is crlstais i can<br />
valid& pars co ■<br />
harmOnicos, snquanto uses suparposicao parcisl pars um conprinen<br />
to <strong>de</strong> and. fun<strong>da</strong>mental i mesti<strong>da</strong>. o Amain fabricado, m 000000 mador coo os co<br />
amis qua faxes os ingulg ■ 10 cos o plans reflatpr (111) fornscsu um foist<br />
fun<strong>da</strong>mental <strong>de</strong> 2,291 a cam U.S taxa <strong>de</strong> 00000 minacao ds_harmonicos senor que<br />
0.41. Como esta tans foi Brands domain pars noses splicagso particular, calcu<br />
lamp ■ um segundo dor odo masse tipo man tom o piano refIstor (311). in<br />
gulp <strong>de</strong> assimetris igual i 25 a tom ■ taxa <strong>de</strong> contaminagio <strong>de</strong> apena ■ 0.081. Es<br />
to @legend° monocromador seri febries<strong>da</strong> no UPI em colahormcio tom o prof. C. Cu<br />
■ati.. Concluimo ■ qua os m 00000 omadorem monoliticoe carted°s assimetri to<br />
po<strong>de</strong>m for 00000 um feize fun<strong>da</strong>mental pouco contaminAdo per haranicom sam o use<br />
<strong>de</strong> um me ' mo <strong>de</strong> c ell <strong>de</strong> instil°.<br />
CRI/9:40/4A.F<br />
tennenviya IViS RE IM CE DISTRIPUIVM MEWS DOR SUBSIMUIVM<br />
ISOCIRPICA. GEORGE HUMBERTO BEZERRA ( )<br />
PoP. MICA MEDIIM DE ESPAIMEMD IE RAIOS-X IE EI4A VGA BINXRIA MEM. PODEMOS CETEININAR<br />
A twain DE DISIPTIRMIIO RADIAL iurAi.. Txf g A SIM CE 3 RIECI3 DE DISTRIBUI(:A0 PAPCIAIS OHS<br />
TP/141frin ring PAPPS M. AR. E RB REINA USA AX Rl ). PARA A DETERMINACAO TESSAS<br />
PAPCIAIS PPECISMT6 SNEDIIWDEEPEEMPIIES. X DEA mom rermiDIACACI EIZAVEr<br />
RRWOES PAPCIAIS EYE SER FEITA PER SIMsTriuxon rsortiRFICA ( FUSSMUIVICI EE IN ELEEENTO poll<br />
orrrPri re NRW.Pri MINIM DIFSPECTE LUIS 11E NATUREZA quir ►ocz strcuterrE ). sEIAO APREENTAEOS<br />
rum% It EVE/IRMO IN LTCA IMAM" (Zr:DnCti 011 SEIESTMUCEI IE Zr Poll Ilf IZI DIFETEMLS<br />
PORCENTAC4Mq; SERA ► AVALIAPAS AS FINITES PARCIAIS DDS PARES Zr-Zr: Zr-Ca e CU-Cu . TATS RESUL-<br />
TADOS SERi0 UPPARADOS (TM MILOS STEMMA'S TECRICOS.<br />
TnOmlho Firunciado Per: PAPER
CRI/10I1p/AA.F1<br />
tSTIJUO OAS 1RANSICOES DE FASE ES1RUTURAIS EM CONPOSTOS 00 TIPO A2NX6 POR DIFRACAO DE RAIOS X.<br />
NONE: EDNARIO ANTONIO GUINARAES COSTA<br />
wavERSTDAIXTEDERAMMIXTrir:7/15Muro DE FISICA<br />
Is here halogenetos <strong>de</strong> metal. compostos do tipo II21,5X6 (Aonetal alcalino ou molicula <strong>de</strong> aminia, N.<br />
netal a Xohalogan(o) possuem uma estrutura fcC-O (FS3mi, em altos temperatures.<br />
A maiorla <strong>de</strong>sses compostos experiments mu ou varies transicks <strong>de</strong> fase do tipo estrutural tom 0<br />
a abeixamento <strong>da</strong> temperature. A instabili<strong>da</strong><strong>de</strong><strong>da</strong> estrutura dove-se aos diferentes_raios ionicos do<br />
octaedro NX6 e do metal alcalino, bem comp as distancies interwleculeres. As varies temperaturaS<br />
<strong>de</strong> transicio sio. em geral, hem conheci<strong>da</strong>s na literature. Faltam, porim, ieformecOes sabre as istruturas<br />
resultantes <strong>de</strong> um gran<strong>de</strong> nimero <strong>de</strong>sses compoStos apps as transicies <strong>de</strong> fase e <strong>de</strong>ntre<br />
les Be<strong>de</strong>ws titer: K2ReDr6, KrTeElr6.<br />
O X2Rgpra experimenta quat.triLlIC5eS nas tesperaturaS <strong>de</strong> 269K 2S7K. 246K a 22SX. a os restate<br />
dos ootloos por espectrometr<br />
ro oa n, por si so, nao rornecem informacees a respeito <strong>de</strong>s estrutu<br />
resultantes, uma vez qua as temperatures <strong>de</strong> transicio tea valores muito erosion pare produzir so<br />
dificacoes significantes nos espectros.<br />
Para o K2TeBra sio conheci<strong>da</strong>s tres transiciel <strong>de</strong> fase nas temperatures <strong>de</strong> 4341(.405K e 234K a use<br />
'estrutura moneclinica tom grupo especial C P/21/n/ em temperature ambient*. Os estu<strong>de</strong>s por meio<br />
do espalhamento Raman pareCem - indicar uma u ra translcao estrutural, em temperature inferior a.<br />
100K.<br />
Preten<strong>de</strong>.se por melo <strong>da</strong> difracie <strong>de</strong> nips X, fornecer uma contribuicio ao entendimento <strong>de</strong>s treesi<strong>de</strong>s<br />
<strong>de</strong> fase <strong>de</strong>sses compostos buscando o esClarecimento dos pontos obscures citados. Serie espregados<br />
o mitodo po e o meta& <strong>de</strong> precessio pare monacristaiSem babas temperatures.<br />
CRI/10:35/4A.F1 TRANSBAs ESTRUPURAIS DE TAMS EN C 211144 E C23443 , Romeu A. Pereira a Aldo F.<br />
Crelevich Centro Bresiletro <strong>de</strong> Peequisom FlatcasPJAPq.<br />
Em um estudo <strong>de</strong> minim termite dIferencial (DTA) <strong>da</strong> parafinai 48(1) , canto plows carrespon<strong>de</strong>ntea<br />
a transicaes <strong>de</strong> fames forms observedos. Nos escudos par &dike° <strong>de</strong> mien X realized= ate o<br />
presente tris tranalcaes forms eseccia<strong>da</strong>s con varlacZes eatruturalm: cristal-rotador I-rotOdor Irotador<br />
II e rotedor II-liquid°. Neste tribal/1D aio pavement:Woe novos resultedos <strong>de</strong> difftgio <strong>de</strong><br />
molar remolucio correepon<strong>de</strong>ntes a C048 que permitem estabelecer as menacing estrut ►rais eseocia<br />
<strong>da</strong>m aos piece <strong>de</strong> DTA restentes. Fat estu<strong>de</strong><strong>da</strong> run amens condican tm4Min a pmrafins C 211444. (1) G.<br />
Unger, J. Chem. Phys.. 87, 689 (1983).<br />
rem a: c<br />
ossERvA00 DIRETA DA DIFRACID BRAGG-1311PERFICI E<br />
.Camoomi Inst. <strong>de</strong> Pls. Glob Wataghin - WIMP - Campine. - SP<br />
A dtfraciim maltipla dos raio.-X normalmente se refere ou a difracio tipo Bragg<br />
Bragg ou a Bragg-Laue. Neste trabalho relataremos a miteacio limits entre eaten<br />
doie camas, chamado Brawsuperacie. Na geometria <strong>de</strong> Renninger, pars produce°<br />
<strong>de</strong> &Iraqi', maltipla, a piano <strong>de</strong> incidincia primforio coinci<strong>de</strong> cos o piano do difratometro.<br />
Assim, a obeervacio <strong>da</strong> intenal<strong>da</strong><strong>de</strong> eapalha<strong>da</strong> figs contrite ao fetus<br />
primirio dtfratado.<br />
Apresentemos aqui uma nova geometria <strong>de</strong> dlErafio. em quo o piano <strong>de</strong> inci<strong>de</strong>ncia<br />
eecondirto coinci<strong>de</strong> cam o piano do difratOmetro, o quo permits a observacio direta<br />
do feixe secund5rio. Para isso, a Wink) cristalografica primirie a alinha<strong>da</strong><br />
parelelamente ao aixo b do dtfratOmetro <strong>de</strong> monocrimtal e, poeterlormente os sixes<br />
w e noio Enos em 203 pars a reflex5o secundiria. Finalmente, o n6 reciproco primArio<br />
a levado ochre a eaters <strong>de</strong> Ewald par uma rotacao xpriviamente calcula<strong>da</strong>.<br />
fiesta meneira, o Munro <strong>de</strong> feixes secun<strong>da</strong>rlos obeervavais <strong>de</strong>pend. <strong>da</strong> cimetria <strong>da</strong><br />
direcio crlstalogrifica primiria. Serio apresentados as canoe <strong>de</strong> difracio BraggsuperfIcie<br />
no Si (111) pare o caso <strong>de</strong> tree feixes (222) 41131 (000) a dole felons<br />
(113) (000). Tomb& os cases <strong>de</strong> tree feixee (400) (246) (000) a quatro feixes<br />
(400) (220) (220) (000), pars o film. InGeAsP/InP (100) crescido por LPE. Seri<br />
apreeenta<strong>da</strong> a montages experimental e discuti<strong>da</strong> a natures/1 <strong>da</strong> propagacio. (CNPq,<br />
Talebria).
■ ■■ ■<br />
CRI/11:15/4A.FIEETERMINKAO SAS FASES NA DIFRACAO DOS RAIOS-X OSANDO DIFRACAO MOL<br />
TIPLA DE NAIS OE TRES -*MIXES. Joao' Marcos Sasaki e Shih-Lin Chang (Institute,<br />
<strong>Fisica</strong> 'Glob Wataghin", Universi<strong>da</strong><strong>de</strong> Estadual <strong>de</strong> Campinas UNICAMP<br />
0 problems <strong>de</strong> fase no difracio dos raios-x fi um dos ,problemas maim importantee<br />
e atuaie ligado a cristalografia. Foram propost ■ virios mitodos experimentais<br />
para apresentar um solugio finite a mite problem. Baseado na tficnica <strong>da</strong> difracio<br />
dos raios-x juntamente cam as interagOes dinimican e Com a rotagio relativa <strong>da</strong> ro<strong>de</strong><br />
cristalina com respeito a eefera <strong>de</strong> Ewald, Chang propos em 1982 um nova tficnica<br />
para <strong>de</strong>terminagio <strong>da</strong> Fags a partir <strong>da</strong> intensi<strong>da</strong><strong>de</strong> refleti<strong>da</strong>, mando um cristal<br />
cam centro <strong>de</strong> eimetria. Uma <strong>da</strong>m gran<strong>de</strong>s dificul<strong>da</strong><strong>de</strong>s quo se aprmenta atualmente<br />
a <strong>de</strong>terminagio <strong>de</strong>s eolugio analltica <strong>da</strong> equagio <strong>de</strong> dleperaio para um caw gerai, <strong>de</strong><br />
N-feixes. Ao expan4ir a equagio <strong>de</strong> dispersao na forma matricial, produtos <strong>de</strong><br />
N-1, N-2, ...,3 (N 3) fatOres <strong>de</strong> estrutura a polarixagOes aparecem naturalmente.<br />
Ca<strong>da</strong> um dosses produtos <strong>de</strong> fatores <strong>de</strong> estrutura correspon<strong>de</strong> no espago reciproco a<br />
um poligono fechado. Propomos nests trebalho, o estudo dos problema <strong>da</strong> fase tratan<br />
do geometricamente co<strong>da</strong> caso <strong>de</strong> difragio<br />
<strong>de</strong><br />
N,<br />
atraves <strong>da</strong> <strong>de</strong>composicio em poll=<br />
gonos fechados, aempre respeitando a conservagao <strong>de</strong> momenta. A teoria dinimica <strong>da</strong><br />
difracio dos rains-x juntamente com a aniline <strong>da</strong> easimetria do perEii <strong>de</strong> linha,rotagio<br />
do cristal no °space reciproco e o efaito <strong>de</strong> palarixacio, foram oe parimetros<br />
utilizados para se chegar a uma nova expressio pare o mini <strong>da</strong> lase invariante.<br />
Na parte experimental fai utilixado radiacio cujo comprimento <strong>de</strong> on<strong>da</strong> se aitua<br />
acima <strong>da</strong> bor<strong>da</strong> <strong>de</strong> abaorgio do item macs pesado conatituinte do cristal. (CNPq -<br />
TELEBRAS)<br />
CRI/11.35/4A.F I INFRARED OPTICAL PROPERTIES AND VIBRATIONAL STRUCTURE IN SINGLE<br />
CRYSTALS OF Ballre(CN)5 1101.3N20. By 0.E. Piro, Dept* <strong>de</strong> P . , reed <strong>de</strong> C.Exactas<br />
(FCE), Univ. <strong>Nacional</strong> <strong>de</strong> La Plata, (11111.P). C.C.67, 1900 Le Plata. Argeqtina. E.E.<br />
Castellano, I <strong>de</strong> F' litanies <strong>de</strong> Sio Carlos. Univ. <strong>de</strong> Sio Paulo, C.P.<br />
369. 13.560 Sio Caxton. Brasil. S.A. Gonziles and P.J. Aymonino. Dept° <strong>de</strong> 011iniea.<br />
TCE. MILD.<br />
The values of the optical parameters along the crystal axis are oh d by<br />
Kramers-troeig dispersion relations analysis from the t 1-elastic<br />
raft gpectra on the (001) crystal face of tho title compound. in the range<br />
250-3000 cm". These values are used to <strong>de</strong>termine the transversal and longitudinal<br />
vibrational frequencies of the g optic NO ping mo<strong>de</strong> and are also<br />
employed to predict the position and shape of the NO re ttttt 'hien band for<br />
l magnetic off-axis reflectance on the crystal (100) face. A<br />
least sq fitting to the experimental reflectance based on a classical <strong>da</strong>mped<br />
b is oscillator in the NO king region, provi<strong>de</strong>s an estimation of the<br />
transition strength of this intramoleculer vibration, which is in good air<br />
with the value <strong>de</strong>rived from apeetroscopic effects due to intermolgculgr<br />
dipole-dipole i tttttt title between NO vibrations is Ballve(CN)5 11( 1.0,"0)1.31120<br />
and SriFe(C11)5 N( 160, 100)1.41120 isotropic mi (Comfits:, Piro, Aynonino and<br />
Castellano, Phys. Bev., 1986. 11 22. 58111-51124).<br />
C3!/11:55/4A F l OPTICAL PROPERTIES, REFLECTANCE AND TRANSMITTANCE or ANISOTR0PIC<br />
ABSOalizem CRYSTAL PLATES. O.E. Piro, Physics Dept. of MSC. USP and of UNLP,<br />
Argentina.<br />
The optical properties of gly absorbing orthorhombic (and higher symmetric,<br />
ulliexial) crystals are consi<strong>de</strong>red. Expressions for the amplitu<strong>de</strong> reflection and<br />
mission coeffi ' to of crystal plates with smooth surfaces parallel to<br />
p ' 'pal planes are p ttttt ted Equations for the refle t d ■ ittance<br />
o f crystal 1 aaaaa with rough surfaces are also <strong>de</strong>rived. The exp eeee ions are<br />
p tad in ■ form that facilitates their comp ee ' 1 implementation and their<br />
ready comparison with the known formulas corresponding to films of isotropic<br />
media. The practical interest of the <strong>de</strong>rived equations for their applicationa in<br />
.<br />
■b p py of solids emph ' d. A <strong>de</strong>tailed, quantitative<br />
d 'ptien of the contribution to the TM -pot ' d, off axis in e d absorption<br />
spectrum of anisotropic 1 plates due to polar longitudinal optic vibrational<br />
will be Riven.
CRI/III90/5A F UNA NOVA UNIDADE DE ESPALNAMENTO NA DIFRACAO DINAKICA DE RAIOS-I<br />
H.S.Cam pa a W.A.Seller - Institute <strong>de</strong> <strong>Fisica</strong>,Universi<strong>da</strong><strong>de</strong> Fedora<br />
<strong>de</strong> Da ia.<br />
Um piano <strong>de</strong> dipole ■ indundo ■ i consi<strong>de</strong>red° come uma uni<strong>da</strong><strong>de</strong> bi<strong>de</strong>s <strong>de</strong> espelbameet°<br />
dinimico <strong>de</strong> relos-X, no me <strong>de</strong> dots felses. Como use extensio <strong>de</strong> uni<strong>da</strong><strong>de</strong><br />
forma<strong>de</strong> par um inico dipole, a uni<strong>da</strong><strong>de</strong> introdusids mantis o principle <strong>da</strong> autoconsistincia<br />
<strong>de</strong> Eveld alts <strong>de</strong> lever em cants a conservagio <strong>de</strong> allergia. De imediato<br />
si o ccc <strong>de</strong>s algum ticee do espelhamento dinimico usualmente<br />
d cccc itos pars todo um arisen. Definindo-s ■ no "couple. tie point" I <strong>de</strong>rived°<br />
analitica eeeee um comportamento hiperbilLeo com vs 'altos an fess, pre os @sta<strong>de</strong>s<br />
coejugados <strong>de</strong> vibragio. 0 tratemento matemitice <strong>da</strong>m <strong>de</strong>rtvegio e exteadido<br />
pare a regiio <strong>de</strong> espalhanento cinemitico. A equivalincia entre a auto-consieeinels<br />
e con eeeee gio <strong>de</strong> energia i proved. <strong>de</strong> ambits maestros.<br />
hApoLo !Luminaire CAPq e FINEP<br />
CRIIII:20/5A.F<br />
AUTO-CONSISTINCIA S CONSERVAGIO PA ENEMA NO ESPALHAKENTO<br />
ELETROMAGNITICO DR DUAS ONDAS - W.A. Kellar. Institute <strong>de</strong><br />
<strong>Fisica</strong>, Univermi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>da</strong><br />
0 espalbemento <strong>de</strong> dues Gli<strong>de</strong>s eletromagnitiems plane" per um piano <strong>de</strong> dipoles<br />
indusido ■ a rigoromamente tratedo com use do vicar <strong>de</strong> Herts. d mostestio qua<br />
smaeute was solugao auto-consi ee eee WIG lava em cont ■ afeitor cooperatives entre<br />
OS dipoles ■ results ua conmerviegao <strong>da</strong> energia. Atraveaa <strong>de</strong> coeficLeutes complexes<br />
<strong>de</strong> a<strong>da</strong>gio ado <strong>de</strong>fini<strong>da</strong>s as graduate vanagees <strong>de</strong> amplitu<strong>de</strong> a <strong>de</strong> fame pare as<br />
dues °o<strong>de</strong>s espalba<strong>da</strong>s. Consi<strong>de</strong>ramdo dots @stadi ■ <strong>de</strong> vibrageo, quer dim, as °e<strong>da</strong> ■<br />
inci<strong>de</strong>nces &nesse o plane <strong>de</strong> dipoles an lase a com Eases °porta., oscorrespoo<strong>de</strong>ntes<br />
salsa' em fag' reviles um comportment° idintico ao previsto no teens din:Elva <strong>de</strong><br />
difragio <strong>de</strong> raies-X. Entretanto come a relegio entre MOO estado ■ i <strong>da</strong>rivad ■<br />
exclusivamente na fore ■ aaalitica, a use coavenclonal <strong>de</strong> ■rim:genies geometrical a<br />
<strong>de</strong> so<strong>da</strong>s esfirica ■ tarns-se aqui redun<strong>da</strong>nte.-<br />
Apolo finaoceiro CNPq a FINEP<br />
CRI/!1:40/5A.F<br />
MAXINUN LIREHOOD DETERMINATION OF PARAMETERS FOR POWDER, LAUE AND<br />
DIVERGENT BEAN PATTERNS - Mined Ratajczyk and W.A.Keller.<br />
Institute <strong>de</strong> <strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>da</strong> Bair-<br />
A general approach for any experimental amusement is <strong>de</strong>veloped in which a<br />
number of directly measured magnitu<strong>de</strong>s or <strong>da</strong>ta is used to calculate a substantially<br />
smaller number of permit eeeee consi<strong>de</strong>red as results. A macbematicel mo<strong>de</strong>l of expert<br />
meet is set up which enables one eeeeatLel reverse calculations of the "theoric"<br />
',slues of the whole <strong>da</strong>ta set. Same additional p e are necessarily introdu-<br />
ced to complete the mathematical mo<strong>de</strong>l. The calculations are teethed by a<br />
eal procedure unique for the 'apartment of Luterest. Convergence of the procedure<br />
is checked by a minimum variance enteritis based on the assumptive of the permit<br />
distribution of all the measured magnitu<strong>de</strong>s. For each particular <strong>da</strong>ta set ■ linear<br />
statistical mo<strong>de</strong>l is postulated. The maximum likabood or "best" values of all the<br />
parameters together with their stan<strong>da</strong>rd <strong>de</strong>viation are <strong>de</strong>fined un<strong>de</strong>r validity of<br />
the linear mo<strong>de</strong>l. The limit value of the variance sets the It precision<br />
effectively attained in the particular real' ion of the experiment. The procedure<br />
has been applied for the pow<strong>de</strong>r, Latta and divergent beam tecniques.<br />
4 Partially supported by FINEP<br />
t-
CRI/9:00/5A.F ESTRUTURA CRISTALINA DO FOSFATO FERRIC° DI-XCIDO.<br />
I. vencato (Depto. P(sice-UFSC), E. Nattlevich e Ligin <strong>de</strong> F. Horeira (IF-UFAJ)<br />
e T. P. Nascarenhas (IFQSC-USP)<br />
0 compost° sintetico Fe 3. (PO4 /1 2 ) 2 (011) i monoclinic°, grupo especial P2 1 /c,<br />
a 5,191(2), b 8,748(2), c 14,448(2)/1,0 - 94,81(2) ° , Z ■ 4, dc 2,69 g.cm-3<br />
✓ . 653,79 R 3 p ■ 26,62 cm -1 .<br />
Poi utilized° um cristol rose clam <strong>de</strong> dimensees 0,35x0,08x0,06 mm', medindo-se<br />
1140 reflex8es com um difratilmetro automatic° CAD-4 e radtecoo Hoke<br />
Foi faits correcio por Lp e por extincio secundiria. A estrutura foi resolvi<strong>da</strong><br />
por Nitodos Diretos com HULTAN-80 e refina<strong>da</strong> por minimos quadrados ate o fnclice<br />
B 0,058 pare 976 reflexies obsorva<strong>da</strong>q.com I) 3o(I).<br />
A estrutura consists <strong>de</strong> ions <strong>de</strong> Fe coor<strong>de</strong>nsdos per ligantes (P0 H 2 )<br />
formando octaedros sue se conectam entre si atraves dos vertices <strong>de</strong> grupds Eosfates.<br />
0 grupo (OH) Wire encontra-se ligado por irate <strong>de</strong> hicirogenio ■ um oxigenie<br />
do um grupo fosfato foto s sue presence foi infer <strong>de</strong> por espectroscopia do in.<br />
fravermelho com frequincia <strong>de</strong> estiramento 3392 cm .<br />
drgios financiadores: CAPES, FAPESP, CNPq(PADCT) e F1NEP.<br />
rn1/9:20/5A.F<br />
X-RAY ABSORPTION SPECTROSCOPY APPLIED TO THE CHARACTERIZATION<br />
OF CATALYSTS<br />
H. DEXPERT, D. BAZIN, F. LE Nottrhutp, P. LAGARDE<br />
LURE. Bit. 209D, UPS, 91405 ORSAY, FRANCE<br />
In the field of highly dispersed heterogeneous catalysts, EXAFS is to <strong>da</strong>y<br />
en important technique very largely used. Using a <strong>de</strong>dicated experimental cell<br />
we are studying some of these materials, basically ma<strong>de</strong> of platinum on<br />
alumina, directly un<strong>de</strong>r reactive Conditions, et high temperature, either during<br />
different oxi<strong>da</strong>tion reduction cycles or while several catalytic<br />
transformations are performed. Both conventional and time resolved<br />
experiments were un<strong>de</strong>rtaken so that the kinetics of the structural and<br />
electronic evolutions of these catalysts are followed. These new results<br />
<strong>de</strong>fine more accurately the relationships between the metallic egregate and its<br />
environment. Particular features such as the influences of the nature of the<br />
precursor and the metal loading, the temperature and time <strong>de</strong>pen<strong>de</strong>nce of the<br />
reaction, the correlation between the particles size and the chemical<br />
compounds issued from the reaction will be discussed.<br />
CRI/9:a0/5A.F f ESTUDO DO SISTZMA Pd-HIDROGINIO POR EXAM. L.P.Cardoso e M.Pick,<br />
Brookhaven National Laboratory, Upton, New York 11973.<br />
O itomo <strong>de</strong> Ilidroginio com apenas um elitron nio produs retroespalhamento mensuravel<br />
por EXAFS (Espectroacopia <strong>de</strong> Absorvio <strong>de</strong> Raioa-81, o quo dificulta a sue lace-<br />
Usage° na redo cristalina, por este tecnica. Entretanto. mostrou-se recentemente<br />
(H.Lengeler, Phys.Rev. Lett.(1984) 53, 74) qua, quando o Hidroglenio coupe <strong>de</strong>terral<br />
na<strong>da</strong> posicio na ro<strong>de</strong>, como a o caso no Ni (tattoo octaedricos), sue presence po<strong>de</strong><br />
ser <strong>de</strong>teta<strong>da</strong> por curs. Nesse case. 0 itomo <strong>de</strong> H atua como uma lente, provocando<br />
um acrEecimo na amplitu<strong>de</strong> e <strong>de</strong>slocamento na fame <strong>da</strong> on<strong>da</strong> do fotoeleStron retroespa<br />
lhado eelos segundos vizinhos, quando emus on<strong>da</strong> passe' polo potencial criado pelo<br />
N. 0 metodo permit. obter informacio radial a angular do eftio do ro<strong>de</strong> ocupado pe<br />
lo if, o qua Leva a sue localizacio.<br />
Nesse trabalho, see analise<strong>da</strong>s amostrae <strong>de</strong> Pd eletrollticamento carrega<strong>da</strong>a com H.<br />
Apemar do ser um sista= clistInto do Ni, o Pd apreaenta semmlhanca do ro<strong>de</strong> (fcc)<br />
aliado ao gran<strong>de</strong> intereese no estudo <strong>da</strong> hLdrogenacio douse metal. Soria dlecutidos<br />
os resultados obtidos a pectic- <strong>de</strong>s analises <strong>de</strong> EXAFS. No moment°, estamos empenhadoe<br />
na elaboraceo <strong>de</strong> um mo<strong>de</strong>lo pare explicar alguns dos resultados caracterfsticos<br />
ao slstema sob estudo. (CNN).<br />
En<strong>de</strong>reco permanenter Institute <strong>de</strong> <strong>Fisica</strong>- UN1C8M1*. 13081. Campinae, Sio Paulo.
E171/10:15/511.F ESTUDO DA POROSIDADS E GEOMETRIA FRACTAL DE CARO° VEGETAL TRA<br />
TADO TERNICAKENTE. J.C. <strong>de</strong> Sousa, Fun<strong>da</strong>cio Universi<strong>da</strong><strong>de</strong> Eatadtual <strong>de</strong> Raring: -<br />
Iris L. Torriani a C.A. Luang*. Instituto <strong>de</strong> <strong>Fisica</strong>, UNICAMP.<br />
Curvas <strong>de</strong> espalhamento <strong>de</strong> rains X a baixo angulo foram obti<strong>da</strong>s pare mantras<br />
<strong>de</strong> carvao vegetal (pine elliotti) trata<strong>da</strong>s tarmicamente entre 600 a 2100<br />
IC. As intensi<strong>da</strong><strong>de</strong>s espalha<strong>da</strong>s, <strong>de</strong>termina<strong>da</strong>s on eseala abnoluts ■ foram utill<br />
sa<strong>da</strong>. para obter a distribuigio <strong>de</strong> tamanhoe <strong>de</strong> pores e a area superficial interns<br />
<strong>de</strong>s amootran.<br />
0 ajuate e mattes <strong>de</strong>talha<strong>da</strong> doe curves <strong>de</strong> eapalhamento permit. o calculi<br />
<strong>de</strong> dImensio fractal <strong>da</strong> supernal' interfacial do sistema <strong>de</strong> pores cam a matrix<br />
earbonom. Estes eileulos. que rustic nendo reallaados para as @mantras eubmsti<strong>da</strong>s<br />
a tratamento termico. <strong>de</strong>veric proporcionar informal° sabre a evolucio <strong>da</strong><br />
estruture <strong>de</strong> microporos a <strong>da</strong> supernale interfacial mate tipo <strong>de</strong> material earbanana.<br />
CAPES. CNPq, FINEP.<br />
G /10:35/5;71 cut= DE AMMO) DE SOLS DE SILICALT. Laura a J. Zarmyckl, Miversiti <strong>da</strong><br />
Montpellier. A. Cralevich, Centro Brasileiro <strong>de</strong> Promise' Flakes. Rio <strong>de</strong> Janeiro. D, dos Santos e<br />
M. Aegerter. institute <strong>de</strong> Fir:Moe (biota& <strong>de</strong> Sip Carlos.<br />
Amnon rotun<strong>da</strong>s solugges <strong>de</strong> INS e ague em netanol a portir dos primeiron estigioe do agrnpneio<br />
do MOS paradiverasscomentroiiesememlicaes kid= e beams, mdiante a temica <strong>de</strong> espalha-<br />
@onto <strong>de</strong> rules X a balms utilizando um !tote <strong>de</strong> realm& sincrotron (LURE). lb satin<br />
sealquantitatIvo <strong>da</strong> verlacio do rain do &Sao dos wagons mantra que ales ne forms polo prom=<br />
alembio <strong>de</strong> dinrsio. Os agregados is eatruturas fractal§ cam dboonslonalindo D4,1 nor so<br />
hems ;midge a 0.2,6 nee oolucies bislang. As corms <strong>de</strong> espelhanento Imports,: claimant, 0 mo<strong>de</strong>l+)<br />
(metal <strong>de</strong> est:tutu:a mom pars as estados Minced= <strong>de</strong> efIreflecim-<br />
CRI/10:55/5A URA DE GEIS DE SILICA UMIDOS. A. Cralevich, Centro Brosileiro <strong>de</strong> Pesquims<br />
Finless. Rio <strong>de</strong> Janeiro, D. dos Santos e K. AeRerter, Institute <strong>de</strong> <strong>Fisica</strong> a QUimica <strong>de</strong> Sic Carlos.<br />
T. Lours et J. Zarayeki. Universiti <strong>de</strong> Montpellier.<br />
Gels <strong>de</strong> silica preparodos a partir <strong>da</strong>hldn'ilise <strong>de</strong> mimics <strong>de</strong> INDS dissolvido an meta of farm as<br />
tu<strong>da</strong>dos por escalhamento <strong>de</strong> race X a balms &mulcts atilt:Ando ranagio sineretran (LURE). Om estudos<br />
feitos nos gels ZaJdoe nostrum que a polimeriamio don= prong estruturas [recta's <strong>de</strong> volume<br />
ou <strong>de</strong> superficie, <strong>de</strong>pen<strong>de</strong>ndo do ph a <strong>da</strong>prmmocio4gps/11405. Os gels icicles tea estrutmas<br />
<strong>de</strong> mime fractal can Os gels bathos can alto conteudo <strong>de</strong> hoc. volume fractais acs Dv<br />
2.6. Para vie bit:fleas os reaultodos spa eonsistentes can usa estruturs [arma<strong>da</strong> per uni<strong>da</strong><strong>de</strong>s <strong>de</strong><br />
redo R m ■13 A. 0 envelheehmento dos gels preduz c allaamento gradual <strong>de</strong>s auperfieles !metals.
11:15/SA .F ESTUDO DE KICELAS EN SOLO& NO SISIDIA 00DECIL(LAURIL1 SULFATO DE SONO (SLS)<br />
EN ACOA FOR ESPALKAKOM) DE RAIOS-X EliSAIXO GULO (SAIS): Rosangela ltri e Lie Queiros<br />
Amaral (Iostituto <strong>de</strong> <strong>Fisica</strong> Ms USP)<br />
Estu<strong>da</strong>mos amo bin: r i aa isotrapicas ow viries concentregies <strong>de</strong>eds 4,921 <strong>de</strong> SLS a<br />
26,251 <strong>de</strong> SLS. As curves <strong>de</strong> espalhamento ate concentragio <strong>de</strong> 151 <strong>de</strong> SLS ap aaaaa Cam um ;nice pica<br />
mmmmm garrotte° <strong>da</strong> fungio <strong>de</strong> inter( is interne <strong>da</strong> micela. Efeitos <strong>de</strong> interferincia antra part;<br />
colas at ease con rrrrr nip "feul a curve <strong>de</strong> SAES <strong>de</strong> use mimics Rerceptrvel. Da mills. <strong>da</strong><br />
Fong, astudo do Eaton <strong>de</strong> estrutura <strong>da</strong> funsio <strong>de</strong> distribuicio <strong>de</strong> distencia p(r), conclmimos<br />
qua nti a concentraqio <strong>de</strong> 102 <strong>de</strong> SLS as mIcelam min emfirices cam raio total <strong>de</strong> or<strong>de</strong>m <strong>de</strong> 25,511.<br />
Para Roomed cam conceatracoe ■ majors. que 152 <strong>de</strong> SLS, observamos o apareciemoto <strong>de</strong> um<br />
segundo rico que me torn" nether <strong>de</strong>finido quanta maior e concentracio <strong>de</strong> enfifilico, essociado<br />
Interfarencie entre similes. Da.anilise <strong>da</strong> omelets° dos picas cam s concentraqao concIulmos qua<br />
nee 'mists indicaqao <strong>de</strong> alterageo <strong>de</strong> forma <strong>da</strong> micela ea a cccccc trivia <strong>de</strong> 26 1252 <strong>de</strong> SLS, man ape<br />
nas a surgimento <strong>de</strong> interlaces entre Riegle' e um pa 1 imams= do agregaquo extra e1am. A poi<br />
sibili<strong>da</strong><strong>de</strong> is transigio <strong>de</strong> forma esfera-cilindro ser mediaa pole formaqie <strong>de</strong> diner*s <strong>de</strong> micelii<br />
parses Instants viivel.<br />
011/11:35/5A.F I SAKS STUDIES OF CROTAKINE SOLUTIONS AT 01 ■4.5. J.R. Oeltreq, Y.P. Itasca -<br />
renham, A.F. Cr51evic2.(lostituto <strong>de</strong> P' ' Quimica <strong>de</strong> Kio Curios, C.P. 369, 13.360, Sio Car-<br />
los', SP, Brasil and C.J.Lurg, Vac. <strong>de</strong> Ned. <strong>de</strong> Rib ' Preto, Si° Paulo, brazil).<br />
Crotamine. a neuratoxia isolated from the brzilian raelemnake Crotelus durimses<br />
terrificum, is a polypepti<strong>de</strong> toxin strongly basic (pHi 10.3) with Al residue. of common emin2_<br />
acids including six heIfeystines. It has very high lysine (9 residual) and low evening (2<br />
;residues) . The W -terminal is tyrosine and C-terminus glycine. It has been sequenced by<br />
J.C. Laura (Hoppe-SeyIer's Physiol. Chem. 213-215 (1975) who also localized the four<br />
.cystine bridge. (Collected Abst., SIIPC, Annual Nest., 19801. In preview' work (liophys. J. Ai.<br />
ljan. 1985. 13-33) we <strong>de</strong>termined the apparent radii of gyration as f ' I pH. la this work<br />
I re ob ' d the SAES curves at pH 4.5 and the following molecular perimeters could be <strong>de</strong>rived<br />
radio" of oral= ■ 15.3(6) A, .ax. dim. ■ 40.0(2) A. volume ■ 20200 13 , surface 3200 12 .<br />
From this <strong>da</strong>ta we bad the indication that the molecular shops should be of a oblate a1ipsoid<br />
with a ■ b 22.8 A. c 8.4 I v a cis 0.37 . Using O. Glitter program the pair dimtribution<br />
function wee calculated ant the found was not that expected for a perfect oblate<br />
ellipsoid. A molecular mo<strong>de</strong>l was then proposed taking in consi<strong>de</strong>ration a rough Wimps as<br />
suggested by the secon<strong>da</strong>ry ■tructur ■ predicted by Chou and Ferman and hydrofobicity profile'<br />
methods. Work spo d by CNN. FAPESP and FINE?.<br />
CRI/11:55/54.FIEST0O0 E CARACTERIZAGA0 OE ESPIERALDAS OE SANTA 7EREZIIIHA DE GOIAS<br />
Carlito Lariucc (Oepartamento <strong>de</strong> <strong>Fisica</strong> - UFG) e Regina Helena <strong>de</strong> Almei<strong>da</strong> Santos (Instituto <strong>de</strong><br />
1.1sica a guimica <strong>de</strong> Sao Carlos - USP)<br />
A seguincia ao trabalho iniciado em 1985, sobre esmeral<strong>da</strong>s <strong>de</strong> Santa Terezinha <strong>de</strong> Golfs,<br />
levou a obtencao dos resultados aqui expostos.<br />
As medi<strong>da</strong>s do Tndice <strong>de</strong> refracio, usando o Mitodo <strong>de</strong> imersio resultaram em: n e n aeriando<br />
<strong>de</strong> 1.515 a 1.585 a 1.590 a 1,600, respectivamente.<br />
e o<br />
Os parimetros cristalogrificos<br />
0<br />
isao: a ■b■9.2837(7). c9.2092(4)R, 11=687.8(3)n 2.2 solicu<br />
las poe cela unitiria. d"..2,750(5)g/cm- , grupo especial P,/mcc. sisteam cristalino Hexagonal. A7<br />
resoluclo <strong>da</strong> estruture Idfdu localizacio <strong>de</strong> uma mplicula <strong>de</strong> igua na posicio (0. 0. 1/4) e um on<br />
(Ns, Ca, ...) na posicio (0, O. 0). As principals distincias interatomicas encontra<strong>da</strong>s foram:<br />
A1-0(2) ■ 1.947(1), Be-0(2) ■ 1,654(1), 5i-0(1) 1.618(I). Si-0(2) ■ 1,608(1) e (Na, ca. ...)-0.<br />
2.302(1) A.<br />
0 alominio tem coor<strong>de</strong>nacio octaidrice enguanto qua o berillo e silicio tetraidrIca.<br />
Com o objetivo <strong>de</strong> verificar qual Ton este coor<strong>de</strong>nado a igua. recorreu-se a anilise quTmi<br />
ca complete. a qual encontra-se em an<strong>da</strong>mento.<br />
Orgios Flnanciadores: CAPES, CNN, FIMEP, FAPESP.
DEFEITOS, CRESCINENTO E CARACTERIZACAO DE CRISTAIS -<br />
Coon:I.:- Spero Penhe Norato (IPEN)
DEFEITOS SUPERFICIAIS DE ORIGEN EXTRINSECA OBSERVADOS EM FILMES FINDS<br />
DE GaAs CRESCIDOS PELA TiCNICA DE EPITAXIA POR FEIXE MOLECULAR.<br />
Marcus Viniclus Beets Moruilra e Alfredo Gontijo <strong>de</strong> Oliveira<br />
Depto. <strong>de</strong> <strong>Fisica</strong> - VFW<br />
Defettos superficiala <strong>de</strong> origem extrinseca em condole <strong>de</strong> GaAs creaci<strong>da</strong>s<br />
vela tecntca do epltaela por fetes molecular foram observados utiltaen-<br />
do um microscopic Otico <strong>de</strong> contrate <strong>de</strong> fuse e microscopie eletranica <strong>de</strong><br />
varredura (SEM). Foram i<strong>de</strong>ntificados uma eerie <strong>de</strong> <strong>de</strong>feitoe tale coma<br />
"whiskera","hillocka m , ellimmil<strong>de</strong>a (20 a ISO pm . <strong>de</strong> semi-eixo motor e 15<br />
a 65 pm <strong>de</strong> semi-also manor) e <strong>de</strong>feitos ovals (tree tipoa . <strong>de</strong> varie<strong>da</strong><strong>de</strong>s;<br />
tom nucleo macroaCapico. com buraco a nem buraco). Urns aminee semiquantitative<br />
pot, Otero-son<strong>de</strong> revelou qua enquanto as "Mhialtera m . ellpmol<strong>de</strong>m<br />
a <strong>de</strong>feltos ovals com nucleo orlairom-ae <strong>de</strong> particulaa contmainentea.<br />
oe <strong>de</strong>feltoe ovals tom e sem buraco a "hillocks" parecem originar-se<br />
<strong>de</strong>e condicaes <strong>de</strong> crescimento e/ou particulas microecOpicas.<br />
9WS:20/4A.F 17CRESCIMMTO DE SETEMESTIDTGIAS DE GaIn xiie/GaInvAs PEXA 112CNICA<br />
MVPS A BAIXA PRESSAO. - Marco A.Sacilotti a Aldionso M.Machado (010.-TELIERA0),<br />
Ramo A.Masut (NRC-CANADA).<br />
HOPPE (Metal-organic vapour-phase epitaxy) 8 uma ticnIca <strong>de</strong> crescimento muito<br />
importante, atualmente, pars o crescimento <strong>de</strong> cama<strong>da</strong>s epitasiale cam interfaces<br />
bastante abruptas quo sejan <strong>da</strong> or<strong>de</strong>m<strong>de</strong> 2-3 monocama<strong>da</strong>e atemicae. Reteroestruturas<br />
tensioned's <strong>de</strong> GeAs/GaInyAs sabre substrate, <strong>de</strong> GaAs e GaInzAelGaInvAs sabre<br />
substrates <strong>de</strong> InP foram crescidos palw.ticnica MOVP11 i balsa pressao (40 tort). .<br />
Apresentamos nests trabalho as <strong>de</strong>talhas <strong>de</strong>nte tecnica <strong>de</strong> crescimento, assim cono<br />
alguns resultadoe <strong>de</strong> catacterizaciO em an<strong>da</strong>piento qua englobam Auger, fotalumiinumencia,<br />
<strong>de</strong>ebaete em ingulo,.etc.<br />
DEF/13:40/4A F r:1711E1-0EDES 08 DOPACENS Ex SENICONDOTORES PREPARADAS POE mai — Ivan Fre<strong>de</strong>riee<br />
Lu lamp Dias Alfredo Gentile dm Oliveira - 0olvermi<strong>de</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Mess GamicDepartment°<br />
e Y ace<br />
Super -re<strong>de</strong>m por domes' elm materials aselemadutorso III-4 sae' secretes., obti<strong>da</strong>s polo legato<br />
periodics dA samosas mita floss (10 - 300 1) <strong>de</strong> elm lige (GaAs) cam alters:Male dm <strong>de</strong>poses<br />
tip* .(Sin tipo pale). As realise dcergil eepacisl resultants' pravocas mea modmiscio doe Ma-<br />
dge <strong>de</strong> emerald <strong>de</strong>ed° arises ■ ite "asp <strong>de</strong> miergia Indira.) no @space real" s ma coosequiecia ea por<br />
ce<strong>da</strong>rs. dm cares Hose - lerrons b sio empecielmente separedom sesta& mu distribuicio<br />
em nio equilibria mete " 1. loco tem laplicaciies diverse mobrs as proprie<strong>da</strong><strong>de</strong>m eletricas s it4<br />
rue do qmentidmdso come ■ concentracio <strong>de</strong> porta<strong>de</strong>res. o gap <strong>de</strong> emergi. a condutivi<strong>da</strong><strong>de</strong><br />
etc. cornea-se pintos's:mete por spliced:a <strong>de</strong> elm voltages external ou par mmitetio 61105. Semmes<br />
ream' am evidipcias experiments's dm ■ intoniaablli<strong>de</strong><strong>de</strong> <strong>de</strong> alemmas carts* quanti<strong>da</strong><strong>de</strong>e.
DEF/ 921<br />
CRESCIMENTO IMITAXIAL DP LICA Ini_ xGaxAsylb2-y EM SUPERFTCIES NAO<br />
PLANARES°. Nilson Carvalho Jr. a Jose R. Canso - 0401-TSLCBRAS-13.0135-Campinas-<br />
SP.<br />
0 <strong>de</strong>senvolvimento <strong>de</strong> tecnicas <strong>de</strong> crescimento <strong>de</strong> cama<strong>da</strong>s cristalinas cobra<br />
aubstratos nio planares a multo importante pare a Eabricacio <strong>de</strong> lasers tipo cama<strong>da</strong><br />
enterra<strong>da</strong>.<br />
No presente trabalho, mostraremos resultados preliminares na obtencio <strong>de</strong> estrutura<br />
enterra<strong>da</strong> tipo VSEI (V-groove substrate buried). Serio diccutidoc os ate) -<br />
gues guimicos pars former a V no substrata a as tecnicas <strong>de</strong> crescimento por apt -<br />
taxla <strong>de</strong> face lfgui<strong>da</strong>.<br />
DEF/9:20/4A.F PORES& DOS REAGENTES 8 CARACTER/ST/CAS RUTRICAS 8 OTICAS DE<br />
CAMAOAS CPITAXIAIS III -V CRESCIDAS FOR MOCVD. - league A.Mala. In Joakes Unstituto<br />
<strong>de</strong> pulmica-UNICAMPI, Aldionso M.Machado. Marco A. Sacilotti (CND-TELE:BRAS).<br />
O MOCVD (Metal Organic Chemical vapour Deposition) 8 uma ticnIca <strong>de</strong> crescimento<br />
epitaxial qua consists essencialmente <strong>da</strong> pin:aims <strong>de</strong> organometilicos do grupo /II<br />
Pau V) a hidretoe do grupo V sobre um aubstrato aguecido. A purees <strong>de</strong>sses reagentes,<br />
no entanto, a uma saris limitacio <strong>de</strong>nse a <strong>de</strong> outran tecnicas similares, tail<br />
come o CBS a o MONDE.<br />
A instabili<strong>da</strong><strong>de</strong> doe organometelicos na presence d! 02 a 1120, a dificul<strong>da</strong><strong>de</strong> <strong>de</strong><br />
ohte -los a manta-log puree durante a sue utilizacao a a neceesi<strong>da</strong><strong>de</strong> <strong>de</strong> sofistica<strong>da</strong>s<br />
tecnicas pars a dosagem <strong>de</strong> impuresas ao nivel <strong>de</strong> tracos mio dificul<strong>da</strong><strong>de</strong>s pars<br />
o crescimento <strong>de</strong> ligas /II -V <strong>de</strong> alts paresis.<br />
Mesta trabalho procuraremos correlacionar as puremae dos reagentes a <strong>da</strong>p camados<br />
epitazialsutiligando <strong>da</strong>dos obtidoa do crescimento <strong>de</strong> GaAs num sistema MOCVD -<br />
Pressio atmosfarica a caracterizacio elitrica a Otica com efeito hall, polaron e<br />
fotoluminescencia.<br />
DEF/9:40/4A.F 1 ''moo rprvinAL re i40.53c00.47A5 raft ISE' - P.J.Shieh -<br />
CIND-IIMENRIS - Carpi me-6P.<br />
Cambria <strong>de</strong> =aka sea dm Interesse na sus aphasia° em foho<strong>de</strong>tatores pars sistemas <strong>de</strong><br />
ommicacees apticas. are issoos criseais precise» tar use alts purara (dm or<strong>de</strong>m <strong>de</strong> 1015 parta<strong>da</strong>mas par cm?). Atraviscbmitodo <strong>da</strong> Epitaxie per Face Ilgul<strong>da</strong> (1111), estamas oanseguin<br />
do obter cre<strong>da</strong>l apiteebeis dm IrGalks <strong>de</strong> &ion morfclogia a concentrageo <strong>de</strong>_rortadoxes do or-<br />
Zem <strong>de</strong> 1015 cm-J. As cuestas sae cresci<strong>da</strong>s oboe substrato <strong>de</strong> InP na diregeo (100) cam mo-<br />
ment', d° parimetro <strong>de</strong> redo Uketaiem borne ds 10^4. As mobili<strong>da</strong><strong>de</strong>m eletenicas, nedi<strong>da</strong>s pela<br />
tecnica <strong>de</strong> man <strong>de</strong>r Pane, sao ompariveis eon melhores valores <strong>da</strong> literatura pars a nesma fal<br />
ea ,concentracio dpportadores Co masa melhor rasultado ate agora fol u(77x) - 40000 cm2 4<br />
-4 para n - 32c1OLDia-3). A Us <strong>de</strong> =Thom a reprodutibili<strong>da</strong><strong>de</strong> 628 creschnentos a Molnar<br />
mail' ain<strong>da</strong> a con entrap <strong>de</strong> partadores, estamos estu<strong>da</strong>ndoo efeito <strong>de</strong> Arica parknetros<br />
<strong>de</strong> crescimento ochre a qunii<strong>da</strong><strong>de</strong> dos =totals.
DEF/10:15/4A F I CARACTERIZACAO DE NONOCRISTAIS DE slam UTILIZANDO NICROSCOPIA<br />
DE INFRAVERNELHO E TOPOGRAFIA DE RAIOS X. Victor Huo Etgens Linstituto <strong>de</strong> <strong>Fisica</strong><br />
e Quimica <strong>de</strong> Sio Carlos - USP) a Ireno Denicolo (CPO- Telebras).<br />
No momenta. o silicio i um material amplamente utilizado ne - indistria microeletriinica<br />
a nio a provivel que seta em breve substitufdo. A observacio <strong>de</strong> <strong>de</strong><br />
faitos cristalinos tome-se "Isis diffcil a Redid& em que se produzem cristais 'Lyres<br />
<strong>de</strong> macro<strong>de</strong>feitos ("free <strong>de</strong>slocetion"). No caso dos micro<strong>de</strong>fettos, spesar <strong>de</strong><br />
serem ■mplamente estu<strong>da</strong>dos nos iltimos anos. ain<strong>da</strong> nio se tem uma teoria amplamen<br />
to 'melts sobre sues origens a consequincias. As tecnicas que usamos pars a ob=<br />
servncio <strong>de</strong> micro<strong>de</strong>feitos foram a topografia <strong>de</strong> roles x e o microscopic <strong>de</strong> infraverselho.<br />
A visualitogio dos micro<strong>de</strong>feitos torna-se passive' atraves <strong>da</strong> <strong>de</strong>em, -<br />
gin do silicio cos cobra ou litio. A <strong>de</strong>coragio consists na difusio <strong>de</strong> cobre ou<br />
litio no silicio em altas temperatures; promove-se entio um ripido abaixamento <strong>de</strong><br />
temperature <strong>da</strong> amostra, fazendo coon que o cobre ou title cheguem a supersaturecio<br />
e precipitem. A precipitacio <strong>de</strong>stes metals se di preferencialmente nas rogiies<br />
<strong>de</strong> <strong>de</strong>feitos. Isto germ contraste eletranico necessario pars a observagoo dos<br />
micro<strong>de</strong>feLtos na topografia a na microscopia <strong>de</strong> infrovermelho. Sio analisados os<br />
resultados ohtidos pars amostras <strong>de</strong> silicio <strong>de</strong> varies procedincies, variando-se<br />
temperature <strong>de</strong> difusao, quanti<strong>da</strong><strong>de</strong> <strong>de</strong> material difundido e tipos <strong>de</strong> <strong>de</strong>feitos revelados.<br />
Paz-se uma comparagio entre as ticnicas <strong>de</strong> topografia <strong>de</strong> raios x e microscopia<br />
<strong>de</strong> Infravermelbo pora o caso estu<strong>da</strong>do. ( CNPq - FINEP - TELEBRAS ).<br />
DEF/10:35/4A.F<br />
ECARACT ERTZKI0 os mums EICIENSOS D3 szacro ATRAV cc DIFIUGCNEIRIA<br />
GNIA.am-calves, O.D. CIPAE147), Schr,i<strong>de</strong>r, J. UNI-Fierlini, Graaf, H.<br />
(I011-earlin).<br />
UtiLL o difratanotro do radial* gams do Institute+ Halm-Ileitner <strong>de</strong> Berlin, e ra-<br />
disci° <strong>de</strong> 0.0392 X proueniente <strong>de</strong> um, font° <strong>de</strong> Indio <strong>de</strong> intenei<strong>da</strong><strong>de</strong> <strong>de</strong> 200 Ci, anallsco-se u<br />
ma si<strong>de</strong> <strong>de</strong> menocrletais <strong>de</strong> Si 11 as <strong>de</strong> eapassura, 10 co, <strong>de</strong> dikretzo) cm divers= ewer:tee<br />
do voila*. Poi medi<strong>da</strong> a pater' 'eta <strong>de</strong> relearn integrals variando-se a Fosigio e a incline*<br />
do orbital au mimeo i diregeo <strong>da</strong> rediacio inci<strong>de</strong>nte. Foram =him obti<strong>de</strong>s "rocking curves"<br />
Pura diferentes reflesiies aceseivete, eendo poesivel urns calparegio entre digerentm pro:0es=<br />
<strong>de</strong> crescirento dos cristais Icedldos pals Nicker Chalitratite<br />
Awshrente estu<strong>de</strong>zros a poseibt.li<strong>da</strong><strong>de</strong> <strong>de</strong> ixplantagio <strong>de</strong> us state= <strong>de</strong> difrabsootria germ<br />
senelhante no Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong><br />
DEF/10:55/64.F1 VARIACAO DA FIGURA DE MERIT° (1) EM LIGAS NONOCRISTALINAS<br />
SINTERIZADAS 110Si-ZOGe - Odillo B.G. Assis, Luis V.A Scaly'<br />
e Bernhard J. Nokross - Inst. <strong>de</strong> <strong>Fisica</strong> a Quimica dt Sao Carlos<br />
-<br />
As ligas SI-Ge azio caracterize<strong>da</strong>s per sue balsa resistincia elitrlca, balsa<br />
condutividn<strong>de</strong> tirmica e alto estabili<strong>da</strong><strong>de</strong> quImic ■ e meanies. Estes carocte-<br />
✓(sticas associe<strong>da</strong>s a eleva<strong>da</strong> figura <strong>de</strong> mirito (1) pars geragio <strong>de</strong> potincia termoeletrica.<br />
fazes <strong>de</strong>ssas liana os materiais indicados i confecgio dg diapositives<br />
geradores <strong>de</strong> termaeletracids<strong>de</strong> a temperatures superiores a 1000 C.<br />
Os cristais usualmente utilizados na conferee° dos midutos sao ligas monocristelinas<br />
altamente dopa<strong>da</strong>s (Fisforo-n. Boro-p) em composigoes ZOGe-8051..Em-<br />
bora atuatmente tem-se optado par materials sinterizados (<strong>de</strong> mesma composicao)<br />
coma process° Influente its melhore <strong>de</strong> Z (relagio quo envolve as caracterfsticos<br />
termoeletricas do material).<br />
E apresentado a variacio <strong>da</strong>s proprie<strong>da</strong><strong>de</strong>s relaciona<strong>da</strong>s am Z com relagio<br />
nos monocristais a ligas sinteriza<strong>da</strong>S. (FAPESP).
DFF/11:15/ 4 A I' I CRESCIMENTO R CARACTERIZACAO DE MONOCRISTAIS DE LiNb03 E SUAS<br />
soLucOES SOL1DAS (MIDAS. Edson Salvador Octaviano e Jose Pedro Andreota ( InSti-<br />
tuto <strong>de</strong> <strong>Fisica</strong> e Quimica <strong>de</strong> Sio Carlos - USP ).<br />
A matriz monocristalina <strong>de</strong> LiNbO % e suns solucies solidus oxi<strong>de</strong>s tee <strong>de</strong>spertedo<br />
crescente interesse <strong>de</strong>vido a sue Aplicecio em diversas tecnologias come: lasers<br />
.<strong>de</strong>tectores Oticos integrados. dispositivos eletro-Oticos. comunicacees Oticas.<br />
memories dticas. etc. Deve-se consi<strong>de</strong>rar que as solucees !ai<strong>de</strong>s Oxi<strong>de</strong>s pos-<br />
suem a versatili<strong>da</strong><strong>de</strong> <strong>de</strong> otimizacao <strong>de</strong> sues proprie<strong>da</strong><strong>de</strong>s pare aplicagoes especificas<br />
strives do controle <strong>de</strong> sus composicao.<br />
0 noes* trebalho tarico-experimental tem cow? base o crescimento <strong>de</strong> monocrls-<br />
tale do LINF903 pures e dopados (Cr3* . Fe 3 ° . c outros Oxi<strong>de</strong>s). atroves do<br />
meted° <strong>de</strong> Czochrelski bem como a orientasao dos dominios <strong>de</strong> dipolos fer-<br />
roelirricos do LINbO3 durante o processo do creselmento strives <strong>de</strong> aplicacao <strong>de</strong><br />
um clump° eletrico. sendo quo essa orlentegiio <strong>de</strong> dominios <strong>de</strong> dipolos ferroelitricos<br />
necessirla <strong>de</strong>vido a sue <strong>de</strong>pen<strong>de</strong>nci ■ com ■ quali<strong>da</strong><strong>de</strong> Sties do cristal. <strong>de</strong> gran<strong>de</strong><br />
importincia quando <strong>de</strong> sua aplicocao em dispositivos.<br />
A caracterizecao <strong>de</strong> sues eroprie<strong>da</strong><strong>de</strong>s. corn infuse na perfeicao estrutural e na<br />
analise do orientac5o dos dominios <strong>de</strong> dipolos ferroelitricos felts atraves <strong>de</strong><br />
unique gamic° (UP:11NO3 - 1:2) c microscopic e tamhem RX. A analiso <strong>da</strong> concentrncap<br />
<strong>de</strong> dopantes na matrix i feita por espectrofotornetria <strong>de</strong> absorcio atomics e os<br />
resultados encontrados nos permitem obter o coeficiente <strong>de</strong> segregaca0 efetivo.<br />
fun<strong>da</strong>mentel pare o planejamento <strong>de</strong> novos experimentos. (FAPESP.FINEP).<br />
DEF/11:35/411.F1 CARACTERIZACAO DE MONOCRISTAIS E POLICRISTAIS DE LiNbO, DOPADOS<br />
COM Cr0 . Valmor Roberto Mastelaro. Irene Denicol. Y Prlmeireno Mdscarenhas<br />
e Maria 3 Cristino Tenn is (Institute <strong>de</strong> <strong>Fisica</strong> e Quimica <strong>de</strong> Sao Carlos - USP Sao<br />
Caries )("CPqD-Telebras ).<br />
Os cristais <strong>de</strong> LiNbO, puros ou dopados tem <strong>de</strong>spertado gran<strong>de</strong> interesse <strong>de</strong><br />
pesquisa <strong>de</strong>vido a sue gran<strong>de</strong> -vorie<strong>de</strong><strong>de</strong> <strong>de</strong> aplicecoes . tali coma: acastice. "titles<br />
nao linear, memories dticas e holoerlifia..<br />
Medimos por difracio <strong>de</strong> Raio-X (metodo <strong>de</strong> Debye-Scherrer.tendo siliclo come<br />
padrao interne e refinement° por minimos quadrados) a carioca° dos perametros<br />
<strong>de</strong> ca.'s unitaria hexagonal dos cristais <strong>de</strong> LiNbO, puros ou dopados cos CrO, em<br />
funcio <strong>de</strong> concentrocao do dopante.Preten<strong>de</strong>mos atteves <strong>de</strong>stes resultados prdpor<br />
quails oloossiveis sltlos ocupados pelos ions dopantes na estrutura do LiNbO<br />
(Li .Nb "e vacancies) e compare-1os com aqueles obtidos per Takei(Mat. Res. BulI.<br />
vol. 17. 1982) pare o sistema LiNb0 dopado com Fe.Os resultados por nos obtidos<br />
ate o momento indicam um comportemeflto dlferente pare o caso do Cr.<br />
Paralelamente. usando amostras monocristallnas cresci<strong>da</strong>s sob campo eletricc<br />
utilizamos a tecnica <strong>de</strong> RPE (Ressonincie paremagnetica eletrenice) a fim <strong>de</strong> <strong>de</strong>teroinar<br />
a valincia e e simetria <strong>de</strong> grupo pontuel do sitio ocupado pelo dopante.<br />
Os espectros <strong>de</strong> RPE <strong>de</strong> nossas amostras dopa<strong>da</strong>s com Cr0 apresentam bandits mais laz<br />
gas do que as °bri<strong>de</strong>s por Rexfordpournal of Chem. Phyd..VOL 52. 1970). possivelmente<br />
<strong>de</strong>vido ao fate <strong>de</strong>s mesmas nao serem monodominios ferroeletricos. ( CNPq -<br />
PAPESP - FINEP )<br />
DEF/11:55/4A.F1 CARACTERIZACAO DE MONOCRISTAIS DE EisTiO 3 .ALrton Abrahao Martin e<br />
Jose Pedro Andreete.(Departemento <strong>de</strong> <strong>Fisica</strong> e Ciencia dos <strong>Materia</strong>ls do Institute<br />
<strong>de</strong> <strong>Fisica</strong> e Quimica <strong>de</strong> Sao Carlos <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo).<br />
Os monocristais <strong>de</strong> Titanato <strong>de</strong> Birks (BaTiO ). foram crescidos polo meted° <strong>de</strong><br />
T.S.S.G. (Top See<strong>de</strong>d Solution Growth). no DEportamento <strong>de</strong> Fisic ■ e Ciencia dos<br />
<strong>Materia</strong>is.pertindo <strong>de</strong> um composicao nao estequiometrica do sisteme Ba0 - TiO 2<br />
(67% mol TiO2 e 33% mol Be0j. Em alguns monocristais ocorreram o <strong>de</strong>senvolvimento<br />
<strong>de</strong> trincas rnacroscdpicas em realises isola<strong>da</strong>s e uma alterecao <strong>de</strong> cor.<strong>de</strong>vido a incorporagao<br />
<strong>de</strong> impurezas constitui<strong>da</strong> principolmente <strong>de</strong> ions <strong>de</strong> Fe <strong>de</strong> valincia '<br />
nin<strong>de</strong> nao <strong>de</strong>termina<strong>da</strong>. Entr ttttt o os processes <strong>de</strong> carecterizegio efetuados reins'<br />
ticnicas do Oifratograma do Raios X.Fotografias do Lauc.nebye-Scherr.Auilise qufmica<br />
por Espectrescopia <strong>de</strong> Absorgio Atiimic ■ e Espectrescopia Otica.mostram que os<br />
monocristais <strong>de</strong> BaTiO 3 obtidos estio compativeis com os encontrados na literature.<br />
Algumas medi<strong>da</strong>s iniciais <strong>da</strong> temperature <strong>de</strong> transicao <strong>de</strong> fase (ferroeleirica- Paraeietrica)<br />
mostram que aparentemente a temperature <strong>de</strong> Curie nao e altera<strong>da</strong> por<br />
estas impurezas. permanecendo em aproxima<strong>da</strong>mente 130gC.
OEF/8:00/5A.F ICARACTEBIZACAD DS UN CRISTAL LASER DETBLF (* . Narly Buena <strong>de</strong> Casargo ") ,Nelson<br />
Batista <strong>de</strong> Lima, Lsircio Comes a Spero Nobs Rorer° (In ss i tt to<strong>de</strong>Pesquisas Baer<br />
whites a Nuelesres - CNEN/SP) Howard Joseph Guggenheim (Bell Telephone Laboratories).<br />
0 ablative <strong>de</strong>als trabalh e ■ coustrucio <strong>de</strong> as laser pulsado <strong>de</strong> YELP (LiTemiErzA on<strong>de</strong> a Er<br />
estando moms come ttttt io <strong>de</strong> 402 nio a macs 0 dopante ds ru<strong>de</strong>, mss faeparte <strong>de</strong>l.Obtemos coma isle<br />
um ' 1 aisle que e a principal novi<strong>da</strong><strong>de</strong> <strong>de</strong>ers projeto, uma vet quo ate o presents nio se utili<br />
sou eon ttttt 'cies <strong>de</strong> Er sup ' 102. A emiesio estimeta<strong>da</strong> atlas <strong>de</strong> 1 ■41es i<strong>de</strong>interesse, pail;<br />
olho humane esti meson sujeito a <strong>da</strong>nce na retina, as vas que ■ transmissivi<strong>da</strong><strong>de</strong> do mein ocular<br />
fits suite redusids. For este motive eseolhemos a transigio em 1,73umpera Cate estudoetombim per<br />
gee into favored' aplieftiee foruras es gismos <strong>de</strong> medicio <strong>de</strong> distineies. Forum faitasmedi<strong>da</strong>. <strong>de</strong><br />
flue La <strong>de</strong> rules-x. °bread° -se a fOrmula minima pars o material: LiTsAiersA Fe. 0 einem <strong>de</strong><br />
item, <strong>de</strong> Er fol. estimado as 4,62. 10"itomos/cm'. A <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong>nte ' 1 e <strong>de</strong> 4,696 g/cm'.`As<br />
medi<strong>da</strong>s dos perinatales <strong>de</strong> ri<strong>de</strong> foray [mites numa cimare d spd do tipo Guinier, cam padrio interne<br />
SiO. Obtivemos a.b. ,(5.161 t 0.010) A.c. (10,720 t 0,027) ► e o volume <strong>de</strong> eiluls unitaria a Tc.<br />
- (2854,1 t 1,139)A', Segundo a lit , sates valorem pars cristal puns <strong>de</strong> YLF a - b<br />
T 5,168 A. e. 19,736 A, V. 286,739 A' e pars ums dopagem <strong>de</strong> ate 8Z am Er sio a.b. 5.175 ,e.10.74<br />
A. Tc. 287,624 A'. lute sugere que a safer coneentracio <strong>de</strong> Er condor a ums cootracio dm cilula out<br />
tint. resultando stoma estrutura maim compacts:<strong>de</strong>. Hedi<strong>da</strong>s <strong>de</strong> Agora, optics mostrarsalqueoespeetro<br />
cautious a apr fishes floss, tome 6 tttttt eristico don elementos <strong>de</strong> confLgurocio 41 11 <strong>de</strong>vi<strong>da</strong>s<br />
a use interatio elicroo-fonon grata. Redi<strong>da</strong>s prelimiares <strong>de</strong> emissio obtids per use ezeitatio rem<br />
um laser <strong>de</strong> ■rginio es multilinbas resultaram name emissio integrads mama <strong>de</strong> 800 um, do or<strong>de</strong>e<strong>de</strong> 8<br />
vszes senor que a emissio do neodimio a Li us matrix <strong>de</strong> TLF.<br />
(+) Desenvolvido tom apoio <strong>de</strong> FINE!.<br />
(") Bolvista <strong>de</strong> pis -doutormsento, FAFESF.<br />
DEf/8:20/54.F ICARACTERIZAVAO DO QUARTZ::: NATURAL E SINTLTICO. Carlos K Suzuki,<br />
grletimpao R.L. Feriae a Daniele C. A. Hummel. UNICANP - Institute <strong>de</strong> <strong>Fisica</strong>.<br />
O quartzo natural apresenta usa complexa e imminente game <strong>de</strong> <strong>de</strong>feitos <strong>de</strong> cresolmento,<br />
tale come, geminados. <strong>de</strong>slocagoes, "boun<strong>da</strong>ries", inelusaes sOli<strong>de</strong>s e liqui<strong>de</strong>s<br />
(samosas), heterogenei<strong>da</strong><strong>de</strong> na ooncentragao <strong>de</strong> impurezes, etc. qua <strong>de</strong>pan<strong>de</strong>m <strong>da</strong><br />
geologic: <strong>de</strong> foraecio a <strong>de</strong>s condigaes <strong>de</strong> crescimento na naturena. Por exeeplo, a<br />
diatribuicao <strong>de</strong> microcevi<strong>da</strong><strong>de</strong>s ("bubles") ocorre preferenoialmente so longo dos<br />
"boun<strong>da</strong>ries" e "cracks", e a sua Concentragio emti relaciona<strong>da</strong> nom Outroa tipos <strong>de</strong><br />
<strong>de</strong>feltos estruturais.<br />
Por outro lado, o quartzo sintetico crescido em autoclaves polo process° hidrotermico<br />
<strong>de</strong>pends basicamente <strong>de</strong> tram fatoree: (1) a quali<strong>da</strong><strong>de</strong> <strong>de</strong> sements; (2) a quell<strong>da</strong>d,<br />
do nutriente (lances); e (3) as condlgOes <strong>de</strong> crescimento.<br />
O eatudo <strong>de</strong> earacterizagio realized° per topografia <strong>de</strong> raios-X <strong>de</strong> dupla reflezio<br />
em cristals naturais a sintitleos, levando em consi<strong>de</strong>ragio o conhecimento privio<br />
<strong>da</strong> jazi<strong>de</strong> (quartzo natural) e o controle <strong>de</strong>s tree condigGes baeleaS <strong>de</strong> erescimento<br />
hidrotermico, foram cOrnslaciona<strong>da</strong>e cos observacaes per microsCopla Otica. Estes<br />
resultadoe revelem infOrmagoes bielcae cobra o mecanismo <strong>de</strong> crescimento natural e<br />
sintitico. (FAPESP, J1CA, ABC-XTAL).<br />
OFF/8:40/SA.4 DINANICA DA 1111111tFACE DS CRISTAIS EN cascileirro Emma roi M6I0 DE TecmicAs<br />
D8 ESPAIMARENTO DE LUZ - 0.N. Mesquite, L.O. Imeleir ■ twain Gootijo - Deprtamento <strong>de</strong> <strong>Fisica</strong> -<br />
ICE: - UFNG - Belo Horizonte - MG<br />
Espalhameoto quasi -elistieo <strong>de</strong> luz a feito nas interfaces cristal -liquid° eristal -vapor <strong>de</strong><br />
eristai ■ durance ereselmeuto.num arranjo tipo eridgmen. toformsgies i nivel <strong>de</strong>s flutuacies qua<br />
semi 'picas nes interfaces sae obti<strong>da</strong> ■ e mo<strong>de</strong>los 'Caicos sera: dimeutidos pars explicaros<br />
resultados esperimentais.
DEF/9:00/;;71—<br />
TRANSKAO DE FASF. EM FILMES DE KIT,<br />
T.Del Sol<strong>da</strong>to. R.A.Munes ■ L.C.Scavar<strong>da</strong> do Carmo - Depto. <strong>de</strong> <strong>Fisica</strong> DOMM.PUC/<br />
RJ.<br />
Films ■ linos <strong>de</strong> KIMP, Foram e aaaa idos par evaporagio a .vicuo co!Lespessura <strong>de</strong><br />
aproxima<strong>da</strong>meote 0 :3mm, pobre pubs <strong>de</strong> Xbr. 0 process° <strong>de</strong> evaparageo <strong>de</strong>co:woe o cristal pe-<br />
'undo a reagao quzmica KPFs RF Pli s , dificultando a forme/610 do filmes mais espessos.<br />
A absorgAo Sties <strong>de</strong>stes filmes no espeetro infravermelbo 'presents blon<strong>de</strong>s mas<br />
macs <strong>de</strong> 900 a 730 emi' e <strong>de</strong> 3110 550 cm", d dos mo<strong>de</strong>s vibracionai ■ <strong>de</strong> stiramento<br />
<strong>de</strong> flea° infravermelho ativos do on molecular (PF e )- . A seines <strong>da</strong>shes ban<strong>da</strong>s <strong>de</strong> ■bsorgip<br />
a virias temperatures entre 77R temper rrrrr ambient* permits observer a transigie entre as<br />
dues law e rrrrrr relmente di ' Credos fee ee) do cristal Is KM.<br />
A energia <strong>de</strong> bands <strong>de</strong> absorciio emir distant* (OM eV) S um valor eompacivol<br />
cam rsultados <strong>de</strong> medi<strong>da</strong> ■ <strong>de</strong> dteegas <strong>de</strong> lmmineseeneis <strong>de</strong> RPF 1 ezeitsdo per rain-X.<br />
DEF/9120/5A.,<br />
FILMES DE MATERIAIS tONICO-MOLECULARRS<br />
Raul Almei<strong>da</strong> Nunes, Luiz Carlos Cue<strong>de</strong>s Valente. Sidnei Peciornik,<br />
Tarsea <strong>de</strong>l Sol<strong>da</strong>to, Joao Carlos Cenci*, Luis Carlos S <strong>da</strong> do<br />
Carmo<br />
Depto. <strong>de</strong> <strong>Fisica</strong> DCMM. PUC/RJ<br />
Cristais <strong>de</strong> m is iinico-oo1etul.ree pods ■ er produsido ■ fseilmente por eve<br />
porasao a views. Haloesnetos aleslinoe, um eliminate alcalino(KCN) EFF6(Iluoreto<br />
<strong>de</strong> fosforo pogissio) foram crescidos ems asp false <strong>de</strong> 0,311 a 1.2u em<br />
forma toot° criatalina quaato snort..<br />
Estes materiais produsidos esclo ■end° caract rr i rr dos per diverse. tieniess: di-<br />
frogio <strong>de</strong> rains I. absorgao Stied no inf lho, indic <strong>de</strong> refragio, carecte-<br />
riatiess <strong>de</strong> <strong>de</strong> cor produsidos.<br />
Preten<strong>de</strong>-se produsir diversion materiais, ' -moleculares no forms <strong>de</strong> filmes<br />
lino ■ compares' sues propri<strong>da</strong><strong>de</strong>s con as dos eristsis erscidos per mitedos usual,.<br />
-vmmmmmmmmemiemm<br />
DEF/9:40/5A.F IDEPERDEMCIA DOS PARAMETROS OR SWISS NA CRISTALINIDADE E HAS PRO<br />
PRIRDADES DE MATERIAIS BIDIMEMSIONAIS POL/CRISTALKNOS DERIVADOS DE ACIDOS FOSFO —<br />
RADOS E Zr(IV). Osvaldo Luiz Alves,P M.S. Carrido(CEgY, Institute <strong>de</strong> Qur<br />
miea,UNICAMP) e Lisandro P. Cardoso (institute <strong>de</strong> <strong>Fisica</strong>, UNICANP).<br />
As reacAs entre as icicles 11PO L a liro,, respeeti to, ortofoefOrieo a<br />
food rrrrr Co. Zr(IV).em eolugio dquEsa, for<strong>da</strong>m um gel bronco suite <strong>de</strong>nse. Cote<br />
gel foi tratado in diferente ■ condigies no sentido <strong>de</strong> se 'campaniles. a evolugio d ■<br />
cristalini<strong>de</strong><strong>de</strong> eom relagio cos swains. p. - : tempo <strong>de</strong> trtamento hidrotermieo,<br />
tempo do egitegao * or<strong>de</strong>m <strong>de</strong> edits° doe reagentss. A <strong>de</strong>pendincia doe pa<br />
rim rrrrr foi rr :sha<strong>de</strong> utilizando as ticmiea ■ <strong>de</strong> reios-I(mitodo do pa) e tepee<br />
troscopia <strong>de</strong> absorgio no in! meth*.<br />
Os <strong>da</strong>is sistemas go rrrrrrr um ■ forte <strong>de</strong>pend - ' do rrrrr to <strong>de</strong> cristalini<strong>da</strong><strong>de</strong><br />
eom a tragio do :cid° e do tempo do tretemento. No caso do !Emilia Zr(EPO,),<br />
oil 0 /Dodos mor obtido ■ meteriai ■ con bus cristallni<strong>da</strong><strong>de</strong> mesmo ■ e ■ a utilizacan 'dB<br />
triitamentos hidrotirmicos.<br />
Paradocalmente, pare rectos sistemas <strong>de</strong>ri<strong>de</strong>s:: emi sense amorfos(tic-<br />
nice <strong>de</strong> raios-X). at - <strong>da</strong> tecnico <strong>de</strong> 'spec rrrrrr pis no infravermelho pods sir<br />
obeervad ■ ums or<strong>de</strong>r a di - .sugerindo qua a formacio <strong>de</strong> lamely ?oil:seri<br />
ra (Zr0 6 ) ocorro mosso no mot 1 quasi-gel. 0 comportamento termico e are ■ su-<br />
perficial (metodo B.E.T) ap rrr m grand. variagio in fungi° doe parimetros <strong>de</strong><br />
sinters utilitadoe.<br />
Estes material. Eo<strong>de</strong>m mer usados come preen rrrrrr no r i r le. rrr <strong>de</strong> vAria ■ fami-<br />
lies <strong>de</strong> cond., rrrrr solidos ionico ■ protonicos. alcalino ■ msetos(0114.FIDEP).
DEF/10:15156.FIDIFUSIO OE Fe NO ALUMINATO DE 116010 O b . J.M.Usto, H.S.Amorim,K. B.<br />
Amaral Jr., T.Abritta a F. <strong>de</strong> 6.Barros<br />
loos <strong>de</strong> Fs trivalent. pods= ocupar <strong>da</strong>is tipos <strong>de</strong> ortias no superLinieo<br />
Aluminato <strong>de</strong> ()Odic 0" 1 'pities Beaver-Ross (BI), Ise raga° <strong>de</strong>_canducie iinica a<br />
atlas A1(3), ip ■ blue°. spinets. preximo ■ i reale° <strong>de</strong> conduce°. A populace° rale<br />
tiva <strong>de</strong> °cerise° <strong>da</strong>nces @icicle (oati° I II, respactivaments) <strong>de</strong>pend <strong>de</strong> tempo<br />
<strong>de</strong> ling do materiel, e quando rite tempo i seism <strong>de</strong> 10h Ca 12009C) pod mu<br />
<strong>de</strong>r ■ tamp a qua a temp bleats. 2 praposta um. infuse° .<strong>de</strong><br />
lone Fe <strong>de</strong> ■ Itios i pars shies II a temperatures manse. qua a tamp vvvvv re mbi.<br />
once nom materials submatidoe a Longo Ling.<br />
O ■ materials, cow ate 1Z at./mol <strong>de</strong> Fe, see investian<strong>de</strong> ■ at vvv i v <strong>de</strong> le<br />
mineseincEs <strong>de</strong>nte ion.<br />
OEF/10:35f5A.FI<br />
OfF/10:56/511.F<br />
PESDAS DIELOTSICAS DE IONS 011 - NOS IIALETOS ALCALINOS, LaircLo<br />
Comes, Instituto <strong>de</strong> Pesquiaas Energiticas a Nucleares - 'PEN-<br />
CNEN/SP<br />
A presence <strong>de</strong> ions 011 - substitucionals am matrixes sdli<strong>da</strong>s <strong>de</strong><br />
"CZ, KBa a RiAlk am concentraccIes entre 10 a 10 s partes par mol, introduz picos<br />
<strong>de</strong> par<strong>da</strong>s dielOtricas (medi<strong>da</strong> per ticnica AC) localizados no Intervale <strong>de</strong><br />
frequOnciaa entre 10 a 10 111z no regLio <strong>de</strong> altos temperatures entre SOK a 100K.<br />
Esse por<strong>de</strong> é stribui<strong>da</strong> a um possivel mecanismo <strong>de</strong> reorientacio allspice ( tipo<br />
Arrhenius ) <strong>de</strong> dipolos cos energies <strong>de</strong> ativacio E%927cm -1 no EU, Em.1201cm -a em<br />
ABa a E%1009cm -1 no RbBa. Essex valorem <strong>de</strong> E est& compativeis cam os valores<br />
<strong>da</strong>m barreiras rotacionais (K) estima<strong>da</strong>s pare a reorientacio dipolar OH- nes varies<br />
ro<strong>de</strong>o estu<strong>da</strong><strong>da</strong>s 111%640cm" em KC21.<br />
A <strong>de</strong>pendincia linear <strong>da</strong> constants dielitrica imaginiria Ante -<br />
gra<strong>de</strong>, A(f"). cam a concentracio <strong>de</strong> CH- a Umbers com T -1 sugere que o efeito<br />
observado seja produzido pox dipolos elfitricos isolados porem com magnitu<strong>de</strong> p<br />
redusi<strong>da</strong> mo<strong>de</strong> p ■ 0,4 pm,-<br />
TERMOLUNIKESCENCIA INDUZIDA EN vonas ALUNINAIOS DE CALCIO. Roberto Fortini<br />
(MAUL In<strong>de</strong>stris e Comircio Ltd..) e Ana Re Lna Blsk (DepertrnW ent<strong>de</strong>ea<br />
Nuclear do Institut° <strong>de</strong> rhilea <strong>de</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Elio Paulo<br />
Pare o estudo <strong>de</strong> tersolumineseenela (TL) induzi<strong>da</strong> em vidroo aluminatos <strong>de</strong> cileio for uti<br />
liza<strong>de</strong>s nmostras coo a composicio <strong>de</strong> 40.6 A1,0,, 49.0 C.O. 6.1 SiC ■ 4.1 RIO.<br />
A curve <strong>de</strong> masa° IL <strong>de</strong>s amostres epresente um oleo cop minima em temperature em torso <strong>de</strong><br />
150°C. 0 <strong>de</strong>vilment° tersico <strong>de</strong>nte pie° fai astudndo porn tempersturas entre 300 e 12000. Ume<br />
aniline <strong>da</strong> nineties <strong>de</strong>mo process° termite revelou qua nrio se trstava <strong>de</strong> primelra au <strong>de</strong> eesp<strong>da</strong><br />
°Hee. Poi utilized° !WAR o meted° do ftubi<strong>de</strong> que permits obteneio dos parame-<br />
tros: eneraie <strong>de</strong> tivagio later <strong>de</strong> freqUenels ■ pertir do orifice do loasritmo <strong>da</strong> e<br />
ea fungi° do inverse <strong>de</strong> temperature. 00 spliencio <strong>de</strong>nte setae° eonetatou -se que a bends reeul<br />
to <strong>de</strong> um. superposicio do miring piton eve umn distribuicio quane continua <strong>de</strong> nivele <strong>de</strong> enema;<br />
<strong>de</strong>s areedilhae. 0 estudo fel eumpletado nom a ut111eacao <strong>de</strong> um terceira metado que relacions<br />
a posicio em teeperstura do pica <strong>de</strong> emisaeo EL com o miner° Inielal do portadores <strong>de</strong> cargo arms<br />
dilhados. (MEP)
OEF/11:15/V1.1 CRISCiglaro E CARACTERTKACIO DE CRISTAIS OE III PARA DETETORES DE RADIACIO.<br />
Sonia Licia Balduchl e Spero Penha Murata (Institute <strong>de</strong> Pesquism Energetics,<br />
eauces tICIIENISP).<br />
Criamis <strong>de</strong> io<strong>de</strong>to <strong>de</strong> Odic' dopsdos con tilio sin rotInelramonte crescido no SiganS aA/SCS<br />
comercialise<strong>da</strong>s ji forma <strong>de</strong> ciatilodotes (escapsulados) pars <strong>de</strong>teicio <strong>de</strong> cadiscin. 0 objetivo<br />
Mate trabalho i o dosenvolvimmo <strong>de</strong> um projeto par. implantagio <strong>de</strong> um mitodo apropriado i obten<br />
cis, <strong>de</strong> cristsi ■ do 11.I:Te par. posterior construcio do <strong>de</strong>taeores <strong>de</strong> radiacio. 0 Weiner a<br />
monscristsi ■ <strong>de</strong> Natal (cm comentrecies apropriadss) ■presenta dificul<strong>da</strong><strong>de</strong>s <strong>de</strong>vidoa alto pros<br />
sio do vapor do eilio no fusio. Os rosultsdos obtidos, ati o presence, <strong>de</strong>mon quo o puzamen<br />
to Csochrolski, muito utilized° no crescimento <strong>de</strong> ballot°. em Reral. results m baixas<br />
comentracies <strong>de</strong> tilio incorpora<strong>da</strong> i reds. <strong>de</strong>vido a caractertstices priori's do meted° (cadinhoo<br />
oio selados). 0 mikado fieldsman, °soft pesquissdo ate/domes, apresenta dificuldo<strong>de</strong>s relativas<br />
quali<strong>da</strong>ds ities do c 1 obtido, intestine° apresenta-so abi<strong>de</strong> coon ms solucio viivsl.<br />
DEF=5R.F ESIIMMA DE MMUS DE SILICA, D. doe Santos e M. Aesprter. Institoto <strong>de</strong> Fini<br />
Ca <strong>de</strong> SiO Carlos, A. F. Cralevich, Centro IlessIlelro <strong>de</strong> Pesqulgas Fislcas. Rio <strong>de</strong> Janeiro<br />
T. Laura e J. Zarsyckl, Unlverslti <strong>de</strong> Montpellier.<br />
Aerogels forme ppx■Exidos por stead:, hlpercritico <strong>de</strong> gems amldos obtidos a pertir <strong>de</strong> eolucam <strong>de</strong><br />
16064goa.netenol. Aa estroommus antes materials form eatu<strong>da</strong><strong>da</strong>s par espahrinento <strong>de</strong> role X a<br />
balms imam utilizondo :sea fonts aincrotrm (LURE). Em aerogels bislas a neutrom foi &marl/ado<br />
quo a ellammil, fractal e o ralo <strong>de</strong> giro 'parent, Glisismion perm concentric/Jo <strong>de</strong> 7N38 creacente. Fb<br />
ram observados "cross-mere" nes cuma <strong>de</strong> espalhanento cue Indiana a presence <strong>de</strong> uni<strong>da</strong>dm estrutu<br />
rain <strong>de</strong> 13.5 A (gels bialcos). 6.5 A (gels neutron) .43 A (Beim icid08). Oa valorem crescentes <strong>da</strong><br />
area <strong>de</strong> interface. eedi<strong>da</strong>s per BET: 4011,/g (bisioos),700d/g (neutron) e 850 /g (acidos), sin<br />
coerentes corn as analogies expmstas scans.<br />
DEF/I1:55/5R.F COMPOITAMERTO TERMICO DO PERIM DO Bi IMPIARTADO EM SUMMAR BI-CANADA. C.A. 0-<br />
livieri (DP/UTSCar), P.V.P. Ficlitner (IP -NIGE), J.P. Biorseck (B.M.I.-Berlin) a D. Flak (igrie7-<br />
Malls/mom isplantacies <strong>de</strong> Lona <strong>de</strong> Bi am sistemas bi -closed' constituidos por filmes <strong>de</strong> Al cm<br />
1550, 610 a 1000 X <strong>de</strong> cope , maporados sabre aubstratos <strong>de</strong> Ti, EC1 V respectivamente, ten<br />
do am yin. doffs obietivos mama imedi ■tos: (1) Conparar as distribulcaes espaciais dos ions implaS<br />
tados con as p s tedricas do programs <strong>de</strong> simulacio Monte-Carlo (TRIM-Transport of Ions in<br />
Natter). d Pri<strong>de</strong> por Bi k e Hammock. (2) Onetime o comportment° dos ions Implantados.<br />
spas tratsmatos Lin<strong>de</strong>n' isacronos. A vicnice utIliza<strong>da</strong> pare amlisar as distribuicims foi a <strong>de</strong><br />
Espectroscopis <strong>de</strong> sa palbamento <strong>de</strong> Rutherford (IBS). Os resultados fornecidos polo TRIM pars<br />
oa sistemos estu<strong>da</strong>dos esti° tot/Hoene. <strong>de</strong> acordo cm on dodos obtidos experimmealments. repcodu -<br />
'ludo mit° ban as <strong>de</strong>scontinui<strong>da</strong>d ■ qua aparecam nos interfaces filme-substrato. Dos tratamentos<br />
tan<strong>de</strong>m pu<strong>de</strong>mos conchae qua: (1) Aa interfaces films-substrata atuarm comp b ' pare am di<br />
Naas dos ions implantsdos. (ii) Na masers <strong>de</strong> ICI, 'pia ca<strong>da</strong> tratamanto arnica a retie <strong>de</strong><br />
MO C. observance <strong>de</strong>slocamentos do perfil do 111 em direcio a soparfici. os quaff ■ no° foram chair<br />
vados no sistems Al/ICI. (iii) Ocorreu a precipitacio ds fame Al Ti 'pia o tenement° a SOO °C no<br />
AI/ri..liv) 0 coeficiearo fe Mario do Lou implantado 4 glitter Al/V ro<strong>de</strong> ser escrlto<br />
come0 ■ 5:10-2 ezp( -2.2 eV/ET) cmg/ass.
DEF/PAINEL nsTuno POR RESSONANCIA PARAMACNETICA ELETRONICA 1)0 BERILO iNCOLOR<br />
Ma Regina Blak (Department° <strong>de</strong> <strong>Fisica</strong> Nuclear, Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong><br />
<strong>de</strong> Sio Paulo), Walter Matson Pontuschka a Sa<strong>da</strong>o Isotani (Departamento <strong>de</strong> Fi-<br />
sica Experimental. Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sip Paulo).<br />
0 espectro do Ressonincia Paramagnitica Eletranica (RPE) do berilo natu<br />
ral incolor. irradiado con luz ultrovloleta.apresenta o dupleto qua caractoriza<br />
■ presence do hidroginio atomic° H° em H 1 =(0.2947!0.0003)T e em H 2 ( 0.3450 !<br />
0.0003)T medido na freqU6ncia <strong>de</strong> 9.0316x1090z. Os valores 8=2.0054:0.0003 45<br />
Aq0.930!0.002)x10 -17erg foram calculados cos o use <strong>da</strong> armula <strong>de</strong> Rreit-Rabi cos<br />
o inclusio do torso <strong>de</strong> Zeeman nuclear. Os centres <strong>de</strong> hidroginio. estIVeis a tem-<br />
perature ambionte, nio sio observados quando o berilo 8 completamente <strong>de</strong>sldratado:<br />
Assume-se quo ewes centres sio produzidos a partir <strong>da</strong> fotodissociagio <strong>da</strong> 8-<br />
gua qua existe nos canais estruturais do berilo. Foi estu<strong>da</strong><strong>da</strong> a cinitica do <strong>de</strong>-<br />
caimento isotermico do H° em 60° . 80° . 100° . 120° . 140° . 160 ° e 180°C respective-<br />
manta. %Sao observados. nitl<strong>de</strong>ments, <strong>da</strong>is processes distintos <strong>de</strong> <strong>de</strong>caimento;<br />
primeiro 8 ripido, seguldo <strong>de</strong> um segundo boat lento. <strong>de</strong> cinitica tampion.<br />
DEF/PAINEL J IFEITO OAS liADIA06ES ULTHAVIOLETA 8 GANA NA TREINOLUNINMS0eNCIA DO BERILO NATU-<br />
RAL NAs CORES ROSA IS INCOLOR (MORGANITA R 00SHENITA). Nonilton Neneses (Doper<br />
tomento <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Sergipe) e Ana Se Blank epometto<strong>de</strong>Vislea (Da7-1i<br />
Nuclear do Institute <strong>de</strong> <strong>Fisica</strong> do universi<strong>da</strong><strong>de</strong> <strong>de</strong> Rio Paulo )<br />
No estudo <strong>da</strong> termoluminescinele (TL) do beetle natural nos cores roma e incolor foram utili -<br />
so<strong>da</strong>s emostres prevenientes <strong>de</strong> Ulnas Geniis e gentilsante eadi<strong>de</strong>s par Halba Cos. e Ind. <strong>de</strong> Padres<br />
Precioses S.A.. Ratio emostras sao ricer an elementoe alcalloos e em mown= e apresentes poucm<br />
quanti<strong>da</strong><strong>de</strong> <strong>de</strong> [erre. As .linhas cereeteristicse do Nn2 e do Fe 3 see observa<strong>da</strong>m nos °spec-<br />
tres <strong>de</strong> Nessonancle Paramagnetlee illetreinlea (8PR) do berilo. A irrodiegio en lux ultraviolet's<br />
(UV) fol feita cam limpo<strong>de</strong> <strong>de</strong> Ha <strong>de</strong> 400W.. A irredincio gime fol efatua<strong>da</strong> na fonts <strong>de</strong> "70a do<br />
Institute <strong>de</strong> Biologic <strong>de</strong> OOP. No berilo irradiado can T a curve <strong>de</strong> emIseio TL upresenta dois pl<br />
cos es 1700 e 300°C. respectivamonte. Wan<strong>da</strong> ■ lux UV inci<strong>de</strong> nese= =estrus. manes an oleo e<br />
observed* em torn? <strong>de</strong> 13000. FoL feito us estudo do creaclmento <strong>de</strong>ssem pleas ton m redieeio.<br />
Verifieou-se bashes e <strong>de</strong>pan<strong>de</strong>ncle <strong>de</strong> posies° dos plow em temperature ma a taxa <strong>de</strong>.aquecimento.<br />
Para restituir as proprie<strong>da</strong><strong>de</strong>s orielesis doe mernitres forum efetuados tratamentos termites a<br />
40000 per intervalos <strong>de</strong> tempo quo varleno <strong>de</strong> 10 minutes a 1 hors. Finalmente. Col inveetigado<br />
o <strong>de</strong>vilment° tersico dos picas TL pars temperatures antes 50°C e 120 00. (FINED e CAPES)<br />
J/EF/PAINEL I 161=0 DO CNVELMCCIIIERTO C DA DESSUICAGEO DE AEROGR1S DE SILICA PDS TEO-MCA<br />
SAMS K BET. o.i. dos Milos. M.A. Aeeertee. A.F. Craievich". I. Lours e J. Zacsvelii."'<br />
In ss i tt to <strong>de</strong> <strong>Fisica</strong> a pumice <strong>de</strong> Rio Carlos - Oeiversi<strong>de</strong><strong>de</strong> <strong>de</strong> Sao Paulo. CS. Postal 369. 13560<br />
Sic Carlos. SP; ** Centro Brasileiro <strong>de</strong> Pesquimes ■imiess. Rio <strong>de</strong> Janeiro a Laboratorio National<br />
<strong>de</strong> Lux Sincrotron. Campinaa. SP; ** Laboratory of Science of Vitreous <strong>Materia</strong>ls. L.A. 1119<br />
Uni ssss izy or Montpellier. 36060 Montpellier. Franca.<br />
Aerogeis <strong>de</strong> silica forsm prepsndos per seeagem hips ' ' ■ panic <strong>de</strong><br />
Aidrelime <strong>de</strong> solucie basica acid, <strong>de</strong> MOS dissolvido em mstanol e forms esto<strong>da</strong>dos per tecni-<br />
cam BARS a Wet. Demote o eavelbeeimento dos gels o tamenbe dos pore' diminui e ■ dimensionall -<br />
<strong>da</strong>ds fractal <strong>de</strong> menu eoefirmendo ' ' ' <strong>de</strong> migracie Basica local oeorri<strong>da</strong> ne<br />
floe liqui<strong>da</strong>. Durance os tratamentos tirmieos (CU Bl0°C) o tamanbo dos pores diminui prog<br />
vemenre e i ecompanhado per cm eliammento do interface pore-matrix. A maim mita temps (ate<br />
1065°) mimeo) <strong>de</strong> pones diminui, mas os sons unsubtle somentem, condusindo ao memento progressive<br />
<strong>de</strong> <strong>de</strong>nsi<strong>da</strong><strong>de</strong> do aerosol per um mecallimmo do Ontrald. Peoquisa subveneione<strong>de</strong> palm FINE! ■<br />
CMPq a PAPERP.
DEF/PAINEL I ISIDRO DA V1SCOSIDADE DURANT" A TamarougAo soL-GEL um shack. °same Ki-<br />
nouehi Eilho e_itiehel Andre AOROtter. illiLitla0 do <strong>Fisica</strong> o Quimiea <strong>de</strong> Sic Carlos - Universi<strong>da</strong>-<br />
<strong>de</strong> do Sao Paulo. Cs. Poatal 369 ■ 13560 Sao Carlos, SP.<br />
A visemi<strong>de</strong><strong>de</strong> <strong>de</strong> sot do allies, prepared° a partir do solueicr<strong>de</strong> 1710S/Metenol/<br />
ague. lei <strong>de</strong>eermina<strong>de</strong> <strong>de</strong>tente a tronsformeglo sol -set em Iuagio <strong>da</strong> temper aaaaa a do tempo usasdo<br />
um vimosimetro <strong>de</strong> rotacio. A viseosi<strong>da</strong>d ■ progressivemente cm tempo aliments drasti-<br />
camente parte do pouto do selifieaelo. 0 sot se op 0000000 inieialments ems um liquids nevteaia-<br />
Do; ele so transforms prose - masts num liquid@ visemlistieo mire 'Inatome@ toruer-se um<br />
solid° %impel:Mice (sOlid@ do Bingham). Desersvermos o shodo usado, assim cam se proprie<strong>da</strong><strong>de</strong>s<br />
fisie ■ particulars resultautes do process° <strong>de</strong> 141=1110TESOCI 801-pl. ',sequin& suliveneions -<br />
<strong>de</strong> polo CDPq. WES', o FIRE!.<br />
1"/ /2=4EL IMPOSTS DIEUTRICA DE ARROCLIS DE SILICA. Sao Antonio <strong>da</strong> Silva a Michel An-<br />
dre Ammer. Institut° do Nana e Oluimies <strong>de</strong> Sio Carlos - Universi<strong>da</strong><strong>de</strong> do Sao Paulo, Co. Postal<br />
369. 13560 lao Carlo.. SF.<br />
Aeropi ■ do sines foram prepared°. pew omegas hipsreritiva <strong>de</strong> gels a partir<br />
<strong>da</strong> hidraise <strong>de</strong> solecism INDS - Matenot. A response dielitries dosses materials anemones porosor<br />
Vol mtu<strong>de</strong><strong>de</strong> entre 1.7 o 300 1 a from:nen. 10 -3 a 103 Ns. Pars T ° 100 R Collieries<br />
c' a to ma. motto manor quo equals <strong>de</strong> silica viers'. Uma dieinunis rapids <strong>de</strong> tee obeerved ■<br />
em torso <strong>de</strong> 3S K. mompanha<strong>da</strong> <strong>de</strong> on srands pico <strong>de</strong> por<strong>de</strong> dial' 'ca (tea) indieando a presence <strong>de</strong><br />
pan<strong>da</strong> unai<strong>de</strong>d@ <strong>de</strong> <strong>de</strong>fence. Apresenterems tuber es resultados obtidos pars airmen naia<strong>de</strong>s<br />
ten<strong>de</strong>d:mute a IOSPC du promise <strong>de</strong> <strong>de</strong>nsifieegio ( forma° word - silica vitro.) .<br />
Pommies ■ubvemeima<strong>da</strong> pole 'VAMP. CIPq a FIRED.<br />
DEF/PAINEL<br />
paopugio DE FILMES DR CIANETO DE POTLSSIO. AMORFOS S CRISTALINOS<br />
L.C. Geo<strong>de</strong>s Vslest*, S. Paeionik, R.A. Fumes a L.C. do do<br />
Corm e<br />
DI-Fra. do FIsie ■ e Dopto. do Ciancia dos <strong>Materia</strong>ls a Mateturgie.<br />
Pontillei ■ Universi<strong>da</strong><strong>de</strong> Meanie& do Rio <strong>de</strong> Janeiro<br />
Films ■ <strong>de</strong> RCN eon ■proxima<strong>de</strong>mente lum do sap foram ereseidos polo taenies<br />
<strong>de</strong> emporecio on alto r I 000 (10-Georr). sabre ■ ubstoatos mmorfos (CaF2 a S102)<br />
eristallnos (Ellr s US) a temperature ambient' a SOU. Os filmes resul<br />
foram analisados pets ticsim <strong>de</strong> difraglo do rains-i visaed° d leer a nature<br />
us ■uerte ou eristelina. Para ob rrrrrr a ■ ist:nets a, em ease efirmativo. <strong>de</strong>ter<br />
miner a temperature dm transicass <strong>de</strong> Ease (ant 1 o setiferroslitriea) coshields,<br />
no eclat.' <strong>de</strong> RCN. foram felt's medi<strong>da</strong>s <strong>de</strong> ■beercio atic ■ na regiio do<br />
int melho eom as quote se <strong>da</strong>termLeave ■ larger <strong>de</strong> Liebe do mo<strong>de</strong> <strong>de</strong> satire-<br />
■ ete do CN (sate to ..newel is transiqices <strong>de</strong> lass). Vol <strong>de</strong>termiva<strong>de</strong> quo<br />
filmes em sebstretos amorfo ■ ■ ao eristslinos mend° o substrate i aqueeido<br />
amorfos gamed° este i mentido ■ temperature amblente. Filmes ereseidos am ■ ubstrine<br />
■ cristalinos (ECK s Ellr) ■io sempre eristalinos. Todos os filmes eristalino<br />
■ *presents'. mediae as transicae ■ <strong>de</strong> lase ems sows temper rrrrrr qua o erlstal.<br />
* Tambim do Depto. <strong>de</strong> Ens. <strong>de</strong> Telecomunleacies. Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral Flamingoes<br />
▪
(DEF/PAINEL r- TSCIMENTO EPITARIAL DE InGeAsP CON BAIXA SATURACAos POSSIVEL<br />
APLICACAO EM POCOS QuANTICOS". Jose Roberto Caumo e Nilson Carvalho Junior -<br />
CPqD-TELEBRAS - 13.085 - Campine'. SP.<br />
Cama<strong>da</strong>s.<strong>de</strong> InGaAsP cresci<strong>da</strong>s per epitaxia <strong>de</strong> faselLqui<strong>da</strong> comrbaixa satura-<br />
cio do solugao, apresentam uma taxa <strong>de</strong> <strong>de</strong>posigio bastante balsa, sendo posalvel<br />
o crescimento <strong>de</strong> cama<strong>da</strong>s fines. Serio apresentadoe os resultados <strong>de</strong> crescimento<br />
<strong>da</strong> lige quaterniria InGaAsP (A 1.3um) usando solugio <strong>de</strong> crescimento com super-<br />
eaturacio <strong>de</strong> 8T=0.5 C. Serio discuti<strong>da</strong>s as possibili<strong>da</strong><strong>de</strong>s <strong>de</strong> crescimento <strong>de</strong> pogos<br />
quanticos utilisando eata tecnica.<br />
DEF/PAINEL 1 CRESCIRSNTO DE BETRIMMUMMDMURRA DE GaAs/GBP.1as FOR MDCVD A PRESS&O<br />
ATMOSFARICA. - Aldionso M. Machado, Marco A. Sacilotti Isom A. male (CPqD-<br />
TELEBRAS).<br />
Da um reator horizontal I pressio atmosferica, estamos crescendo umbra substratos<br />
<strong>de</strong> GaAs com orlentagio (100), cama<strong>da</strong>s epitaxisis <strong>de</strong> GaAs e GaAlAs com o objetivo<br />
<strong>de</strong> otter heteroestruturas pars a fabricagio <strong>de</strong> Laser e outros diaptmitiv:a . As<br />
cama<strong>da</strong>s ji cresci<strong>da</strong>s apresentam morfologia, proprie<strong>da</strong><strong>de</strong>s Opticas e eletricas<br />
iguais aos valores medics disponiveis na literature. Estamos levantando as curves<br />
<strong>de</strong> taxa <strong>de</strong> crescimento s proprie<strong>da</strong><strong>de</strong>s eletricas <strong>de</strong>s cama<strong>da</strong>s, em fungi° doe diver -<br />
soe parimetros <strong>de</strong> crescimento.<br />
----71117-EXPERIDIENTOS 1)Er/1<br />
DE CO-RECOZIMENTO DE SUBSTRATOS DE GaAs e InP EM<br />
ATMOSPERAS MOVPE DE CRESC/MENTOS DE CRISTAIS. Marco A. Sacilotti (CPqD-TELEBRAS)<br />
Sandra C.C. Castro (I.F. Unicamp), Remo A. Maaut (NRC-Cenadi).<br />
GaAs e InP sio materials bAsicos utilizados come substratos on<strong>de</strong> sic cresci<strong>da</strong>s<br />
cama<strong>da</strong>s epitaxials, contend° elementos dos colunas III e V. Entre os tipos <strong>de</strong><br />
crescimentos epitaxials, encontra-se o WIPE (Metal-organic vapour phase epitaxy).<br />
o qual utilize hidretos comp N2, AsNl. Pilo, etc. A interagio <strong>de</strong>stee hidretos tom<br />
substrates e a troca <strong>de</strong> espicies (evaporadoras <strong>de</strong>stes) entre estes proporcionam<br />
informagias valiosas sobre especies presentee durante crescimento epitaxial MOVPE.<br />
Neat@ trabalho preten<strong>de</strong>mos apresentar resultados <strong>de</strong> co-recozimento <strong>de</strong>stes <strong>da</strong>is<br />
tipos <strong>de</strong> substrates, bem come a caracterixagio <strong>de</strong>s superficias <strong>de</strong>stes apes o tra -<br />
temente termico. Com estes resultados nos A poselvel &presenter mo<strong>de</strong>lo prellminar<br />
<strong>de</strong> crescimento MOM.
I DEF/PAINEL<br />
CrePAPirjelinie AS is alinerrat E DiKkruM NA nESCIPirld 1 stelticrA<br />
re ilePiexio ernalwa DE TREND u. LE BILICIO EOM AVID CHAU LE ZEMMOL).<br />
Gingalves, 0.13.(iEAIERJ), Scheid:sr, J. (HHZ-Berlin). Graaf, H. (IMI-Barlin)<br />
Atravis <strong>da</strong> difrataretrin gam can radio* <strong>de</strong> 0.0392 R. realism-se no HPU <strong>de</strong> Berlin, una<br />
sistardtica <strong>de</strong> sedi<strong>da</strong>s an orracristais <strong>de</strong> Engel° acts alto gran <strong>de</strong> perfeicio, clan o objetivo <strong>de</strong><br />
se estu<strong>da</strong>r a potencia <strong>de</strong> reflexive integrads. Varlasb-se a asp:wawa do erlatal entre I e 4 an<br />
asses dodos fore camanrodos can resultados <strong>de</strong> teorlas =antes utilinando-ra o enfcgue &nand:<br />
oo MAIM a baths circuit's° (DAININI. Os resultadoe arantaa a possibili<strong>da</strong>le <strong>de</strong> existencia <strong>da</strong><br />
clusters <strong>de</strong> calginio qua seri= responsivais per um espalIvinanto &fun nao <strong>de</strong>sCX1t0 piles<br />
aonsi<strong>de</strong>ra<strong>da</strong>s.<br />
DEFFPAINEL I 15PECTROSCOPIA FOTOACBSTICA APLICADA A MATERIALS TRANSPARENTES.<br />
A.C.Ilento, R.Vargas (Institute <strong>de</strong> Visite - UNICAMP - 13.081-Campinas ■ 111). M.M.P.<br />
d'Aguier Note( Institute <strong>de</strong> <strong>Fisica</strong> - UPS.. - 40.000-Salvador-RA ), L.C.M.Niran<strong>da</strong><br />
(Lab.Associado <strong>de</strong> Se 00000 s e Nateriais-UPB/FICT - Sio Jos: dos Campos, 81'.)<br />
O mitodo for ice aplicado pare miasmas amostras <strong>de</strong> q Was. A quao<br />
t1<strong>da</strong><strong>de</strong> fisice usa<strong>da</strong> come porimetro tirmico monitorado, 'I a difosivi<strong>da</strong><strong>de</strong> tirmicm,<br />
■ qua) I <strong>de</strong>termlnods st 000 o <strong>de</strong> <strong>da</strong>do ■ <strong>da</strong> Ease fotodoistica. Em balsa ■ frequiecias<br />
<strong>de</strong> modulegio ■ a difusivi<strong>da</strong><strong>de</strong> armies I obci<strong>da</strong> atravis <strong>de</strong> median <strong>da</strong> difersoge <strong>de</strong><br />
lase entre as iluminagies f 1 a traseire. Es altos frequincia ■ <strong>de</strong> modulagiO's<br />
difosivi<strong>da</strong><strong>de</strong> armies obtids at 000 i o <strong>de</strong> <strong>de</strong>pemdineia <strong>de</strong> dodo, do foss <strong>de</strong>vido<br />
iluminegio froatal.<br />
Amostras <strong>de</strong> vi<strong>de</strong>os dopados con cobalto, is virias concemtrogissoistio send. situ-<br />
<strong>da</strong><strong>da</strong>s per sate milted.. Espera-se obter um mole ■ simples s dirsto ■ pars monitormr<br />
o s 'WAG@ do dopsote, 00000 is <strong>de</strong> mo<strong>da</strong>nca ■ us difusivi<strong>da</strong><strong>de</strong> termica do material.<br />
DEF/PAINEL l—rlse7 clarno a<br />
NA Dgmcg0 (420) g CARACTRRIZACAO DE 1M CRISTAL DE Lir PARA ENTRE-<br />
GO IN AMUSE FOR FRE. Mirlan Aparec i<strong>da</strong> Conclaves. Nelson Batista <strong>de</strong> Lime, Vera<br />
Weis Metro Salvador s SperoNaha Murat. (institute <strong>de</strong> Pesquisas Ewa&<br />
tic.. ■ Muni 1,01/CMEN/SP).<br />
A Farris <strong>de</strong> use semen. cortad ■ a oriental& no direcio (420) foi crescido um cristal <strong>de</strong> Fluo<br />
rota <strong>de</strong> Litho (Lilt) pare ser utilirado comp me cristal snalimadorpara um espectrimetro <strong>de</strong> FIX.<br />
A moments nu forms prlsmitics <strong>de</strong> base quadrs<strong>da</strong> foi extra<strong>da</strong> per corns can <strong>de</strong> Itoa par -<br />
tir <strong>de</strong> um bloco monocrlstaliao orlsotodo per difracio <strong>de</strong> rola -X em an gonlonetro <strong>de</strong> quetro elms.<br />
Apia crescido o crisual tore orientacio verifica<strong>da</strong> can o emprsgo do mesmo mitodo. liminas tom<br />
dimensiiirs dm or<strong>de</strong>m ds OD E 25 X 38.0 foram corta<strong>da</strong>m. poli<strong>da</strong> ■ a posicionadgs am um gonionstro do<br />
equipameoto <strong>de</strong> ERZ. 0 cristal <strong>de</strong> Li? con distincis interplaner 2c1.1.11010 li do direcio (420) amen<br />
to sensivelmente a resolucio as <strong>de</strong>termimacio ds terra. rants aumentando-ss argils a p 000 i o io<br />
tics do equipamento.
DEF/PAINE71 THE 'FRINGE FUNCTION' METHOD 70 MEASURE THE LATTICE PARAMETER OF<br />
AN EPIIAXIAL THIN FILM. By S.Catiche Ellis. Institute <strong>de</strong> FIeiCa 'Glob Wetaghite.<br />
Universi<strong>da</strong><strong>de</strong> Estedual <strong>de</strong> Campine,; C.P. 11105. 13070. Campine,. S.P. Brasil.<br />
The measurement of the change <strong>da</strong> In the lattice parameter of a thin mataxial film (f) with respect<br />
to that of the bulk lb) material <strong>de</strong>pends an the smandifference 61141.-a, in Bragg angles<br />
for the some reflection in both samples. Since dB. when obtained from the direEt measurement of<br />
eg end is likely to have a high relative error, the results generelly'obtained.for Aa are ral<br />
b<br />
etively poor. A new. indirect. method to obtain accurate values has now been dovelopped. The<br />
profile of o well enneolod gn1A nlotn taken un<strong>de</strong>r exactly the ease experimental nondttinns than<br />
those used to measure the profile of an epitaxial film of gold evaporated onto a freshly cleaved<br />
NeCI (DOI) plane. is uned, as usual, to <strong>de</strong>convolute the latter from the instrumental festers.<br />
thus obtaining the intrinsitpfile ire of the film. This result approached quite well the theoretically<br />
expected shape A eingt/t .To explain smell but systematic <strong>de</strong>partures free the theoretical<br />
curve, the Fourier transform of the experimental curve. was calculated: The agreement with the<br />
known 'triangular' &henna the theoretical transform was quite goad except fora modulation<br />
superimposed an the straight lines. This modulation is due to the fact that the =mime are separated<br />
in reciprocal space hy a dintanne e which is simply notated tq AO. 11 is proved that the<br />
transform should be modulated by exp (-2mfke.) (leis the variable of the transform). The period<br />
Ile is then easily obtained. In the sample -enalymed,y.1/e .27 (units of k).wes found. which<br />
corPesponds to a change 6a/a.1.2% or <strong>da</strong>.O.DS As with an arroP of about 4%.<br />
OEF/PAINEL<br />
TEORIA DE Dissz.ocAg5Es PARA A TRANSIO.0 SoLIDO -LtQUIDO<br />
A. Ferrez<br />
Dept ■ <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> Una<br />
A !Laic <strong>de</strong> um cristal pods ser <strong>de</strong>scritaem torsos <strong>de</strong> una aeragaoe expentanea<br />
<strong>de</strong> <strong>de</strong>reitoe estruterals ma ro<strong>de</strong> periodica. Acredltamos quo as <strong>de</strong>clocagaea tam<br />
uma atonic' <strong>de</strong>staca<strong>da</strong> na resale <strong>de</strong> um metal.<br />
Usando um mo<strong>de</strong>l° <strong>de</strong> canoes pare um mils <strong>de</strong> <strong>de</strong>slocagaes, <strong>de</strong>senvolvido<br />
anteriermente, nos agora calculamoe a taus <strong>de</strong> <strong>de</strong>ceimento <strong>de</strong> um estado,on<strong>de</strong><br />
<strong>de</strong>slocegaes primmiticas prollreram liwrsmente ■ pars o estado'liquido.<br />
EF(PAINEL J SIMULACAO MONTS CARLO DA IlA81I00 DE ellOOSIDAD1 DE XEMONIO'ADUMVIDO SR PALA-<br />
9ID (M. A. A. <strong>de</strong> Silva, A. Calle', 5. J. Mokross, LW, Sic Carlos, SF).<br />
A traogicio <strong>de</strong> rugomi<strong>de</strong><strong>de</strong> d tttttt ■ admorcio do Ile emPd lei este<strong>da</strong><strong>da</strong> experimentalmenee per<br />
Miran<strong>da</strong> et al. (J. Ches. Phys., 80, 2931 (1983)) a teorlemesee gaged° s sprosimscio <strong>de</strong> Beth, -<br />
reirle par Csbrer ■ et ■ l. (Physiia, 1271, 173 (1914)) Ap venom estudos em <strong>de</strong>genvolvimento<br />
<strong>de</strong> tel (cis' atraves do mitodo mote Carlo. (FAPSSii, CION, FIIIIP,FIPEC).
DEF/PAINEL ---71 A.J.P. Braga. R.T. Neuenschwan<strong>de</strong>r, F. Decker, C.L. Cesar a A.F.S.<br />
Penna (IFOm - ONICAMP); . J. Men<strong>de</strong>s FIlho e A.S. Martins (U.FC.) e A.C. Oliveira<br />
(UFSChr)<br />
MEDIDAS POTWAR/4.1CM<br />
Medians a difusivi<strong>da</strong><strong>de</strong> termica <strong>de</strong> vArlos materiaia usando um slate.. Foto/was<br />
taco com temperature controladm, bombeado por um laser <strong>de</strong> hr, atravis <strong>da</strong> ticnica<br />
<strong>de</strong> diferenca <strong>de</strong> Ease. Tambem usamos A ticnica <strong>de</strong> "Beam Deflection' em um ■ istema<br />
,elotroquimIco, on<strong>da</strong> o gradient. no Indica <strong>de</strong> rarity/0 sera <strong>da</strong>vldo ao gradients<br />
na concentracio dos Ions em luger do gradients tdrmico nos mitodos convenclonal.,<br />
pars mostrar as possibili<strong>da</strong><strong>de</strong>s qua este mita& oferece na obtain/0 <strong>de</strong> varies pari-<br />
metros.<br />
DEF/PAINEL<br />
TIT/NIP INTERSTICIAL BM SILfCIO<br />
Snolu<br />
GastenBduardnladucis.<br />
Doportansnto do Eletronlcs Quantics (Institute do Ffsica <strong>da</strong> UNICAMP).<br />
Buenos calculando Tlintersticimlou Silfclo.uendo o uStodo tight-<br />
binding semi-ompirico o uotodo <strong>da</strong> Fusco° <strong>de</strong> Croon. Os oIenntos <strong>da</strong> matrix<br />
<strong>de</strong> mcoplanonto do cristel euro con s inpurta.bem cons as auto-onorglas dos<br />
orbitais "d" do impuresa.sso calculados usando os paranetros <strong>de</strong> Harrison (d —).<br />
Bassos commando con calculos "ab initio" (ASV) wands fungi° do Green nip<br />
auto-consistonte.
FiSICA ESTATISTICA E FENOMENOS CRiTICOS<br />
Coord.:- alrgen F.StlIck (IFUSP)
ESI/800/AA.F SOLUCAO ANALITICA DA MACAO DS SCNR6DINGSR UNIDIMINSIONAL. Rodolio Lemma Nina-<br />
co e Guillermo Cabrera Oyerain. Institut° <strong>de</strong> <strong>Fisica</strong>. UMW. Campinas. S.P.<br />
O trabelho estu<strong>de</strong> um novo milted* <strong>de</strong> itermtio <strong>de</strong> mettla <strong>de</strong>.trenemissio. A fineli<strong>da</strong><strong>de</strong><br />
<strong>de</strong>nte i ebter user representscio integral (<strong>de</strong> Rieman) pure este Storni*. fornece;do-nom ester uma<br />
valuta° anslItica. suscethrel ■ ser enellea<strong>da</strong> rapi<strong>de</strong>mente. pars quslquer potential erbitririo.<br />
Sapecial etenqi se di see poteneiele reelensie que spresentaasolution elgibrices.<br />
EV/8:20/ 11A.F EXCITAcORs NAO LINEARES EN SISTEKAS MACNETICOS DESORDENADOS<br />
C.E. Cor<strong>de</strong>iro, Inetituto <strong>de</strong> <strong>Fisica</strong> - UFF<br />
▪<br />
Investiqamos a existencia <strong>de</strong> en<strong>de</strong>rs solitbrias emums ca<strong>de</strong>ts. linear<br />
magnetica <strong>de</strong>sor<strong>de</strong>na<strong>da</strong>. Trabalhamos diretamente com-os operadores <strong>de</strong> .Spin, analisando<br />
a equagio <strong>de</strong> evolucio <strong>de</strong>sses °paradoxe ■ na representagio <strong>de</strong> spin -coerente<br />
<strong>de</strong> Radcliffe. A estabili<strong>da</strong><strong>de</strong> do solugio <strong>de</strong>ata equagiio. no presenca.<strong>de</strong> um campo<br />
magnetic° extern 6 estu<strong>da</strong><strong>da</strong>.<br />
777;17 corranucTio DR 'IRATE= PARA 0 PATO& ni OMURA OIRIMICA DE S1STRMAS<br />
MACNgTICOS QUASI-UNIDIKENSIONAIS - Costa a A.S.I. Pires<br />
Departamento <strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Nines Garai ■<br />
A contribuisio <strong>de</strong> breathers sine-Gordon pare later <strong>de</strong> e tttttt ra dicisico. S(Q.SO i macula<br />
<strong>de</strong>rmatitis'. farm anti-fewromassities. 0 tesultado (erre i comparedo cam <strong>da</strong>dos saperimentals.
ZST/9:00/4A.F J FROPACACAO DE UM DEFEITO NO MODELO OE ISINC A TRES DIMENSOES<br />
Urlel Me<strong>de</strong>lros do Souza Costa - Univ.Fed.<strong>de</strong> Alagoas<br />
Nos estu<strong>da</strong>mos, utIllzando a ■ated° <strong>de</strong> Monte Carlo. a Awolucio temporal <strong>de</strong> dugs<br />
conflguragaes trldlmenslonals <strong>de</strong> Using qua dlfere ■ &penes polo spin 1.Mo<br />
nitorando a propagacio do <strong>de</strong>felto. ob 00000 mos ;ma transicio <strong>de</strong> fame pars um va<br />
lor <strong>da</strong> temperature em concordincle coo a temperature crrtIca <strong>de</strong> parcels's'', <strong>de</strong><br />
sitlos cons correlasio <strong>de</strong> Icing.<br />
177707117.1 TWO-DIMENSION DIPOLAR SYRTEH.A MOLECULAR OTNAMICS STUDY - S.A.E. Norms% R.<br />
Lobo e 0. ulpOlito - IIKISC-11SP<br />
No consi<strong>de</strong>r a molecular dynamics simulation of a 2-dimension dipolar system un<strong>de</strong>r periodic -boun<strong>da</strong> -<br />
ry condition. The dipoles are ma<strong>de</strong> up of 2 charged particles oe and -e, with mama mass subjected<br />
to a fixed distance ;wastrel° equation; individual charges interact via the logaritmie mad a<br />
short range repulsive potential. The dynamic dieletrie constant c* will be study as a function of<br />
temps and dipole moment of the spates.<br />
0) WIMP<br />
ir e<br />
rcTig:40/4A.F ( BIOGEMESE: UMA SIMULACAD COMPUTACIONAL. Hans J. Herrmann' e Cons<br />
tantino TsatisalCentro Drasileiro <strong>de</strong> Pesquinas <strong>Fisica</strong>. -Rio <strong>de</strong> Janeiro). 0 cresci<br />
mento, a partir <strong>de</strong> °Usti:nerve. <strong>de</strong> polimeros codificados a autorepliciveis for<br />
uma etapa crucial <strong>da</strong> BiogOng,g, tal comp entendi<strong>de</strong> atualmente. Aso longo <strong>de</strong> 11-<br />
nhas recentemente propostas', almulamos no comeutador ums 'sopa primordial'<br />
simplifiea<strong>da</strong> pare estu<strong>da</strong>r a cita<strong>da</strong> etapa. As molecules iconstitui<strong>da</strong>s por a<strong>de</strong>nine<br />
tisane, citosina e guananinel sio aupostas linearea: aua difusio 6 suposta<br />
bidimensional anisotrdplca. observamos, em nivel microscopic:). diversi<strong>da</strong><strong>de</strong> e<br />
selecSo <strong>de</strong> tipo <strong>de</strong>mi:liana no ereacimento,que <strong>de</strong> fato acontece. A influencia so -<br />
bre o comprimonto medic <strong>de</strong> diversos paraoetroa (condiciles iniciais, parimetros <strong>de</strong><br />
difusio. probabili<strong>da</strong><strong>de</strong>s <strong>de</strong> ligecoes auto -catalizadoras A-7 a CC, tempo) 6 exibi<br />
<strong>da</strong>.<br />
len<strong>de</strong>reco peraanente: Service <strong>de</strong> Physique Theorique o CiA-Saclay-91190 Cif sus<br />
Yvette - France<br />
Ill C. Teallis and R. Ferreira. In 'Statistical Physics' , ed. H.E.Stanley, 336<br />
11906l North-Holland !Physics A 140).
ESTAL0:15/AA.F_IDIAGIAMAS DE PASS AA DA MAIO SEAL -INFIRM ODA CAMPO TRAMSVABSO H AADAPIZA00<br />
AA SUPAIOICIA*. T.Kaneyoshi - Univaraity of Nagoya. Dapartemmot of Physics, Nagoya, Japan; and E.F<br />
Memento - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Alagoas, Departmesto <strong>da</strong> Haim, Mamie% Brasil :<br />
Diagrams <strong>de</strong> fess am um mei° semi -infinito (Ising) coot camp* transoniso amorfiangio as superfici"<br />
sio estu<strong>da</strong>dos Heaves do uma tmoria <strong>de</strong> campo ofetivo. 1 mostrado qm quando o campo transverse fib<br />
aummta <strong>de</strong> :aro. T b mai <strong>de</strong> sou valor no mo<strong>da</strong>l* do Islng a allege sem no valor crick.° UP .2.35Jb ,<br />
a para %Kit &pews ems transicio <strong>de</strong> Ease superficial a possivel <strong>da</strong>pan<strong>da</strong>ndo dos valaree<strong>de</strong> Do e Js.<br />
En tttttttt t pars 0114 At o slates. °e<strong>da</strong>m na mpoeficia ante ■ do volums pare valors J mace quo<br />
um certo valor critic* J s . diminuindo a temperature o state= 'preempts respectivamants dum<br />
transigie ■ <strong>de</strong> Issas. a <strong>de</strong> superficia m ■ <strong>de</strong> volume. Para este case fixado um valor pars Lib .<br />
noires& qua o feim do amorfisacia na suprfTcla i summit's o valor <strong>de</strong> J im e diminoir a raglan<br />
<strong>de</strong> superficie ferromagniticm. 0 fenameno <strong>de</strong> reentrincla a possival na suporficie <strong>de</strong> um male semi-<br />
infinite cam campo transverso a smorfiaacio na =partici., quando J s turns-am m Mato manor qua<br />
j a J (in ttttt io anus spins an superficial a anus vlminhes priximos an primates amnia) i tomado<br />
b I<br />
comp an valor mato manor quo J b.<br />
▪ Trabalho parcialmente financiado polo CRPq FINED<br />
E51/10:35,4RA<br />
PRASE DIAGRAM OF THE BANDON-VI= tat= NOOID. WITH A TR1DMAL DISTRIBUTION<br />
Rafael 11.Sebasciane ■ and V.K.Sasena Ompartamento <strong>de</strong> <strong>Fisica</strong>. UFSC<br />
The random-field 'sing mo<strong>de</strong>l, with a trimo<strong>da</strong>l distribution (elm of chreag functionm).is studled<br />
within the man-field approximation. The averaged free energy and or<strong>de</strong>r parameter ars<br />
analysed in <strong>de</strong>tail. numerically and through the Lan<strong>da</strong>u expansion. to construct the complete<br />
phase diagram in the parameter space of the ayatem. A line of trleritical points. ending at a<br />
vestigial telecttical point, le obtained, a result also stigmata vacantly by Mattis. Some new<br />
features of the phase diagram are also reported.<br />
E5T/10:55/4A.F ADDELO El !SING COM Dumb CORRELACIOMADA NA REDS OK BUM-EASE 9110RO OE SPIN<br />
Jerald's Borges <strong>da</strong> Silva, Sergio Coutinho e Francisco E. Brady Morales. Department° <strong>de</strong> <strong>Fisica</strong> -<br />
UT E.<br />
A temperatura critics <strong>da</strong> fame vi<strong>de</strong>o-<strong>de</strong>-spin do mo<strong>de</strong>lo do laing can diluigio ■lonaria<br />
correlaciona<strong>da</strong> entre ■itim e Mistime foi estu<strong>da</strong><strong>da</strong> ne ro<strong>de</strong> <strong>de</strong> Bathe cm 'Eimer° <strong>de</strong> coor<strong>de</strong>navio<br />
.rbitririo. Neste mo<strong>de</strong>l*, o valor e o sinal <strong>da</strong> constant, <strong>de</strong> scoplamento dm interagio <strong>de</strong> interambio<br />
entre doll atoms mogniticos esti° correlacionados cos s ocupacio dos atlas visinhos.<br />
<strong>de</strong>ars Ligagio, per items magnitims. Para usa <strong>da</strong><strong>da</strong> concentragie <strong>de</strong> atoms magniticos, o sistemo<br />
pods exibir efeltos <strong>de</strong> lemtragio <strong>de</strong>vido a Otstribulgio plata alestaria <strong>de</strong> ligscias ferro a antiferronagniticm<br />
cm vi t i tt coestantes <strong>de</strong> acoplamonto. A lisha critics <strong>da</strong> lase vidro-<strong>de</strong>-spin. no<br />
diagrams temperatura crTtica versus goo (Sep), foi obtlds exatamente a estu<strong>da</strong><strong>da</strong>. para<br />
viriom valorem do parlmetro <strong>de</strong> competicio a do milmeo do enordonagio <strong>da</strong> redo.
ES7/11:15/4A.F] ESPESSURA CRITICA OS CAMADAS EFITAXIA1S. Soso Crenate, NCT/Instituto <strong>de</strong> Pesqui<br />
■as■ Espariai ■ - IMPS. CP: 515, 12201 - SJCampos, SP, Brasil: .1.11.1ostsrlits s<br />
S.C.tint, Brown University, Provi<strong>de</strong>nce, RI 02912, USA.<br />
Apresenta-se uma toria <strong>da</strong> esti:bla<strong>de</strong>d. <strong>de</strong> roula<strong>de</strong>s epitasiais cresci<strong>da</strong>s em substrato<br />
cam perimstro <strong>de</strong> ro<strong>de</strong> diE . Elestici<strong>da</strong><strong>de</strong> <strong>de</strong> meios continuos i usa<strong>da</strong> pars cads cama<strong>da</strong> loss o<br />
scoplamento entre as cama<strong>da</strong>s i trate& <strong>de</strong> forma di . Ap -se tambim um cilculo variacio<br />
nil que passel boa<br />
rdintl tom os cilculos exatos. A principal vantages <strong>de</strong> nom mitodo i o<br />
<strong>de</strong> permitir a malls. <strong>de</strong> astmbili<strong>da</strong><strong>de</strong> <strong>de</strong> configuring-ie. arbitrirlas <strong>de</strong> super-redos.<br />
E51/11:35/4A.F SSTDOO DA CIMETICA DE °IMMANENT° EN SbC1 q-CIC e AlC1-GIC.<br />
ATRAVES DE RPE. S.Rolla. L.C.Walmsley C.Rottoris (Institute <strong>de</strong> Flails <strong>da</strong> Universi<strong>da</strong><strong>de</strong><br />
Estadual <strong>de</strong> Campleas - UNICAMP).<br />
Esperimento <strong>de</strong> p _ Ignition eletrOnica permitiu-nos estu-<br />
<strong>de</strong>r ci ' <strong>de</strong> or<strong>de</strong> 00000 to mum. transiqao <strong>de</strong> foss or<strong>de</strong>m-<strong>de</strong>sor<strong>de</strong>m, quasi-bidi-<br />
manila:Bal. observed. a tamper aaaaa (210y2)e em grant. Let !ado tom SbC1 c ,<br />
■stigio (161122)K em greats toterealado tom AlCl a , estigio 7. Um reafrii-<br />
mento ripido partir <strong>da</strong> face <strong>de</strong>sor<strong>da</strong>na<strong>da</strong> ( TOM ) revel; um ■unset* do largura<br />
<strong>de</strong> limbs is fungi° do tempo cujo comportsmento i cproporcional ■ ( e). Mos still<br />
buimos uses variacio temporal <strong>de</strong> largosa <strong>de</strong> linha so crescimento no tempo do tams<br />
she midio <strong>de</strong> dominios <strong>de</strong> ums super-rsd 1. 0 .juste dos<br />
<strong>da</strong>do ■ esperiue aaa i a forests n'00.48 pars La e s 1010.55 par. 7.7 no tfo do SbC1 6 CICs, estigio 4 o=0.42 pare Tef<br />
c em AlCl i-CIC., estigio 7. of exp 00000 s concof<strong>da</strong>mcom<br />
os valorem °bel<strong>da</strong>m per simulacio Monte Carlo par. eresciento <strong>de</strong> dominion<br />
<strong>de</strong> UM8 super-ro<strong>de</strong> <strong>de</strong>g <strong>de</strong>. Observamos uma cinitica suite ripi<strong>da</strong> parts TZT c em<br />
S6C1 sque pod. indicar preetenca <strong>de</strong> um. f (tiro. Cinitless male lances<br />
S 00 observa<strong>da</strong>s apis um tempo <strong>de</strong> sproelma<strong>da</strong>ment 40 sisutOS temp mais<br />
balsas (Te4T c ) os reultados indicam que o sistem ■ sti num sated* congelsdo meta<br />
- I.<br />
Soporte ■inanceiros PAPESP e CNN<br />
F SUPER-atDeS NACMSTICAS: MUMMA ESTXTICAS<br />
Eduardo <strong>de</strong> Campos Vala<strong>da</strong>res - Dept° <strong>de</strong> Elsie., Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Nines<br />
Gerais - C.P. 702 - 30.161 Belo Horizonte, Wines Gerais<br />
Consi<strong>de</strong>rs-se um modulo simples pare use super-r<strong>de</strong> megnities, consistindo <strong>de</strong> interfaces pariEdi<br />
cam <strong>de</strong>scries polo modulo <strong>de</strong> Heisenberg anisotripico spin-1/2, i la<strong>de</strong>s par um mete sacred;<br />
fired° <strong>de</strong> loins spin-1/2. Diagrams <strong>de</strong> (pas diferentes perfls <strong>de</strong> magnetlsecio <strong>de</strong>terminados pe<br />
loo parimetros do mo<strong>de</strong>l° sio discutidos atravis <strong>de</strong> um formaliemo variational, reobtendo -se tier*<br />
sultados ususi ■ <strong>de</strong> tempo midio no limits <strong>de</strong> uma ' interface.
EST/5:00/5A.F ELETRONS OUASE-810IMENSIONAL:EFEITOS OA LARGURA FINITA-CIA CANADA ELETRONICA<br />
JOSE PEDRO R140 NELSON STLIDART - LNIVERSIOADE FEDERAL <strong>da</strong>SA0 CARLOS - LFSCer<br />
sabi<strong>de</strong> qua @lateens mdsorvidos sm um disiStrici :Woo parasnacer ligadof i seperfgelmlu din<br />
ream perpendicular mste,formando us estado kidroggnica discrete,s moven<strong>da</strong>is ■ relativimmnte<br />
livres 'ne direcio per:<strong>de</strong>la a superficim do dieletricd creapartando-se amso um gei hl-dimansionml<br />
clissico.<br />
Estes eletrans eo emram <strong>de</strong>posit:Woe sobs o dial:trice nio formam no ver<strong>de</strong>ds um sista= Ai-dimansion/11<br />
no sentido matmiticomes exists :es espm sssss finite <strong>de</strong> came<strong>de</strong> eletrinica.<br />
Rosso °Native: sere o do estu<strong>da</strong>rmos a Oman <strong>da</strong> lergure finite dm cams<strong>da</strong> eletrimicm na enemas<br />
do estado fun<strong>da</strong>mental a Pater <strong>de</strong> sstruture matitico.atravds <strong>da</strong> aproalmogia ds Campo Auto Conchatents.<br />
3<br />
EST/8 20/5A F<br />
PROPRIMIADER TesisosmAxicAs LO, um GAS Ds sou<br />
IDEAL ULTRARELATIVISTECO EM PARAR8TAMiSTICA<br />
Melquise<strong>de</strong>eb 8. Silva 0 Hi<strong>de</strong>mbergue O. Prota-U.Amasonas<br />
Sylvio Goular Rosa Jr. .- 'MSC.<br />
Discutimos as preprie<strong>da</strong><strong>de</strong>s termodiamigas.di um gas_<br />
<strong>de</strong> Rose i<strong>de</strong>al ultrarelativiatico paraestatistic0 em d' dinen0Ses. ea<br />
sumindo quo pare temperatures Rea mc 2 torn-se inportante lever em<br />
consi<strong>de</strong>ragio a producao <strong>de</strong> pares particular-antiparticulas. on<strong>de</strong> o.<br />
miner° <strong>de</strong> particular (N) nio se con . pordn.a diferenga entre es-<br />
te e o miners) <strong>de</strong> antiparticulas (E), M 6 conserva<strong>da</strong>.<br />
T-<br />
FST/E1!00/SA.F PROPRIEDA0118 ELETRICAS DO MUITAT01188 TIACTAIS. 8.8. Com:acme. M.A.!. oma co 6'<br />
C.L. Vascoucelos Departsmento <strong>de</strong> 'Wes. 0790).<br />
Fractais sic opera um tipico <strong>de</strong> vamto intermit . Recentemente astodsmos um cove tipo dm<br />
fractal 2 qua i sniloge <strong>de</strong> diem:sip topsligies dT ■2 do SARA (self-Avoiding Rondos Welk), cuje<br />
0T1. COlculos Moots Carlo par. seta OASIS <strong>de</strong> Mims foram realisadme per Kanter colaboradores<br />
no iltise saes. Aqui estamos ietereasedos. nes proprieds<strong>de</strong>s dlnimicas a <strong>de</strong> equilibria <strong>de</strong>te<br />
atm <strong>de</strong> fractal. TM proprieds<strong>da</strong>s for estu<strong>da</strong><strong>da</strong>s 6 - <strong>de</strong> madi<strong>da</strong>s <strong>da</strong> resistincia elOtries<br />
dosses objetos, construidos taut° cum materiais orginico quarto metals. gofase particular O<br />
<strong>da</strong><strong>da</strong> is flutumcOes <strong>da</strong> rest ss ss is elOtrica dosses resistores. A utilieacio <strong>de</strong> ca92omeates alOtri -<br />
cos di ircultos coo o gismo tips <strong>de</strong> geometria f 1 discuci<strong>da</strong> no referencia 2 este<br />
rondo pesquisa<strong>da</strong> pekes autores.<br />
11.11. Ase<strong>de</strong>lbrot, "The F 1 Geometry of Nature" (Freeman, 1983).<br />
M.A.F. Comes, J. Phys. A : Math A Con. 4110 imprepOi0 (1987)<br />
T. Kantor, M.Kar<strong>de</strong>r e A.R. Nelson, Phys. Rev. Lett. 57, 791 (1986)<br />
S.V. Cavil . M.A.F. Gums e C.L. V los, J. Phys. A : Math A Con, a sec ubmatido.
.ESI/9:00/SA.F<br />
ON MODELS EIAIONENTE OiLiVEL NA NE06 IRIAONODAOl-<br />
RECIDNASA P. N. <strong>de</strong> Oliveira s S. ilk 9l Oilrnil i TUFF Nllurol Ail<br />
Noma reds direcions<strong>da</strong>, as lipase transmits.' inforeag:s ape-<br />
pas no iodi<strong>de</strong> dos sicos rrrrrr pen<strong>de</strong>nt's. Usa inforeaglo Roe parts ds<br />
wigs. po<strong>de</strong>ri ficar Mafia masa ragas Halt. se ■ tk., os Is Woods,<br />
in<strong>de</strong>fini<strong>da</strong>menle is Is i a concentrasio <strong>de</strong> Iigacaas pielentOSI.<br />
42-aarrelacila ■ ne direg4 diagonal aprommtae us espoeste critico di.-<br />
tinte flagpole correopon<strong>de</strong>ats a astray direcie ■ a pertir <strong>de</strong> moms arils..<br />
Ts.b.r lakes. t Is spressota ■ u ■ terceiro moment..<br />
Define-ss us endue cos sates Carstteristica ■ ■ pretends-se dis-<br />
co<strong>de</strong> suas.isplicaOss e ■ rele4s cos o problem. <strong>da</strong> percolagli.<br />
EST/9:29/5A.F ESTRUTUNAS DIOSIPATIVAS SN SCNIDOSDSTORSS FOTO-SIDITADOS. Tani. Tend. Institu-<br />
to <strong>de</strong> ■isica do U i<strong>da</strong><strong>de</strong> <strong>de</strong> Sio Paulo.<br />
Analisamon a townie <strong>de</strong> e rrrrr ors. dissipativas em matdria condoma<strong>de</strong> stod ■ <strong>da</strong> metodologia<br />
ecAnico-oetactetics. Para ccccc recorremos ao mdtedo do oparador erratfatico <strong>de</strong> nio-equilibri<br />
a <strong>de</strong> Inbar... Feta ternoleglo terse. agonies <strong>de</strong> transports nice-lifters. quo presci<strong>de</strong>n <strong>de</strong> quidsquer<br />
coeficiontes fenonenelfigices. A epees aniline tai elebora<strong>da</strong> pars os plasma' en esmicendotores<br />
attempt. Coto-ancitados. Desenstramos qua pertir <strong>de</strong> an nivel critic° <strong>de</strong> antitank, ones sinem'.<br />
pods softer aaaaa igio <strong>de</strong> we regime <strong>de</strong>sor<strong>de</strong>nedo pars us regime mecroscopicamente or<strong>de</strong>nado. Este<br />
Old.° d caracterimedo per estruturas espagislmente auto-or<strong>de</strong>na<strong>da</strong>s as forma <strong>de</strong> on<strong>da</strong>s <strong>de</strong> <strong>de</strong>nsi<strong>da</strong><br />
<strong>de</strong> <strong>de</strong> cargos esteciondrias.<br />
EST/9:46/50.F 1<br />
A Entroola a o Flu= <strong>da</strong> Entropia pars um Gin DiatOmico<br />
-G. N. Kremer - Dpartamento <strong>de</strong> <strong>Fisica</strong> - UFPA<br />
0 obletivo <strong>de</strong>st trabalho i a obtangio <strong>da</strong> antropla a do Elmo <strong>da</strong> entropla para o<br />
case <strong>de</strong> % gasi cujas moliculam possuem samara/a vibrational qua is encontra as<br />
we estsdo fora do equIllbrlo.<br />
As expresso', obti<strong>da</strong>s atravis <strong>de</strong> teorla estatIstica a <strong>da</strong> teorle <strong>de</strong>s flutuacEses<br />
contem Lemnos ate a segun<strong>da</strong> or<strong>de</strong>m nag varavelse energla especlfica vibrational ,<br />
tensor pressioe flu= <strong>de</strong> calor iranalaclonal e flu= <strong>de</strong> calor vibrational.<br />
Apoio
OVD:15/5A. IFFUNCAO<br />
DE PADTKAO DO MODEL° DE POTTS CON1NTESACAO MUMS NA<br />
REM TkIANGULAk Roberto<br />
Nicolau .Onody (I FOC .USP)<br />
0 mo<strong>de</strong>l° <strong>de</strong> Potts con interagio <strong>de</strong> 2 e 3 spins.na reds trilingular 6 ma -<br />
peed° num mo<strong>de</strong>l° <strong>de</strong> seis vertices. Esse mo<strong>de</strong>lo <strong>de</strong> vertices viola a 'inveriencia .1,<br />
11 00 permitindO. portanto. a &Meagan °pate <strong>da</strong> funsio <strong>de</strong> partici° via aqinicoaa<br />
<strong>de</strong> Yang-Baxter.<br />
E5T/10:35/5A.FITRANSIO0 DS OMR CONTINUA DO MOULD DE POTTS NA WORE DS Cann:<br />
ZEROS DA rump° De PAATICAO - S. Corollate Roma Jr. a F.A. Bosco -<br />
IFQSC/USP - Rostra's°s quo o mo<strong>de</strong>l° <strong>de</strong> Potts p-estarloa gas S <strong>de</strong> Coyle, forebo<strong>de</strong><br />
posaul mum 'coo <strong>de</strong> fame <strong>de</strong> or<strong>de</strong> ■ continua. quando is cossi<strong>de</strong>rs es @Felto <strong>de</strong><br />
■uperficie ds ro<strong>de</strong>. Data<strong>da</strong>ops aria transigdo do panto <strong>de</strong> vista dos sores <strong>da</strong> fogaci<strong>de</strong><strong>de</strong><br />
<strong>da</strong> funcilo <strong>de</strong> particla do mistime, verificando o teoreua <strong>de</strong> Yang-Les someone<br />
no case p ■ 2. 0 conjunto dos soros 0, 04 limits ***** dinSnico, o conjunct' <strong>de</strong> Ju<br />
Its do nape <strong>de</strong> Setbe-Peieris, no regime <strong>de</strong> balsas temp rrrrrrr 4 um conjugate <strong>de</strong><br />
Cantor (poeir ■ <strong>de</strong> ■tou) ■ ■ altos temp<br />
FST/10 55/5A.F lustros DE FLUTUACISES NA TRABSICAO DA PASS DO IMAM no 10121011C10<br />
SOB PRESSAO. Marcie C.Darbosa e Walter ILI% ■ Institute <strong>de</strong> Ffeica <strong>de</strong> Uolversi<br />
<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Rio Gran<strong>de</strong> do Sul.<br />
Utilisa-se o grupo <strong>de</strong> rrrrr uslisegio pars o mo<strong>de</strong>l° <strong>de</strong> Pact. <strong>de</strong> trim estakm, no tee<br />
ris <strong>de</strong> tempos continuos Co. quebras <strong>de</strong> simetria, pars sstu<strong>da</strong>r egoism; <strong>de</strong> !tutus-<br />
cies no rrrrr icio <strong>de</strong> Ease do titanato <strong>de</strong> eatrincio sob p Edmund* uma dire<br />
tie 11+0, 1.41, d se 1. D ins -se a rrr r 6 /6 mitre os parim rrrrr erfti<br />
c t<br />
cos a tricriticos, d c e d t , mostrando quo as flotoeciee ■ rrrrrr sic universal a ra-<br />
tio obti<strong>da</strong> en teoria <strong>de</strong> taupe midis a quo o efeito a sufieienteuente grand@ pare<br />
mar <strong>de</strong>tectado experimentalmente. A nio-universali<strong>da</strong><strong>de</strong> <strong>de</strong> ree ves erfticas a tricrf<br />
tiros a resulted° <strong>de</strong>s ail di doe perimetro ■ no ponto critics a tri<br />
critics gerados pens grupo <strong>de</strong> renormalisacio. Retu<strong>da</strong>-se timbal' a Emma <strong>de</strong> 'scaling"<br />
do equocio <strong>de</strong> estado Cu torno do panto crftico a tricritico.
E5T/11:15/54.F NOM.° pa 0lLulgA0 CORRELACIONADA PAM SISTEHAS MACSIXTICOS<br />
Milton ds Silva Branco. laimun<strong>de</strong> Rocha doe Sautes Simla Luis Alves <strong>de</strong> Queiroa<br />
Osan<strong>da</strong> a ratado do Crupo <strong>de</strong> Renormalisac:a no !imago Real. rtu<strong>da</strong>moa. ris redo<br />
quadra<strong>de</strong>. um an<strong>de</strong>l° <strong>de</strong> dllnicla lacionad. proposto_por J. Albino O. <strong>de</strong> Alma's et al (J.<br />
of Mag. Mag. Hat., 96-S7 (1986) 107-108). an<strong>de</strong> ■ interagao entre <strong>da</strong>is ships primeirimi viainhe ■<br />
<strong>de</strong>pends <strong>da</strong> acupagio <strong>de</strong> ' ' ■ viainhem so longs. <strong>da</strong> limbs quo op une. A Hamiltonian& pods aer<br />
amanita came:<br />
it-- J .<br />
i s il 141 ; Si 21<br />
io<br />
S. S.<br />
J 1.1 . 6 r i46 4 (I -n) 1;1 _ 6 n]<br />
r. 1<br />
omit ti i uma variivel qua pads assamir os valorise 0 1. cam probsbili<strong>da</strong><strong>de</strong> (1-p) p. respecti-<br />
vamente. a i o parimetro <strong>de</strong> correlagie 6 i on vital <strong>da</strong> redo.<br />
Sin spresentadom on diagrams' <strong>de</strong> Lase Temperature critics can gio.<br />
pare 0 < a < 1.<br />
EST/11:35/SA.F DIAGRAMS DE rAsEs DE UN ANTIFERRONAGNETO COMPRESSfVEL -Jair Libero<br />
Cadorin a Wapner Flaueiredo (Departamento <strong>de</strong> <strong>Fisica</strong>. Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa<br />
Catarina).<br />
0 diagrams <strong>de</strong> fames no piano campo magnetic:" versus temperatura <strong>de</strong> um antiferromag<br />
neto a <strong>de</strong>terminado its fungi* <strong>de</strong> tensao externs. Conel<strong>de</strong>ramos aqui um mo<strong>de</strong>lo magne<br />
to-elistico bastante simplificado . on<strong>de</strong> as forgas <strong>de</strong> cisalhamento <strong>de</strong>spreza<strong>da</strong>s .<br />
Atravie <strong>de</strong> urns transformagio unitarla apropria<strong>da</strong> aplica<strong>da</strong> so Hamiltonian magneto-<br />
-gaieties, <strong>de</strong>rivamos urns Hamiltonian& efetive <strong>de</strong> spins. As interegaes <strong>de</strong> intercim<br />
blo !Scam agora <strong>de</strong>pan<strong>de</strong>ntes <strong>de</strong> forga externa e pars SO 1/2 surge um parimetro <strong>de</strong><br />
acoplemento biquadritico entre spine viainhoa male proximo°. As fronteiras <strong>de</strong> Cage<br />
sae <strong>de</strong>termina<strong>da</strong>s utilizando um esquema variational <strong>de</strong>ntra do espirito <strong>de</strong> sproximegio<br />
<strong>de</strong> campo medic. Na regiio <strong>de</strong> balsas temperatures a fronteira <strong>de</strong> fame spin-<br />
-flop - paramagnitica a calcula<strong>da</strong> etraves <strong>da</strong> expansio em on<strong>da</strong>s <strong>de</strong> apin. Hostremos<br />
qua a transigio <strong>de</strong> fuse spin-flop- paramagnitice po<strong>de</strong> ear <strong>de</strong> primeira au <strong>de</strong> segun<br />
<strong>da</strong> or<strong>de</strong>m <strong>de</strong>pen<strong>de</strong>ndo do valor assiumido polo parimatro <strong>de</strong> acoplamento biquadritico.<br />
$ feito um studo <strong>da</strong> evolugio do panto bicritico em fungio <strong>da</strong> forge externa a do<br />
parimetro <strong>de</strong> acoplamento biquadritico. Resultados experimentais em antiferramegne<br />
toe compremeLvele sip diacutidos.<br />
EST/11:55/SA.F 1 CAMPO CRITIC° TERNODINAH/C0 ANTIFERRO - SPIN-FLOP EN ANTIFERRONAG-<br />
NETOS UNIAXIAIS - Bartira C.S. Grandi a Wagner Figueiredo (Departamento <strong>de</strong> <strong>Fisica</strong>,<br />
Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa Catarina)<br />
A fronteira <strong>de</strong> Ease antiferro - spin-flop <strong>de</strong> antiferromagnetos con simetrla axial<br />
e <strong>de</strong>termins<strong>da</strong> em fungio <strong>da</strong> temperatura. Nostramos qua o campo critico termodinimi<br />
co nee apreeonta nenhum minima em fungio do temperatura pars quaisquer velores <strong>da</strong><br />
anisotropla uniaxial. Em partiSular mostramoa qua o campo critico varia sasintoti<br />
camente corn UMa lei do tlpo.T 7' 2 . Ease resultado este <strong>de</strong> acordo corn as medi<strong>da</strong>s rea<br />
liza<strong>da</strong>s para o antiferromagneto uniaxial NiC1 2 .61120. Em nossa anilise <strong>de</strong>terminamos<br />
inidialmente os espectroM <strong>de</strong> energie <strong>da</strong>m on<strong>da</strong>s <strong>de</strong> spin nos fames antiferromagnitica<br />
a spin-flop e o campo critico termodinirnico e obtido numericemente atraves <strong>de</strong><br />
igual<strong>da</strong>do <strong>da</strong>s respectivait energies livres. Apresentamos ain<strong>da</strong> os resultadoe obtldos<br />
para a fronteira entlferro spin-flop <strong>de</strong> antiferromagnetos qua apresentam urns<br />
anisotropla transversal no acoplamento <strong>de</strong> intercambio.
E5TiO:00/6A.F I POPTO DE LIFSNITZ NO Nor s IMPORIITSS CRITICOS:<br />
V.Sindilactit. C.C.Secorra e N.F.Oliveica Jr.<br />
0 diagrams <strong>de</strong>rma do Na? no epsco Campo Moan:tie° I Temperature<br />
ea(be Ponies <strong>de</strong> Lifehita (PL). Satsuma raalisndo medi<strong>da</strong> ■ pore dotftlainsr o<br />
asp ALFA, assoeiado so calor eapeciiico, no PL. finalise,' pzeliminares<br />
dos resulted°. ji obcidos, com esmpo magnitLeo waists. use <strong>da</strong>m diseases on<br />
<strong>de</strong> o PL i observed°, scimitar @epeeists" eom valorem muito prosidos dm prima<br />
'aio tsarina em primeira or<strong>de</strong>m gm c.<br />
I E 1 g% 0/6o F i EVOLO960 DR 0)1A101111111CA CAOT1CA.A ?MI ■ DA' COALESCIOCIA DE ATR6<br />
7 s u LVL NAL . Sergio Calaschi.Depto Ing.ilierioa-ESSCAISP ■ 13560- S.Carlos-SP<br />
iambi. no CPqD/Telebraa, C.P.1579. 130115 - Campion, - SP Robert L.Zimmermsa,Dep.<br />
<strong>de</strong> Theirs, FITCL-RP-USP, 14100 - ltibeirio Preto - SP.<br />
A dinamica complex. <strong>de</strong> umm Brau<strong>de</strong> varlet/lo<strong>de</strong> - d ■ lmtemas eliasicos nip II aaa r aa Lem<br />
ai<strong>de</strong>s eatu<strong>da</strong><strong>da</strong> dodo o interims" na comp do avologio <strong>de</strong> sons.aatados. cultic°,<br />
e turbolentos. 0 ablative <strong>de</strong>'s" trabalho 6 alas mmmmm r um pillows nio linger rgido<br />
por spoons dole paramotsoe no gust foi i igad ■ ovoltsgiso do ova tampions din:<br />
mica Canto nivel maperimontal q - <strong>de</strong> simuldqmo mumatica. Tat invent=<br />
sagio mostrou qua a svoimglo dm.dinimica maties, a partir <strong>de</strong> Mo<strong>de</strong>m totalments<br />
dissipativos, 'civil, do coal la do laltiploo Motors. moivariaia. Seri triable.<br />
d' ido o comportamento dinimieo <strong>de</strong> metro' diatoms. nio lingers'. T.1 di eeeee io<br />
visa anfstisar quo o apareeimeato <strong>de</strong> ate eeeeee @strphes gm matron die mmmmm dissipative'.<br />
regido ■ por um minere .aior do 'manatees, pods advEr Cambia do eoperposicio<br />
do ■ rstores uni is do tip. Feigenbaum, uma vas radusi<strong>da</strong> dissipag'io.<br />
Da<strong>de</strong> baixo 'samara <strong>de</strong> mmm i mm tros do mist... per age astoddo sod simplici<strong>da</strong><strong>de</strong><br />
'spell 1, foi posmiooll se obter um ■ complsta sorrelsio antra on experiment°,<br />
a sioulegio assisted. 'insinuate. miasmas q listless as commandmanto<br />
termodinimico do sista. ■ aerio comente<strong>de</strong>s. Fe m a mmmm a til<strong>de</strong>°, <strong>de</strong> kransiviss <strong>de</strong> pri-<br />
meira or<strong>de</strong>rs foram ob dos e mmmmm m aseoeisdoe cos ■s por<strong>da</strong>s do eatsbili<strong>da</strong><strong>de</strong> doe<br />
regimes pariOdico ■ analisados.<br />
E5T/8140/6A.F IA IMMO DA AMUSE OR SIRAISMIIIIRIKROIAIS PARA A 14111211CIA:D1 CADS DETERNI- -<br />
■i<strong>da</strong>dm <strong>de</strong> Sio Paulo).<br />
' (Labe ' <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> Plasmas, inscitoto -<strong>de</strong> <strong>Fisica</strong> dm Delmar<br />
NiST1CO. Nelson Fiedler-F<br />
Rifleman dinimicom dismip quo edibles commandment° camas frommentsmmatmpossumm no<br />
no <strong>de</strong> fame qua i "estrathe. Atratores marathon sip caracterimmdospor um dimmer ,<br />
■ isteman dinimicom pods, no principle, mar feita still<br />
miaaali<strong>da</strong><strong>de</strong> fractal D. A caracterinacio <strong>de</strong><br />
lando vines Lima <strong>de</strong> median ■ (entrap's <strong>de</strong> Rolgomorov, emanates <strong>de</strong> Lyeponov, dimonsio <strong>de</strong><br />
Orsondocif. dismay <strong>de</strong> informal) etc...). Goireemto, ou mean modidm nio ado aplicAvele pant<br />
<strong>da</strong>doe experimentais. ou os alguritmoe disponiveis oio converges pars D > 2. Um Dio<strong>de</strong>s remote-<br />
mote <strong>de</strong>menvo1vid (P. Gramberger a 1. P is, Phys.lev. Lett. 30, 346 (1983)) pare ■ anilise<br />
<strong>de</strong> aaaaaaaa s estradkom, formica no mole pare ea i<strong>de</strong>utificer a dimmosio Insets' <strong>de</strong> ums sirie tempo<br />
ral. Beta dimensio, <strong>de</strong>nomina<strong>da</strong> dimansio <strong>de</strong> Loci°, se exiatir, bonito, tambim uma distincio<br />
entre coos <strong>de</strong>termi a aa ico o rad°. Os siesis mcdidom no caporimemcom em !undo nuclear 2i0 'pip-<br />
priadoe pare a aplicacio <strong>de</strong>nte ■lgoritmo. Cam efeico, este mitodo ji foi utilised° no :::::::: ac<br />
flusuacie ■ em varies tokamake, tenths .ido obtidos reseltados pouco conclusive's. N<br />
seri ap tado algorism <strong>de</strong> Grasaberger e Procaccie o seri dl '<strong>de</strong> ■ Cu. ■plicacio is medi-<br />
<strong>de</strong>s tempera', <strong>de</strong> flotuacies magniticse no Tokamak TER-1 do Lab.Fie.P1samas do IMP%
E5119:00/6R.F O MODELO DE ISINC ANTIFERBONAGIMICO CON iNTERAgOts DE<br />
P110111505 B SWINDON Carmelina M. L. Gomm<br />
e Roberto °sari°, Departsuento <strong>de</strong> Visits. Uni 0000 s<strong>de</strong>cte<br />
<strong>de</strong> Brasilia.<br />
0 uo<strong>de</strong>lo <strong>de</strong> Icing as ro<strong>de</strong> guadra<strong>da</strong> cos intaresims waif viatica'<br />
<strong>de</strong> primeirm vlsinbo ■ a ferromagneticas ou antIferromagniticas <strong>de</strong> ■ egundos<br />
visinhos "presents um_rico diagrsma <strong>de</strong> isms, come revalsclo por mo<strong>da</strong>l°. <strong>de</strong><br />
ceupo midi° a simulagoes <strong>de</strong> Monte Carlo. Ts! mo<strong>de</strong>io a tratado nests trabalho<br />
no aproximagio <strong>de</strong> Kikuchi, com um quadrado <strong>de</strong> primairos visinhos como aglo-<br />
■ernd° basics) con qustr° ■ub-red's. Este problems pods ter formulado como<br />
u m ■apeamento OM 16 dimensZes, qua moo as difermm probsbili<strong>da</strong><strong>de</strong>s <strong>de</strong> cooflguragoes<br />
do sgl do bisico. Os pontos films <strong>da</strong>me map<br />
ponds,' a minim°. <strong>da</strong> energis lure do m i sss ma. Os resulted°s d trio ■<br />
ricae sssss ura do diagram <strong>de</strong> uses e lava,' a ems boa aproximatio pare al<br />
Emcees termodinimicsa.<br />
C57[9:20/EAS IREBULTADOS 'mos DE UN NAPEAMENTO OBBCONTINUO BOIN1E 0 CIRCULO. Mario Jos* <strong>de</strong> 0<br />
' Carlo. B.O. Yokoi. Inatituto <strong>de</strong> Fiske <strong>de</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo.<br />
Asilisamos me 'mills <strong>de</strong> mapementos <strong>de</strong>scontinuoa sabre o drawl°. Nostrums que o ndmero<br />
<strong>de</strong> roteclo emociado no eopeemeoro commitui ume sece<strong>de</strong> do diabo. Obtemos Mrios remsdredos atos<br />
incluindo a expresmia mantic" pars ■ largura <strong>de</strong> co<strong>da</strong> <strong>de</strong>greu <strong>da</strong> ema<strong>da</strong> do diabo. Wand° 'sea expresslo<br />
provisos qua a 'scads d couplet. qua o coujuato <strong>de</strong> pontos assmiadom a ndmeros do rotasae<br />
irrmionsid forms. on conjunct. <strong>de</strong> Cantor <strong>da</strong> dionmsao f 1 mule.<br />
VCT/f19c60/AA_Z I EITUDO DOS "PONTOS DE ACUMULAC,a0" NUM MODELO DE FRINREL-RONTOMMA CON FOTENCIAL<br />
PiRTURBADO. Carlos N.O. Tokoi. institute <strong>de</strong> Oleic. do Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sio Paulo.<br />
Recenteurace Garfield e Moat) eoomidorerso o mo<strong>de</strong>l° <strong>de</strong> Frankel -Kraemer tom potential per<br />
turbado <strong>da</strong>linido pole expreasilo <strong>de</strong> energia<br />
4<br />
(..-uo_ I -T) a %qu o)),<br />
V(a) ■ (AT 1(1-co ■ 2..) E (1 - cos 611.)1.<br />
ales observers= qua a diagrams <strong>de</strong> lases do mo<strong>de</strong>les no piano y-R cane saquincla ■ <strong>de</strong> "pontos <strong>de</strong> acumu<br />
Iasi*" pars ENO. Estes pontos refletem imams." nas condigaes <strong>de</strong> a rrrrr mento dos Milton'. Nds <strong>de</strong> -<br />
terminus°. nusricammte a par on cdiculo analitico aproximado a sequincia infinita <strong>de</strong> "pontos <strong>de</strong> a<br />
cumulation obsermdos na fronteirs do fase w-0.<br />
(I) R.I. Griffiths a V.Chou, Phys. Rev. Lett. 56,1929 (1986).
a -<br />
cer/tn-13/6A,F 1 MODEL° XXE - PEIRA LIM DE EXPOENTE6 CRITIC08. r.bc. Alcaras<br />
(Departamento <strong>de</strong> <strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> 68o Carlos)<br />
Noetramos que a criticali<strong>da</strong><strong>de</strong> dos mo<strong>de</strong>les Potts lq . 41 a Ashkin-Teller po<br />
<strong>de</strong> mar obti<strong>da</strong> do espectro do mo<strong>de</strong>lo XITE. Obtemos a anomalia conforms, =pommels<br />
criticos relevantes e irrelevantes <strong>de</strong>nse mo<strong>de</strong>loa.<br />
EST/10.33/6A F( . '<br />
EFEITO DAS CONDICOES DE CONTORNO SOBRE 0 ESPECTRO DA CADEIA QUANTICA DEBLIINE-CAPEl<br />
Deborah 8. Bilbao a J.R. Drugowich <strong>de</strong> Felicia - IFOSC/OSP<br />
Estudo numdrico do espectro <strong>da</strong> ca<strong>de</strong>ia quintica <strong>de</strong> 81ume-Capel no panto, tricritico.<br />
Os resultados obtidos foram comparados col as previsDes do inviriAncli conforms eas<br />
permitiram construir o espectro a partir <strong>da</strong>.combinaclo <strong>da</strong>s dieensilei 'asst<br />
cia<strong>da</strong>s cos operadores di 0o:iris. 0 ndmero,<strong>de</strong> anomalia conforme.foi. caliulado Wa-<br />
ves <strong>da</strong>s correches 1 energia do estado fun<strong>da</strong>mental <strong>de</strong>. ca<strong>de</strong>ias finites. Finalmente.0<br />
reas condicOes <strong>de</strong> contorno foram.utilixa<strong>da</strong>s pars Invest gar a assocliclo entre<br />
operadores a sues dimensiles. beg come pare calcutar os expoentes criticos - <strong>da</strong>s 'fun<br />
coes <strong>de</strong> correlacao na superffcle.<br />
E.ST/10i33/6A.F I<br />
Bina) DE MODEM 'TIONT-SINCONO" ID DIANTE GRUPO DE<br />
RENORNALIZACIO-<br />
Sergio A. Canvas. Constantino Tsallis-<br />
Centro Bcasilelco <strong>de</strong> Pesoutsas <strong>Fisica</strong>so<br />
formalismo do Grupo <strong>de</strong> Renornalisecio no aspic° real qua esnatitni<br />
ce<strong>de</strong>s <strong>de</strong>)iravals pot ce<strong>de</strong>s hierirquicas tea se mostrado mato aficiente pars<br />
sletenes quinticos magniticos lex. Heisenberg anisotropicol. Neste traba<br />
lho ease formates° i a<strong>da</strong>pted° so estudo <strong>de</strong>, um mo<strong>de</strong>l° "tight-binding' a tem<br />
peratura finita.<br />
Discutimos em particular o caso <strong>da</strong> bands semi-chela. pars o qual<br />
culamos os diagramas <strong>de</strong> Ease s clases <strong>de</strong> universall<strong>da</strong><strong>de</strong> para 4 ■ 1 4.2-<br />
aL<br />
'
EST/11:15/dA.F<br />
MOVIMENTO BROWNIAN°<br />
CRISTIANE DE MORAIS SMITH / AMill ORDACO! CALDEIRA / UNICAMP / IFGW.<br />
Ouando set's°, int dos am estu<strong>da</strong>r o movinento do me partieula brouniano.<br />
<strong>de</strong>paremo-no ■ cam um ngteme dissipative. cuja quentisagdo nip i trivial.<br />
Pars olucioner isto. au diva-ga tenter modifiaer es squall's dm quantizegio, ou<br />
untie allopla-me a icartioula o um rmservatclrio quantize-so o mistime todo. 0 Segundo<br />
procedimnto d qu ■ adotamom. 0 reservettirio 6 rep do per um einjento<br />
do ogailmdores harmonicas o.o acoplammnto pertieule...banho 6 linear.<br />
Como sebum', podsmog obtr to<strong>de</strong> a informegio referents s um dmtmrminado 'cabals<br />
tome mantic° so tomarmom a trope parnellcom reepsito is varliveig do rsrvatario<br />
I do 00000 dor clonei<strong>de</strong>d do wistaria compost°. Mosta mote 6 ecrever o opersdor<br />
<strong>de</strong>nel<strong>de</strong>d raduzido do almtmmm. oujelto a urns concligio mai ■ geral do quo a proposes<br />
por CmI<strong>de</strong>ire-Leggett. Quo oupenham quo inicialmants s partioula o banho matavem<br />
dmmacoplados. 0 remelt's° &doted° d dm integrate dm trajetdrim <strong>de</strong> Fynmen.<br />
EST/11 .'35(6A Fl MICANICA ISTATISTICA DS UNA KSTRUTURA CILULAR ALSATORIA ID. Rita<br />
<strong>de</strong> Almei<strong>da</strong> Jog: Roberto lalenag. Institute <strong>de</strong> 'Ince <strong>da</strong> VDUS.<br />
Pseudo principle dm Minus Zotropla, o<strong>de</strong> congtrokdo ■ um ■ fungi° perticio <strong>de</strong><br />
as gluteus dm um Arma<strong>da</strong> nimero <strong>de</strong> milulag 20 quo p bum aim poro ou uperpon<br />
cis ume'superfIcLe plasm. Cads cilula a dgini<strong>da</strong> por sea postai°, irea, p oo oo tro<br />
simro <strong>de</strong> WOO. entropia a a orgia Huse do inma sio calCola<strong>da</strong>g a va-<br />
lor midi° <strong>de</strong> parim 00000 macrogcdpicog <strong>de</strong>terminados pars a comfiguracia <strong>de</strong> aqui<br />
librio. 0 ■ resultados io compormdoo pars bolbas <strong>de</strong> ■ abia a agrgadog metalirgi-<br />
cos.<br />
ego<br />
EST/11:55/611.0 DIRIMICA DO MODEL° DS KOBAYASHI COM CORRIKAO ARARMOMICA ARLO Mi-<br />
TODO DAS ■ ORS CORTZNUADAS DE NOII-Carlos Eduardo R.Si Notta(Universi<strong>da</strong>d Fa<strong>de</strong><br />
ral dm Cure Prato) e Antonio Simi° T. Pires(Volverel<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Minas C.<br />
✓ale)<br />
O meted° <strong>de</strong> Mori pars a empanel° <strong>da</strong> [untie-memdrig em fr oo I oo coatinua<strong>da</strong>s foi uti<br />
Hoods-no escudo dm dioimica do modulo <strong>de</strong> Kobayashi. Num primeiro egtudo, foram"<br />
i<strong>de</strong>rmdss as [orgasm <strong>de</strong> correlacio dog 'snivels <strong>de</strong> tenons s spins u lei<br />
obald ■ ems largur ■ <strong>de</strong> limbo nio-mule pars o especcro. Escudos posterior' ■ mostrarm<br />
■ qua o fats do se <strong>de</strong>ep f - <strong>de</strong> correlmcdo rrrrr <strong>de</strong>g iatroduna uma<br />
larger. <strong>de</strong> Hobo gem sigoificsdo fisico. Fires <strong>de</strong>ggovolvms um ■itodo pare aaaaa r'<br />
operadoros acopla<strong>de</strong>s. Quando spliced° so :WM, <strong>de</strong> Kobayashi male ■itodo resulton<br />
mama contribuicio hula, por part ■ dos f , pare a largura <strong>de</strong> limbo. A introdu-<br />
gip dm correcio egomania. moo donee ease quadro, p 1 aaaaa eu virtu<strong>de</strong> do cm<br />
racer <strong>de</strong>g aproximacOv ■ utiliam<strong>de</strong>s. 0 nose objetivo fel o <strong>de</strong> procurar °titres .pro<br />
almstis, qua resultsage ■ Rums cantribulgia nio-nula <strong>da</strong>m lemons pars a lmrsura dr<br />
linba.
EST/PAINEL CORRIECLO QUIJITICA DA NANA DO Mims so mac - sings) Luis Tails e<br />
Antonio Sergio Teixeira Picas. Dopartsmonto do <strong>Fisica</strong> MAC<br />
Sari op<br />
mansional (IMMC).<br />
gordon. utilised°<br />
es<br />
sp 70!. Bolo Horizonte. MC. Small.<br />
do a correcic quintica go moon. do waiters no amtiforromagnaco unldt<br />
utilinando o Laredo SSD. 0 rosultado are compared° cos o wiliton <strong>de</strong> eine -<br />
comments como mo<strong>de</strong>ls pars as corrosion giantism do ofolton sio-litiosros<br />
EST/PAIMEL MCRG PARA MOD= DE ISM COM INTERACORS DE MULTISPIM - Nestor<br />
Caticha a J.R. Drugowich <strong>de</strong> Policia xrgsc/usp<br />
Ohtem-.e o diagrema <strong>de</strong> Paseo e as amp:mantes critico. pent um mo<strong>da</strong>l° do Ising coo<br />
interaseses <strong>de</strong> 3 spins em urns <strong>da</strong> ■ dirmsaes. A ticnica utilisa<strong>da</strong> 6 a do Grape <strong>de</strong><br />
Rencrmalinasia via Manta-Carla.<br />
EST/PANEL POOPRIEDADES TERMODIDIMICAS DO MOD= DR RUIDARDs DMA AROIDADDI NUMERIC&<br />
Antonio M.S. Raced., Clindio A. Meads (Department° <strong>de</strong> Ffoica. Dmivaroi<strong>de</strong><strong>da</strong> Po<strong>da</strong>rat <strong>de</strong> Sergipe).<br />
Sotamos investigando propria<strong>da</strong>d♦s tormodimimican do mo<strong>de</strong>ls do Hubbard <strong>de</strong> as. Mods<br />
per um aterd.gom do =eli<strong>de</strong> numeric. divot. no ospago real. Dasemvelvemoa om algorism plus so-<br />
rsa° par computodor do lismiltonianos motriciaio algebricoa pars o mo<strong>da</strong>ls. Resoltadon prolimina -<br />
rem pare suaceptibibi<strong>da</strong><strong>de</strong> magnetics, calor eapacifico, entropio a fannies do =manacle Pare<br />
:intense Co. moony mimeo <strong>de</strong> sitios ■em discutidon.
EST/PAINEL<br />
CONDUTIVIDADE EM SISTEMAS DESORDENADOS<br />
Andrea Wattle a Enrique An<strong>da</strong> (U.P.P.)<br />
Eatu<strong>da</strong>m-se as proprie<strong>da</strong><strong>de</strong>s eletronicas a <strong>de</strong> transports <strong>de</strong> aintereas cam <strong>de</strong>mos<br />
<strong>de</strong>m compositional a astrutural.<br />
Poi <strong>de</strong>eenvolvido um formalism° no qua/ se fee possIvel cassavas a condutivi<strong>da</strong>ds<br />
na forma <strong>de</strong> uma equagio <strong>de</strong> Dyson, o qua possibilitou o seu cilculo utilisan<br />
do tecnica ■ <strong>de</strong> renormalisagio no espago real.<br />
Para slating's unidimensionais resultados preliminares indicam qua a condutiv<strong>da</strong><strong>de</strong><br />
escala-se exponencialmente cool o comprimento <strong>da</strong> amostra.<br />
No caso <strong>de</strong> aistemas cool <strong>de</strong>sor<strong>de</strong>m confiquracional, representados per uma ce<strong>de</strong><br />
<strong>de</strong> Bettie foi pomace/ encontrar uma regiio <strong>de</strong> aetedos locallzados a outra <strong>de</strong> es -<br />
tados extendidos cool a correspon<strong>de</strong>nte bor<strong>da</strong> <strong>de</strong> mobili<strong>da</strong><strong>de</strong>.<br />
FS7/PAINEL I MELD DE SPIN N-vETODIAL CON LIGAQURS ALEAToRIAMEEIR DISTRIBUIDAS - DIACIAMA<br />
DE FASES. Marcelo L. Lyra s B. Coutinto, Department° <strong>de</strong> <strong>Fisica</strong> do WPC<br />
galloon& a ticnica do grupo is reoormsliaaqio no espaqo real as aproximagio <strong>de</strong> coop° Radio<br />
os sum forme epic simples, a qual Noe mostramos car equivalents a sproximagio <strong>de</strong> Bathe-<br />
K olas, nos <strong>de</strong>termioamos es limbos critics' <strong>da</strong>s lases ferro, antiferromagnetics <strong>de</strong> eidra <strong>de</strong><br />
spin pare o modulo ds spins m-vatorlsis cam lipcies aleatoriamante distribuidss, no limits tempara<strong>de</strong>.<br />
segundo use distribuicio qualquer. Os diagrams' ds fames no piano Tip, foram le-<br />
ennead= pars p(41)vp6(.1ii -J1)4(1-p)1(.111 -J2), dm fungi° ds col.11/.12, do aGemo ds coor<strong>de</strong>nagio<br />
▪ a <strong>da</strong> dimensionali<strong>da</strong><strong>de</strong> ■ los spins m-vetorials.<br />
EST/PAINEL 1 PION11110AORS MAGNIITICAS DE =KUM DE /SING EN SLVER-REIMS - vow: Fiaueirsdo<br />
sJoio Antonio "lama - bipartisan° <strong>de</strong> fisica/O1MC Osportamento <strong>de</strong> <strong>Fisica</strong>/MC. '<br />
Consi<strong>de</strong>ramos um me<strong>da</strong>l° simples <strong>de</strong> loins <strong>de</strong> ■pin-1/2 none super-reds consistindo <strong>de</strong> um mei° "sera<br />
ditto& <strong>de</strong> espassnr IL L emm interagas J 1 interealsdo par outro main ds espessur N. tom Later.<br />
qaes J2 . Olfrentes 'rico interim= cos um parimstro <strong>da</strong> troca J a . Esteem' estu<strong>da</strong>odo o diagrams <strong>de</strong><br />
fuss am fungi° do. perimetros ncims mencionados 'upraised° ■ titmice "pro:foods <strong>de</strong> campo media<br />
usual bas coma o grupo ds renursmassqio fenamenolagico proposed par Olgbangals perm o comprimen<br />
to <strong>de</strong> correlasio.
EST/PAINEL Immuos DIPOLARES EM FILMES DE HELM LiQUIDO. Maria Gavotte Co-<br />
valcante. Marcos H. Degani and Oscar Hipolito (Institute <strong>de</strong> <strong>Fisica</strong> a Quimica <strong>de</strong> S.<br />
CiTitr-USP)<br />
Em MINS <strong>de</strong> Mel liquido existe a possibili<strong>da</strong><strong>de</strong> <strong>de</strong> formagio <strong>de</strong> um complex°<br />
ligedo constituido por um on positive no interior do films e um eiStron na superficie<br />
do liquido. Este composto e conhecido com o nose <strong>de</strong> diplon. Neste traba -<br />
rho calculamos a interacio efetiva <strong>de</strong> um dipign consi<strong>de</strong>rando sus interscio cos as<br />
ripplons em funcio <strong>da</strong> espeSsura do filme <strong>de</strong> He liquido.<br />
EST/PAINEL TRANSPORT PRoPEETIEE OF SENICONDUCTOSS PLASMAS UNDER HIGH DC ELECTRIC FIELDS.<br />
V.M. Freire, A.R. Vasconcellos. and R. Lussi, Institute <strong>de</strong> <strong>Fisica</strong>, DIESER - ONICANF.<br />
We consi<strong>de</strong>r the question of how the evolution of the nonequilibrium state of a highly<br />
photoexcited plumes in polar semicondoetorm affects the transport properties of hot carriers un<strong>de</strong>r<br />
high DC electric fields. For that purpose we resort to a nonlinear transport theory for many-body<br />
systems arbitrarily away from equilibrium based an the nonewilibrium statistical operator (NSW<br />
method In Zubereve approach III. re shown the temporal evolution to the stationery state of the<br />
dynamical variable' of Interest end establish a criterion for overshoot to occur.<br />
1. D.E. Zubarev, Nsrevnovesnai ■ Termodinamita Stateenekala (Ind. Hauka. No:0mm. 1970) lengIish<br />
Trani.: Nonequillbrium Statistical Thermodynamics (Consultants Bureau. Nem Toth, IWO.<br />
EST/PAINEL 1 DIAGRAM is FASES DO MODEL° DE ASNICIN-TELLEa NA REDS DE 5E111E. Francisco A. <strong>de</strong><br />
wine. Mei° J. <strong>de</strong> Oliveira a Silvio R.A.Salinsa.(Inetituto <strong>de</strong> Mice <strong>da</strong> Silo Psul<br />
Ap a um prorodisento i ttttt ivo pare Deco<strong>de</strong>r as proprie<strong>da</strong><strong>de</strong>s keels do so<strong>de</strong>lo <strong>de</strong> Ambhin<br />
- Teller. dodo pet° hsoil '<br />
H -J,X.(c„dc, E.g.) - pJ X r.T.S.S. Ands Test e num. Armee <strong>de</strong> Employ <strong>de</strong> evor<strong>de</strong><br />
%%JP % 3 1 7 (killjtj<br />
oleo:. 0problem maims em setu<strong>de</strong>r um mapeamento tridiaensionel as terms dos valorem espere<strong>de</strong>s(4,<br />
(S) a 019 <strong>de</strong>e maims <strong>de</strong> ■pin. No limits <strong>de</strong> coar<strong>de</strong>nscio infinite (qua corresponds a ums aolulb<br />
<strong>de</strong> camp° eddio num ro<strong>de</strong> <strong>de</strong> Bravais) obteess um diagram' <strong>de</strong> raves quo concords tom resulted°. <strong>de</strong> Ii<br />
pare iao. p)0. Para prO, no entente, <strong>de</strong> ttttt mos a exiatincia <strong>de</strong> uma nova fem. qua d este<br />
eel nom pequene reel° do plena T-p. 0 diagrams <strong>de</strong> fuses d completemeete <strong>de</strong>termined° strove@ <strong>de</strong> u<br />
me =lilies. dm °sere* !lure as ro<strong>de</strong> <strong>de</strong> Bathe. No memento seem= este<strong>da</strong>ndo o efeito <strong>de</strong> re<strong>de</strong>s tom<br />
coor<strong>de</strong>netRe ■ Naito, e do p so <strong>de</strong> temps ■seimetvicoe no hemiltomiano
EST/PNINEL 1 DESIDUR71 IT INDUZIDA FOE PAREDES DE DONISIO NO NODELO IT TOTALIENTE FROSTRADO.<br />
memo Craxato. OCT/Institute <strong>de</strong> Pesquisms Empaciais - INNS, CP: 515, 12201 - Rio Jomi dos Campos,<br />
SP, Spoil.<br />
Apresents-se.uma di dm trod:sick <strong>de</strong> fame adle<strong>da</strong> par <strong>de</strong>feitos no mo<strong>de</strong>lo IY<br />
totalmsnte frustreds. 0 grope do remormalisscio dm Kil<strong>da</strong>' -Eadsnoff a empregado pars investlgsr<br />
comportmosnto critic::: <strong>de</strong> um mo<strong>de</strong>l:, similar quo se es:contra na mesas clams, dm oniversali<strong>da</strong>ds<br />
quo o mm<strong>de</strong>lo IT [rostra*. 0 diagrams <strong>de</strong> Ease resultants momtra quo ■ or<strong>de</strong>m do tips IT nio pods<br />
coexist's cam <strong>de</strong>mor<strong>de</strong>m do tips !ming. Seto canards com o conirie <strong>da</strong> transicio <strong>de</strong> fess no pods-<br />
lo IT frustrado sugerido recentements.<br />
EST/PAINEL NODELO BBC CON ARIBOTROP1A ALEATORIA. Vera B. Neer' , Institute <strong>de</strong> Fimics.<br />
USP, Carlos g.1.0 ' . Immature dm 'stodge Avange<strong>de</strong>s, CTA e Silvio R.A Ealinas, Institute <strong>de</strong><br />
<strong>Fisica</strong>. USP.<br />
0 mo<strong>de</strong>lo <strong>de</strong> Blume-Cape( (mo<strong>de</strong>led SEC cam comficiente nolo pars o torso biquadritico) opts -<br />
ants um diagram <strong>de</strong> loses semelbmnte so <strong>de</strong> um sista= metsmagatleo. No plow D/J n k 'f/J on<strong>de</strong><br />
J s D ego Om coeficientes dos terms <strong>de</strong> troc o <strong>de</strong> mulsotropia, rempectivamente, e T 4 tempers<br />
tura, hd ums links <strong>de</strong> coexistlecia qua tmaina sum ponto.trknitia , prolengando -se comm ens linha<br />
<strong>de</strong> pontos critices. Este em estudo o efeito <strong>da</strong> ■ leatorie<strong>da</strong><strong>de</strong> no term D sabre ss es aaaaa ristiess<br />
do diagram <strong>de</strong> Eases <strong>de</strong>uce mo<strong>de</strong>l°. Resulta<strong>de</strong>s <strong>de</strong> camp medico estio son<strong>de</strong> abtidos ems ums tecnica<br />
<strong>de</strong>mo:moll:ids per van (lessen. 0 efelto dos fluteegees sere emtu<strong>da</strong>do ■ es <strong>de</strong> tecnicms <strong>de</strong> grope<br />
dm renoralisaglo.<br />
1EST/PAINEL I " ESTUDOS DE GRUPO DE RENORNALIZACZO APL1CAE0S A BISTENAS Apsoannos "<br />
N.S.O. Nassonama; Institute dm Elsie. dm UPIJ s E.V.L. <strong>de</strong> Mello; Departmmento <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> qr.<br />
Noliculaa <strong>de</strong> Deutirie edoorvi<strong>da</strong>s em sub-monocama<strong>da</strong> ■ em Grafite, pods. nor <strong>de</strong>scritas polo<br />
Mo<strong>de</strong>l° ds Cis <strong>de</strong> Reds em um. reds triangular coo i go-'s repulsive@ entre prissiros visl -<br />
nhos o atr aa i aaa entre visinhos superior's. Tat situagio pods ear representa<strong>da</strong> pot um Haseltunia -<br />
no quo pertence a mesa classe dm univsreslIdia<strong>de</strong> do No<strong>da</strong>l° <strong>de</strong> Potts do 3 -estados._Fimsmos um tro-<br />
ts:onto <strong>de</strong> Grupo <strong>de</strong> Renoralisagio no espago <strong>da</strong>m posigoes utilisando as apronimagoes iterations<br />
<strong>de</strong> Nig<strong>da</strong>l-Ea<strong>da</strong>noff as ro<strong>de</strong> trisniular e analisamos o diagrams global <strong>de</strong> lass no aspago dos pari -<br />
metros <strong>da</strong> interagio entre as molecules do adsorvato o do potencial quimlco. 0 di. rams dv rasp.<br />
<strong>de</strong>nsi<strong>da</strong>do Id temp obtido fol coop:redo coo resultado ■ esparimentais. Pu<strong>de</strong>mo ■ observer qua<br />
o cooportamento previmto esti on grand. acordo coo os rssultadoo obtidos experimatalments.<br />
.11=1<br />
1
▪<br />
■■ ■ ■<br />
EST/PAINEL ANTIFERRONAIINETO EN CAMPO UNIFORM CON 011.0100'100B<br />
8.11. <strong>de</strong> Oliveira. P.R. <strong>de</strong> Oliveirm n M.A. Continentlfii4UFF1<br />
I @shelled' s 0114114.o par shies no modulo <strong>de</strong> idle, antiferre:<br />
aagnitice Owls quedra<strong>da</strong>/ ea es camps uniform, at do Orepo Is No.: -<br />
licac6 es heap Real. A salute utilised. i matodual -a preserve<br />
sinetri ■ <strong>de</strong> ■ ■ubre<strong>de</strong>s. Cape no came do problems see dileicle ace-<br />
plan/Rio ADM 0 MMIDO i propercionel AO namero <strong>de</strong> coar<strong>de</strong>naq;41 do ■itie<br />
4Relemo<strong>de</strong> R. <strong>de</strong>s Santos, 3.Phys.CIS 4198511. Apreaeate-se a diagram'<br />
<strong>de</strong> ease abtido no game PeleH ands P i it concentralL, T a tseparats-<br />
ra a H o camps aplicado. Deseieees camerae as reseita<strong>de</strong>m obli<strong>de</strong>s tam<br />
lie <strong>de</strong> R.R. <strong>de</strong>s<br />
Santos.. dmOueiree.que vie.trebalheedo Dwane°.<br />
problem ■ cos dileicie per liseq6s..<br />
FST/PAINEL 1 cmgoimapill pANCIAL NO NOBEL° BEG. Roberto.Oadrie (Dpartamento <strong>de</strong><br />
Plaice, Uu6, Brasilia). Nisi° J.<strong>de</strong> Oliveira SLIvio-1.8elinaa (Institute <strong>de</strong> <strong>Fisica</strong><br />
<strong>de</strong> US?. Si* Paulo).<br />
0 mo<strong>de</strong>lo <strong>de</strong> Blume, Emery Griffiths (BBC) so apago'par. d. <strong>da</strong><strong>da</strong> polo ipmilto<br />
n iaso a A t<br />
pc.. -.5 i S .S - I i 8.S, v D i S -<br />
i°<br />
(i i) i ( n A 4<br />
. . .<br />
.<br />
ends Si . .1, 0, -I per ■ quelquer eitio i <strong>de</strong> uses reds mastaling. Ni rga° es que<br />
E/J 4. 1 4 DieJ c 0, pu<strong>de</strong> a i e coor<strong>de</strong>nagio <strong>de</strong> reds, o san<strong>de</strong> fun<strong>da</strong>mental <strong>de</strong>et bemilconiano<br />
apr eeeeee uses ease pout° diecuti<strong>da</strong> as liter aaaaa , casactariaa<strong>da</strong> par as<br />
ord to quadripoler <strong>de</strong> eubre<strong>de</strong>, cos magnatimegio.locat nuts. Otiliaamoe uses it<br />
wore <strong>de</strong> Cayley, no limits <strong>de</strong> coordnacio infinite, perm formulas ■ ueol - <strong>de</strong> cmi<br />
po midi(' do ■o<strong>de</strong>lo BIC coma um problems <strong>de</strong> mapeemento. Ums.enilias doerlimitee ad<br />
e stabili<strong>da</strong><strong>de</strong> dos ponto ■ fixes, complementado pale salted° <strong>de</strong>o -Anergice. -livrem -cosrespon<strong>de</strong>nt's,<br />
f eeeeee um image. do diagrams<br />
-<br />
global. <strong>de</strong> fele@ Aosta' eietemn. _Esti<br />
is aa<strong>da</strong>mento um escudo do problems p<br />
<strong>de</strong> Cayley com-coor<strong>de</strong>necie finite.<br />
EST/PAINEL IESTRUTORAS COmENMAAVEIS LISCOMENSURAVEIS CAOTICAS . DS -UX:MAPEAmEN<br />
TO B1D1NENSIONAL. Americo T.Bernar<strong>de</strong>S Clario J.. <strong>de</strong> Oliveira. Institute <strong>de</strong> <strong>Fisica</strong><br />
- OSP.<br />
Analisamos numericomente o mapeamento.bidimensional 0 0' a K' <strong>de</strong>finido<br />
por:<br />
tend'<br />
mseni0 + 6)<br />
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/ 1 114.70<br />
e M' --ropwr-<br />
on<strong>de</strong> r + to 2hMcosi0+610<br />
<strong>de</strong>scrito pelos paametros hb0.6 e T. 0 mapeamento po<strong>de</strong> sec interpretado comp a so<br />
lucAo na drvore <strong>de</strong> Cayley <strong>de</strong> coor<strong>de</strong>na0o. infinite do mo<strong>de</strong>lo-xy quiral na presence<strong>de</strong><br />
um campo. 0 diagram& <strong>de</strong> fames h6T apresenta regifies correspon<strong>de</strong>ntes a estruturas<br />
comensurAveia. incomenaurfiveis e caciticas.<br />
aPe '
BT/PAINEL MODELO DE ISING DE SPIN S ■1 CON INTERAgOst COMPETITIVAS NA REDE<br />
DE BETHE. Crisagono R. <strong>da</strong> Silva (Departamento <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> OPAL) a Sergio G. Cou -<br />
tinho (Departamento <strong>de</strong> Ficice dm UFPE).<br />
0 diagrama <strong>de</strong> Eases a as proprie<strong>da</strong><strong>de</strong>s locals do mo<strong>de</strong>lo <strong>de</strong>jsing <strong>de</strong> spin Sol<br />
na reds <strong>de</strong> Bathe corn auger° <strong>de</strong> coor<strong>de</strong>nacio arbitrSrio foram estu<strong>da</strong><strong>da</strong>s consi<strong>de</strong>rando-se<br />
interapies entre primeiros a segundos vizinhos male pr6sisos. snisotroPis<br />
um camp* magnitico extern. A introducio do parimetro animotropico Indus o spare -<br />
cimento <strong>de</strong> novas fames alem <strong>da</strong>s fames ferro, paramagnatica modula<strong>da</strong>s presents'<br />
no mo<strong>de</strong>lo coo spin 1/2 ca. Alen disso, obeervamos urns consi<strong>de</strong>rivel diminuicio<br />
dos efeitos <strong>de</strong> frustragao caracteristicos <strong>da</strong> Ease modula<strong>da</strong>. A funcio <strong>de</strong> partici°,<br />
a magnetisagio local e s fungi* <strong>de</strong> correlacio local entre pares <strong>de</strong> spins visinhos<br />
mails proximos, sio calcula<strong>da</strong>s exatamente em fungi* dos pontos fixos <strong>de</strong> cdnvergincia<br />
<strong>da</strong>s relacoes <strong>de</strong> recorronclas dos campos efetivos <strong>de</strong>finidos apropria<strong>da</strong>mente.<br />
Cl] J. Vannimenus, E. Phys. 843, 141, (1981).<br />
EST/PRINEL11 -17-3 DELoceunAt — PARA HICROEMOIJORS. JUr en F.Stilek.Iestituto di <strong>Fisica</strong> as USP.<br />
0 mo<strong>de</strong>lo calular,gfre eiernaulaae ■ (Inas biome nuas se adstures <strong>de</strong> Sgt.. dlso s <strong>de</strong>tergen<br />
te)Prol000to per wheeler"' 0 cousi<strong>de</strong>rivelmeoce sioplificido quaodo o <strong>de</strong>tsrasnts I confined* na interface<br />
dgua-oloo.Peste limits.obtemos um modulo <strong>de</strong> loin corn intarsga ■ <strong>de</strong> priesiros visiohos.segusdos<br />
vizi:dm tome do cram spina<br />
R<br />
-J1 ( j) 8 8 -<br />
( .1 (i j<br />
E k) (J 2i S s J 3 5.11.6 ) - h E Si 21 ends a soma g 'd sabre to<br />
1.1 s' ( ij k)<br />
don os coujuutos <strong>de</strong> tram itios na rem quo forme um Angulo rate, <strong>de</strong> tel forms qua on @Mos dos<br />
extrem ■ se jam segundos rieinhoelaidoe Ancereassaissapes m leo Mee U este pay micersoralaes.No cm<br />
so .13.1). este modstio foi has ttttt ostu<strong>da</strong>do na reds quadrads .6stames ata<strong>da</strong>nto a bus 81011100 na<br />
ro<strong>de</strong> <strong>de</strong> asth.obtando diagram's <strong>de</strong> Lases semaisacce eon do modulo AM 14- ,on<strong>de</strong> es Meee moduladse<br />
corraepon<strong>de</strong>m A microomulsio.<br />
Ref.:<br />
(I) J.C.Whealer, comusicatau particular (65)<br />
(2) 1.1fidoo. preprint Corneal (65)<br />
(3) K.N.larber. J.Phya. A: Nath.0au.12, 679 (79)<br />
(4) C.11.0.9ohoi, M.D.Couriaho rilho R.B.Salisms, Phys.Res. all, 4047 (al)<br />
EST/PAINEL OPCRADOW DC IMERCAN1110 PARA SPINS SCAMS ORDERS.<br />
Joiner Barrett* &etas Fitho (Dgpartamento.ds <strong>Fisica</strong> do UniVeridi<strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Alagoas).<br />
Imbed& do empirito do present* congress', iota comunico(fii refiete Naito alis umo divi<strong>de</strong> gime ms<br />
oaminho. Schredinger, aw 194J, sseucka o °mad:Pr do intercambio pars spina di alters oraline.Broarn.<br />
cm JOS, apresentom is mitodo algarioo especialmante simples papa emplicimr o operador <strong>de</strong> inter<br />
cambia pare particulas <strong>de</strong> quelquer spin. Fara spin mei°, a relop2o particularmente simples esti;<br />
o operador <strong>de</strong> intercalsbio P, , s 0 produto esvalar (S 1.14) permits, atratas <strong>de</strong>l representagio cons<br />
titui<strong>da</strong> Was marina do e os epinores "mp" e "globe ,um tratamsmto &rota. Para spins 5<br />
algae or<strong>de</strong>rs fepine maioree epee solo), a rolapao d main comptiaa<strong>da</strong>.<br />
Parma:to-se, porn <strong>de</strong>m cash maim as poseibiLi<strong>da</strong><strong>de</strong>s uma rcpresentagio (dogma& vid<br />
vet.
EST/PAINEL<br />
A ECM MT=er1 Leonardo Gregtor libranst, *Jane 11, 21airraLra e<br />
Jcae Ackert° Eglestas"-, Tar's<br />
A Mot) lattice like webs is studied thrcugh a Clean anctico earthed. Ihe timothy<br />
of states of this system is cbtained solving exactly <strong>da</strong> Steen functicn for boo<br />
hybridized atonic Imola, tne of them with coulcabian =patellar, and onixrequatily.A<br />
hopping is intro:lured using Lgscm's equaticn. Tor the moment all amputations anis<br />
ba<strong>de</strong> at zero Wiper:mute.<br />
EST/PANEL<br />
MODELO 8(6)i M2TODO D8 CORTE-COLAPSO 8 DIAGRAMA DE PAM Ananias<br />
Monteiro Maris +, mine Cristins Navarro <strong>de</strong> Mamalhied, Luciano Rodrigues <strong>da</strong><br />
Silva 4, a Constantino Tsallis (+ Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Rio Gran<strong>de</strong> do Norte,<br />
',Centro Brasileiro <strong>de</strong> Pesquisas Flatcars).<br />
Esten<strong>de</strong>mos pars o mo<strong>de</strong>ls S (6) o matodo <strong>de</strong> Corte-COlapso <strong>de</strong>senvolvido inicialmente<br />
pare o mo<strong>de</strong>l° <strong>de</strong> Potts a generalizado pars ontros sistemas, tans come os mo<strong>de</strong>les<br />
5(4) e 2 (5). Este mated° permits a reelizacao <strong>de</strong> tracos parclais em qualmquer<br />
grafts <strong>de</strong> dots terminals sem o exams <strong>de</strong> configuraqies. Mediante.a aplicacao<br />
<strong>de</strong>ste algoritmo ohtemos, atravas <strong>da</strong> tacnica do grupo do.renormalizacio no espago<br />
real, o diagrams <strong>de</strong> face do mo<strong>de</strong>lo 5 (6)ferromagnatico na ro<strong>de</strong> quadra<strong>da</strong>.<br />
E5T/PAIMEL77 INFINITOS OPERADORES PRIMARIOS Em CADMUS COM DEFEITOS - J.R.<br />
Drugowich <strong>de</strong> Felicia IFQSC/USP<br />
Estu<strong>da</strong> -se o eseectro <strong>de</strong> ca<strong>de</strong>ias quanticas com <strong>de</strong>feltos com o objetivo <strong>de</strong> encon -<br />
trar as dimensoes animates doi °para<strong>de</strong>rs§ primaries <strong>da</strong> taoria.
INSTRUMETACAO<br />
Cooid.:- Jorge Humberto Nicole (UNICAMP)
INS/11:20/AA.F 1 TRIODO OS CORONA CON COMMENTS CONSTANTS. USWID DOS raticirm 1ISULTADOS.<br />
Jon; A..Eiglocati. Institut. <strong>de</strong> Flats quimica <strong>da</strong> lie Caries.<br />
0 triodo <strong>de</strong> corona i us limits lum . vem "so<strong>da</strong> utilisa<strong>da</strong> p.m e eased* dm proprie<strong>de</strong><strong>de</strong>r <strong>de</strong><br />
tramports smatenanento <strong>de</strong> Tarim el so films Lima <strong>de</strong> pelionme. A ticSica coosiste ee<br />
is dspeatfir as mama. <strong>de</strong> ma grads sotilla, os ions pv*111;8180, por una donorsa corona<br />
mdir simatamanonte o potential do soperficie torrents <strong>de</strong> cares do masers donate e spiv o<br />
protease do <strong>de</strong>posigio dos loos. Alit diet° ■ s comsat@ <strong>de</strong> emse do sonars pu<strong>de</strong> see mati<strong>de</strong> commie<br />
Le. MOW trebeitio i feito um scrota dos principals regatta°. Ma esti° obti<strong>de</strong>s. nvelves<strong>de</strong> Os sovista'<br />
aspct°, do : controls dm <strong>de</strong> carp. usifernids<strong>de</strong> <strong>da</strong> Mosaic:4 dos Ions se-<br />
bre a somme ruldos nom manes. Tsai. Rio discuti<strong>de</strong>o os modles tarloos p as ems option:es<br />
am intrprotcao dos resultados esperimesta obtidos em aliments' pelimeros.<br />
INS/8240/4A.F ITeCNICAS OE nICROSCOPIA ELETRONICA OE VARREOURA PARA AVALIACAO OE<br />
CIRCUITOS INTEORAOOS. A.C.S.Ranos. C.A.Ribeiro -(Laboratirio do Pesquiss so Dispo<br />
e itivos - IFGW - Unice:ph<br />
O to mango no tecnologia do Tabrioagia dm circuito ■ integrados do alto<br />
donsi<strong>da</strong>ds. quo vise numento do Rumor° <strong>de</strong> finical's sm um mend 'Chip'. acarrstou<br />
a !<strong>da</strong>me <strong>de</strong> ostudos mole dotalhadoe Babe' ■ a confiebili<strong>de</strong>d ■ dsts dimpositivon.<br />
o qu ■ Imou par sus van so d Ivisento do mitedos min sofiettcados pore<br />
a evollagio e cormterizegio dos dispositivos.<br />
Estonia dosenvolvendo presentomento. pare oplicapio ois noeso Isicrosciplo ale<br />
trenico <strong>de</strong> vorrodura. um aitodo pars obtoncia do imams do to induzi<strong>da</strong> par<br />
Tam letranico (MC). quo permits caracterizer as (urman" metes diepositivos<br />
juntenente tom mitres medi<strong>de</strong>a tosbom obti<strong>da</strong>s so micromipla ■.g. contrasts <strong>de</strong><br />
voltage's. permitem obter um avollageo do dispositiva.<br />
IFAPESPI TELEDRAS S.A.)<br />
INs/9.00,4A.F I Minch pa ono* os moms muds es Esiscpumnru rare-a08'ric.4. .<br />
joie Carlos Masai. Valentin Obit Rod. a Nichol A. <strong>da</strong>gerter. Institut° <strong>de</strong> !tam e Wats<br />
<strong>de</strong> Sao Carlos. Universi<strong>da</strong><strong>de</strong> do Sip Paulo.<br />
A t cc ica <strong>de</strong> espectreseopia Moto-ecistim. esti bisma<strong>da</strong> as gmecie do mass sciatica&<br />
par no material <strong>de</strong>vido a absorcio do mosso. Sete efeito se di donne ao gradients <strong>de</strong> temps<br />
ratura formado a p.rtir do um mato ends incid um (sine <strong>de</strong> Ins. quo pram mu<strong>da</strong>nca on <strong>de</strong>n<br />
si<strong>de</strong>d' do ar quo circun<strong>da</strong>. A ands ma<strong>da</strong> pad. ear d o<strong>da</strong>. Enplificads. foromera in<br />
formasies sobro a 'Marc's.° Emits local.<br />
Este efeito nos lagers. entio, a possibili<strong>da</strong><strong>de</strong> <strong>de</strong> no nspeamoto <strong>de</strong> qualquer superfi -<br />
tie valid.. meditate a equisicio <strong>de</strong> anal' ametwitice so Longo <strong>de</strong> memo.<br />
Para seta fieslids<strong>de</strong> 5.11 ..ado implementado no oistesa capita <strong>de</strong> <strong>de</strong>fletir numerics:an<br />
to no faze colimsdo do LASER sobre um <strong>de</strong>termins<strong>da</strong> moats' socerra<strong>da</strong> no interior <strong>de</strong> vow<br />
cimara <strong>de</strong> efeito iota-aciatico. A <strong>de</strong>flesio do false i mompaubs<strong>da</strong> poeto a mato pals <strong>de</strong>ter<br />
qio par amplilicacio sincrons dos sings acusto-siticom, qua postariorseats sac 4iiitaliaa=<br />
dos .<br />
On computodor cempativel ao ION PC i utilldo pare fixer o control, do equipment"<br />
a aquisicao <strong>de</strong> dodos. Um sof ccccc apecifico las o processamento dos ■inais germ um<br />
tets represeatatim <strong>da</strong> absorgia Falco medians stribulcio do olvels <strong>de</strong> tins' a co<strong>da</strong> ■inal.
INS/9:20/aAF I SISTEMA PARA DEPOSICAO DE FILMSS FINOS DE POLIMEAOS ORCAMICOS PRODUZ1DOS ES<br />
PLASMAS - RP. Romero Booties° Mattel. Jsyr <strong>de</strong> Mori. Fllbo, Roberto Antonio Stspniab, Carlo. Via<br />
no Speller (Departanento <strong>de</strong> <strong>Fisica</strong> do ITA, ETA, Sao Josi dos Campo. ■ SP) Mario Antonio Bic. <strong>de</strong><br />
Morass (ITEM - UN1CAMP. Campion,. S1).<br />
As (.tic's <strong>de</strong> um sista= par. a produgio a escudo <strong>de</strong> 'Damara' orsjoieon st aaa a <strong>da</strong><br />
plasm produsido por d sm. RP in atmosferas composts. <strong>de</strong> Ed <strong>de</strong> =Dish°, orainicom. 0:0<br />
ap <strong>de</strong>s. Pretends-se obter fames flocs d materials, coo Utica Optics.. Saw<br />
<strong>da</strong>r-se-i. rambio. a tofluincia <strong>da</strong>m ',maelstrom <strong>da</strong> d go sabre as suss propris<strong>da</strong>ds. ben comp; a<br />
aoilis mats <strong>de</strong>tmlbs<strong>da</strong> <strong>da</strong> composigio . dm fleico-quinica envolvi<strong>da</strong>, particulsrmente na resat) MI<br />
in pissaa-supdrEici., at aaaa a <strong>de</strong> limit.. <strong>de</strong> spectronstria optics e <strong>de</strong> sass's. (FINEP).<br />
1115/9:40/11A.F I EFICIANC1A WANT= DOS CUTELY/ORES Nalea . Nelson Joai &veld° Gallo; Jodi<br />
Pedro Amdreota . Institut° <strong>de</strong> Pimlico guimiem <strong>de</strong> Sio Carlos. Universidm<strong>de</strong> dm<br />
Sio Paulo Robert Lem Simmers . Contra <strong>de</strong> lostrumeutagmo. Dosimetela s Radloprotetio. Solver<br />
si<strong>da</strong><strong>da</strong> <strong>de</strong> lie Paulo.<br />
Canute <strong>de</strong> Nal doped°. coo Tilio acopladom os fotomultiplicadores sio oa main aproveitados<br />
dilator.. do radiatio eletromminitica <strong>de</strong> enersls superior <strong>de</strong> 30 keT. A ilea <strong>de</strong>nsi<strong>da</strong><strong>de</strong> slstrooi -<br />
ca proportions uv alt. probabili<strong>da</strong>ds ■ polo. fait°s fotolitrico Coupton, du produtio <strong>de</strong> um ell<br />
iron ripido perm cads sato sand inci<strong>de</strong>nts. 0 pequsoo al <strong>de</strong>nte elitron asssurs quo a metal;<br />
do rain gams neje tocalmente aaaaa !arma<strong>da</strong> es pores <strong>de</strong> (ono. A forincla <strong>de</strong>sta 'marsh links<br />
pare as control' 'liven results so on miner° <strong>de</strong> talons proporcionsl onersim do rah gams. Quays<br />
in<strong>de</strong>pen<strong>de</strong>nts do tamanho do crimtal, contributes' ■ purses do c aaaaa 1, a otimitagio <strong>da</strong> clops's", a<br />
refltivi<strong>de</strong><strong>de</strong> do ncapsulagio a o acoplanento Otte° a vilvol ■ fotounlriplicadora pare a uslhorpom<br />
sive' converio linear <strong>da</strong> enersia do raio gem nun niuero <strong>de</strong> fotuelitrons disponivel pare a subs_<br />
queer. anplificario a anillne. No IFOSC-USP Gristais chindrleos <strong>de</strong> Sal dopodos eon 12 Tilio rota<br />
ben um polimento e socapsulassoto hermitic° con use (ace acopla<strong>da</strong> <strong>de</strong> um" jaolm dm quarts° camera<br />
xa <strong>de</strong> 'intone s as sutras feces cabin-las <strong>de</strong> Oaldo <strong>da</strong> !swish. No ODRA -USP corectstiasso, on<br />
chtihdores " <strong>de</strong> medi<strong>da</strong>s dm altars distrhuteas dos pulses alma:<strong>de</strong>o' qua resulten do<br />
rotas gauss <strong>de</strong> Ce131 cam inertia <strong>de</strong> 663 keV. A Immure <strong>de</strong> distrIbuicio dos pulses revels o miner°<br />
<strong>de</strong> Potoi:trans/lief produsido pals radiagio gams, late i. a prOpria na aaaaa quantal dm Iva pro -<br />
dusi<strong>da</strong> oo chtllador. Nossos crletals <strong>de</strong> MI Ovid/smut mocapsulados e dopados cos Tato <strong>de</strong>mons -<br />
tram um" co 'panties comparivel cos on forneci<strong>da</strong> ■ no exterior. (CAM.<br />
INS/10:15/4A.F AIPROODICIA EMEROETICA 1Z MESMER INSTRUMENTOS DEMETORES DA NADIATiS SETA.<br />
Marla <strong>de</strong> Penh. P. Albuquerque, Marcos Xavier Lin<strong>da</strong> T.E. Cold.. (lnerltuto <strong>de</strong><br />
Peequises Enereiticas ■ NUCIORTOO (:PEN). Comissio <strong>Nacional</strong> <strong>de</strong> Entrain moclell<br />
Sio Paulo).<br />
0 missing padr'io eecundirio <strong>de</strong> cadiavia bred doe laborat5ricm do Falihracio do 11,11, do quit<br />
fmseu pieta Fontes calibtadms <strong>de</strong> 91111,N IT (50 e 2 uC(), 20vTI (2 wei) 112 Po (14 ma), Vol ati<br />
ami<strong>de</strong> pats a <strong>de</strong>rerminc6 dm d <strong>de</strong>encie enerpitics dos principals lostruventos monitores <strong>da</strong> re<br />
diagAo. Form. eptu<strong>de</strong>doe op wpnrolb " 1 ■ do /ion (vivre - 011111.0, enemas do innizicito sli m<br />
dricas, <strong>de</strong>simetros <strong>de</strong> holso e slaloms sonoros, again comp as samaras <strong>de</strong> ioninac:o <strong>de</strong> Oath pare<br />
isle.. as resultadoe Meow compared°. cam as obtidom tom a roars dm extrapolaeio, qua i o ■totems<br />
<strong>de</strong> reterioci ■ pars <strong>de</strong>teccio <strong>da</strong> radiscio beta. con doelmetros termoluni
1115/10:35/4A.F1<br />
DESENVOLVINENTO DE UM SISTEMA PARA NEDIDA DA DIFUSIVfbADE<br />
CA ATRAVgS DO NgTODO DAS TENPERATURAS PERIODICAS - Victor Bertucci<br />
Neto. Darn° B.G. Assis e Benhard J. Nokross - IBTC-31—F11-17U<br />
r(In--mace <strong>de</strong> Sao Carlos - USP.<br />
Dentre as vistas tecnicas utiliza<strong>de</strong>s pare medirLse a difusivi<strong>da</strong><strong>de</strong> tirmica<br />
em certos tipos <strong>de</strong> materials, o mitodo <strong>de</strong>s temperatures peri6dices i um dos<br />
quo apresente msiores precisies e vantagens. Cols come: reducio do efeito <strong>de</strong><br />
per<strong>da</strong>s por rediscio, utilizasio <strong>de</strong> amostras em temenhos reduzidos, rapi<strong>de</strong>z <strong>de</strong><br />
leitura e uma rezoivel Tellies° sinel-ruido.<br />
Em nosso trabalho. particularmente, optamos por esse mikado pare <strong>de</strong>terminaafi°<br />
<strong>de</strong>s caracteristicas termites <strong>de</strong> ligas Sni<strong>de</strong>-Get-mini°.<br />
Apresentaremos um estudo initial comparando dois sistemas provenientbs<br />
do mitodo <strong>de</strong> Angstrom modificedo on<strong>de</strong> Sera proposta uma substitulgio no aquacedor<br />
senoi<strong>de</strong>l.(FAPESP).<br />
1NS/10:55/4A.FI SEMMES Dl TEMPER/JURA POR FISILAS MICAS UTILIEANDO FILMES Dl<br />
SILICIO HIDROGENADO AMORPOS<br />
Edmundo A. S Luis Carlos C. Valauts<br />
bapta. sug.relscomuuteagoss - OFF<br />
Nos ;trines arms ■ virio ■ trpos dile:sots. do termOmeere ■ atilisando fibres Selena<br />
✓em si<strong>de</strong> relocates +aniseed° um* grape. varie<strong>da</strong><strong>de</strong> do materiels sea 00000 ,t:eatcas<br />
<strong>de</strong> <strong>da</strong>tacyao, raise <strong>de</strong> trabelbo e evanesce.<br />
Sutra os Tiverton titles, 'tousles qua s boseiam no oaring:* <strong>da</strong> inteasi<strong>da</strong><strong>de</strong> <strong>da</strong> lus<br />
sae oa mats simples. Nests eomunieagae, dsgerevelegs um term:metro projetado pars<br />
Nadir a temperature <strong>de</strong> transforeadoess (20 - 200 C) utilised°a Co pistons <strong>de</strong><br />
distribute:6 <strong>de</strong> potions <strong>de</strong> ci<strong>da</strong><strong>da</strong> do Rio <strong>de</strong> Janeiro.<br />
O termissero utilise dues fibres <strong>da</strong> Indies <strong>de</strong>gree (200 nee <strong>de</strong> dtimetro) um LED<br />
<strong>de</strong> GaAs mo<strong>de</strong>lled° em Ilene como fonts <strong>de</strong> los. 0 materiel sensor <strong>de</strong> temperature g um<br />
Ultra <strong>de</strong> absorgio :tics counseled: <strong>de</strong> um films <strong>de</strong> sitfcio bidrognado amorfo <strong>de</strong><br />
posited° sabre um vi<strong>de</strong>o <strong>de</strong> SiO 2 . Is uma <strong>de</strong>s faces vi<strong>de</strong>o E recoberto con time Ca-<br />
na<strong>da</strong> ■atirefletor ■ <strong>de</strong> Redo masimisae s los trams minds. Na oilers face.<strong>de</strong>positase<br />
ums csma<strong>da</strong> refiner'. lus p teats <strong>de</strong> uma fibre i refleci<strong>da</strong> pare a mare<br />
peasando dues vases polo files A- Si- H. A lus mdids por as d<br />
FIN compsrad com um sisal <strong>de</strong> ref - is.<br />
Uma vas qua "gap" do sartorial qua forms a films pods mar mu<strong>da</strong>do pets tes<br />
ea <strong>de</strong> bidrogioio e a inellnagao do limier <strong>de</strong> ebsorvie pets espeasure do film* .<br />
discutimos ■ possibili<strong>de</strong>d <strong>da</strong> obese ales sensibili<strong>da</strong>d em friss. senores limea<strong>de</strong><br />
owe tone - tea. O_Iimita tirico <strong>de</strong> sensibili<strong>da</strong>d sonieado algae°<br />
resulemdos experiments', sap spr aaaaa ados.<br />
INS/11;15/4A.F1 DISPOSITIVO PARA REFRIGERAGA0 TERNOBLETRICA - Luis V.A. Scaly'.<br />
- Odilio B.G. Assis e Bernhard J. Nokross - Instituto <strong>de</strong> Fence e<br />
Quimica <strong>de</strong> Sao Carlos - U.S.F.<br />
0 dispositivo em.<strong>de</strong>senvolvimento funcloos cos base no Efeito Peltier.<br />
A Figure <strong>de</strong> Merit.) (z) caracteriza a eficiincia do termoelemento. Os semicondutores<br />
opresentam es ignores figures <strong>de</strong> mgrito conheci<strong>da</strong>s. cow por exempla. as<br />
ligas (Bi 2Te 3 ) 90 (0 2Te 3 ) 5 0b2Se 3 )5 doped ■ com Sb1 3 (tipo n) e<br />
(Sh 2Te 3 ) 72 (lit 2Te 3) 25 (Sb 2Se 3 )3 dopado cos excesso <strong>de</strong> Te (compensacio) do tipo p .<br />
1<br />
Estes materials sio crescidos n pela ticnica Bridgman vertical. pois o crescimento<br />
dove ser direcionado, <strong>de</strong>ri<strong>de</strong>, a ■nisotropi ■ <strong>de</strong>stes materials com relaeio is propriedo<strong>de</strong>s<br />
termoclitricas. Estamos trabelhondo no <strong>de</strong>senvolvimento <strong>de</strong>stes motel-lois<br />
ben como em equipamentos pars cerecterizacio a medidss <strong>de</strong> proprie<strong>da</strong><strong>de</strong>s termoeletricas.<br />
(FAPESP)
INS/11:35/4R.<br />
PROGRAHADOR E CONTROLADOR DE TEMPERATURA PARA FORNOS RESTSTIVOS CON RESOLOCAO<br />
DE 0.1°C. Cram; Eduardo Col.° Noguoira, Sonia Lieia Baldochi e S era Penha<br />
Harsco. (institute <strong>de</strong> Pesquisas Energetic.. a Nueleere ■ - IPEN/CNIN<br />
Desemolvau -me um siatema d ' do a progremacio a controle <strong>de</strong> temperature parafornosremis<br />
Ulan norm.imente utilised°. um cressimmeto <strong>de</strong> cristais. 0 controls <strong>de</strong> temper aaaaa possui rawlu<br />
gio <strong>de</strong> 0,1°C pare fates <strong>de</strong> 0 ■ 999,9 C. a estabili<strong>da</strong><strong>de</strong> i <strong>de</strong> 0,04 C ■presents "Over Shut" infi<br />
rior a OM pare &tarsus <strong>de</strong> 50i <strong>da</strong> potincia maxima. 0 aistema <strong>de</strong> eontrole beaeia-sera correcio do<br />
■ istema pela aproeimacio por um aistams <strong>de</strong> segued. or<strong>de</strong>m, di.pondo <strong>de</strong> control.. <strong>de</strong> band. propor<br />
atonal, integrador e dirivador.<br />
INS/11:55/0A.F<br />
SISTEMA DE AOU18/00 DE DADO8 POR TANGOS PERtODOS DE TEMPO.<br />
Antonio Augusto Souza Brito - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>da</strong> Paraiba.<br />
Em algumas experienciss fisicae ; neceseirlo a aquisicio <strong>de</strong> dodos por iongOe<br />
perlodos <strong>de</strong> tempo. Para tanto estamos construindo um siatema automatized°<br />
<strong>de</strong> aquisicio <strong>de</strong> dodos compree<strong>de</strong>ndo: sensores (temperatUra, humi<strong>da</strong><strong>de</strong>, pressio<br />
atmosferice, etc...); interface com microproceseador. siatema <strong>de</strong> armazenamento<br />
e transports <strong>de</strong> informegoes.<br />
0 conjunto biaico consists <strong>de</strong>: mieroproceseador Z-80A. porta paralela PPI<br />
8255; c rrrrr sor AID B bits multiplexed° on 8 canals ADC 808; memoria RAM CMOS<br />
<strong>de</strong> 2 K.6116; siatema <strong>de</strong> alimentagio com baterlas Ni-Cd pare alimentegio autSnoma<br />
no traneporte <strong>da</strong> memoria RAM. EPROM 2732A pare armazenamento do programs<br />
reei<strong>de</strong>nte.<br />
Embora o projeto initial eateja voltado pare a aquieicio <strong>de</strong> dodos atmosfericos<br />
ele pollen's air utilized° em outros proem:Ism <strong>de</strong> monitoregio por longos<br />
periodos <strong>de</strong> tempo Idles ou mammas) quendo a repicsec no tempo <strong>de</strong> aquisicao<br />
nio a um fator crucial.
q<br />
INVO: 00/ 5A-F IPROJETO C CONSTRUCAO OE ESPACTROFLUORNETRO COIF issoLum TEMPORAL<br />
Josf IliromiHirsts, Carlos /knot/sil l Carlos 11.Talsts a Aman<strong>da</strong> !Ate. Institute <strong>de</strong><br />
<strong>Fisica</strong> <strong>da</strong> USP. .<br />
II emprego<strong>de</strong> t<strong>de</strong>nieas <strong>de</strong> espe cccccc opia por fl Onei nom rsoluclo tempo<br />
Tel tee contribuldo migniti ' *ante pars comp eeeee 'r<strong>de</strong> processos dinesicos,<br />
ftsieos e quimicos es biologis ■olecular.Do 'entitle do empliaclo dos trebalbos a<br />
qua o Crupo <strong>de</strong> Bieftsica do IFUSP tem se <strong>de</strong>diesdo, projetamos e eetsmos eeeeee elu<strong>de</strong><br />
us "spectrofluerimeiro quo permit' ■ diseriminacRo temporal <strong>de</strong> "yentas qua se<br />
situ's no faille <strong>de</strong> 10 segundo.A eireitagio dm amostra se fns eon usa limped' Dui<br />
sa<strong>da</strong> <strong>de</strong> d eeeee ga em gases e o perfil tomporal <strong>da</strong> emissilo fl 4 obtido<br />
smiled' <strong>da</strong> tfenies <strong>de</strong> eontsgem<strong>de</strong> fdtons e <strong>de</strong>terminsclo <strong>de</strong> tempos <strong>de</strong> corrolacia entre<br />
pulso <strong>de</strong> ■scitecio e a emimello fluorescents.<br />
iNS113:20/511.rl COMSTROCIO OE UM SISTAMA DC 111CROONDA PARA ESPECTROSCOPIA PARAMAC-<br />
FICTICA ELISTROBICA EN BANDA SC1,5 4 4.0 ORO w JOB CAILOS SARTORI,OCTACIRD BAUM<br />
NASCHIENTO, ERSC/IIISC. A convenignela em ma utiliser um espeetrimetro dm SPE em<br />
bands 11 i permitir o 'mead* <strong>de</strong> '.efts' qua apresentam estr rrrrr s paramagnitiea ■<br />
van<strong>da</strong>ls <strong>de</strong>s Iterscies hiperfinas s .11148.111415 parcialments resole/4a". 0 "totem"<br />
am dosenvolvimento basi to i compost* dm um oscilador quo opera's. fair ■ <strong>da</strong><br />
1,0 a 2,0 Cbs, use cavi<strong>da</strong><strong>de</strong> do tipo "LOW CAP" qua .brigs a amodtra ■ ■er anslisa-<br />
<strong>da</strong> ■ acopladoras direcionais. eirculadores, atenuadorne, d , @Jetsam <strong>de</strong> AFC e<br />
pri-amplificador. Todo ■rrauje congas sea pouts <strong>de</strong> microon<strong>da</strong> qns I a<strong>da</strong>pted' ao<br />
le do espectrametro Varism do Laboratirlo do Crupo <strong>de</strong> Bi.ofgrica do MISC. No<br />
f ists.. pressetado os estigios <strong>de</strong> CAP, pri-amplificador a tarids<strong>de</strong> eeeeee sota fo-<br />
ram to<strong>da</strong>y d hi<strong>de</strong>. localmente. Algoma madi<strong>da</strong>" ji foram efotaa<strong>da</strong>s e os resell-<br />
' ado" initial" mostrarameme asimadores. comp do a wiabili<strong>da</strong><strong>de</strong> do ■<strong>da</strong>ptasio.<br />
Use 'tap ■ sir "suici<strong>de</strong> Lied". i melhocar a ralssio sisal-rado do 'totems.<br />
INS/0:40/56.F !SIMKO DE CONTIOLE A mouncio PARA 1CMOI7AF1A POI 2101. emir: Torre Neto. Matey<br />
■ Jose Martin. a H. Pmeepueei (Deportment. <strong>de</strong> <strong>Fisica</strong> e Cana.. doe Motorists, Institute <strong>de</strong><br />
<strong>Fisica</strong> e Cuimics <strong>de</strong> Sio Carlon, USP).<br />
.<br />
Este gismos controls uma esperiesci ■ <strong>de</strong> ERN pulsed. particularmente porn a obtencio <strong>de</strong> Imogene<br />
corn mesa te ee 1 c a. Ti. camp part's fun<strong>da</strong>mentals un module digitlisador <strong>da</strong> ientes e um<br />
CPU Romero. lie i eases dm digitalisr transient's ■ ,IDs ou etas no emu) dm ressonieeis, sae umm<br />
✓esoled° <strong>de</strong> 12 bits (. 244 ppm). Possui dole eansis <strong>de</strong> entra<strong>da</strong> quo registry os <strong>de</strong>nim em 256. 512<br />
ou 1024 pal do memari. 0 interval. entre as digital:sagas@ ("dwell-time") i do no minim 40<br />
uS e no maxim 1 mS. Um retard' <strong>de</strong> ati 16 mS pods ser @jestd° entre o sinsi <strong>de</strong> disparo ("trigger")<br />
o o inicio do digitslisado. Todo eases parimetros pod's mar programsdos pales interfaces parole!<br />
' 1 qua Ease. a feremeis <strong>de</strong> dodos pars CPU nests,. 0 sine." po<strong>de</strong> minds prover ■<br />
promediado (" 4e") dos sisals adquiridos par melhorar a rein*. minal/ruido. Todo pro-<br />
d. equisido e scompanteido mum monitor u-p pars no juate a<strong>de</strong>quado <strong>de</strong> pad:metros. Esse moni-<br />
tor i capes <strong>de</strong> mu eeeee mingle ■lgum processamento local, pel CPU metre, dos <strong>da</strong>d's adquiridos. Ale<br />
tem si<strong>de</strong> utilised' pare me observer a trsoeforme<strong>da</strong> <strong>de</strong> Fourier unidimensional qua graces a on co-<br />
proe eeeeee r aritoitieo i realised. is 2 segundom per' 256 pontos. Na CPU metre emtio ' lidos<br />
con digital/mnsligicos e eansis <strong>de</strong> interrupdo qua controls. a gerado <strong>de</strong> gradient's <strong>de</strong><br />
✓amp*. mamma <strong>da</strong>m rrrrr Leriaricas mama po<strong>de</strong>m mar alter ■<strong>da</strong>s, refsendo-se o software. Por exempla.<br />
o tmanho dos registry pods mar aumentdo pars 2048 pal ou so loves <strong>de</strong> midi' po<strong>de</strong> -se<br />
I<br />
subtrair dole sinaim. 0 miasma permit' nos eerta vermatili<strong>da</strong><strong>de</strong> Wan<strong>da</strong> posies° servir a antrum pro<br />
positos.
if15/9:00/5A.F CAMARA FOTOTARMICA MITA PARA MIDAS "IN-VIVO". Mauro Henrique <strong>de</strong> Panls(Ali-<br />
RRAPA-UAPDIA)R Apareci<strong>de</strong>A.Carvalini(Fscul<strong>da</strong>ds <strong>de</strong> Engenharla - Campus <strong>de</strong> Ill. Soltaira-UNESP). Lu-<br />
cas M. Alves a Michel A. A (Institute <strong>de</strong> Fimica Qu(mice <strong>de</strong> Sio Carlos-USP).<br />
Oesenvolvemos um rimers fototArmica aberta particulamente a<strong>de</strong>qua<strong>da</strong> pan ma<strong>da</strong>m eapectroscApi-<br />
cas "in-vivo". 0 element° chairs i um dutor plem-pireelitrico transparent' tal COMO UM [Cie<br />
COI <strong>de</strong> LIMbO. ou quarto° cristalimo. Com a nova cisme. qua pods ser megalith' a um ca1mAtIco,ob<br />
tivems 'spectres "In-vivo" 0 "in-vitro" <strong>de</strong> follies <strong>de</strong> ("1101Yeedium Adiantum") m reglio <strong>de</strong><br />
400 800m, qua comprisn<strong>de</strong> ■ bands <strong>de</strong> clorofilm. A impost ■ do dutor i linear a proper-<br />
clone] a manila do /else <strong>de</strong> 10: em polo acne 3 or<strong>de</strong>al', <strong>de</strong> g aaaaaaa . UtIllsando o Nlebeto <strong>de</strong> Li<br />
do come <strong>de</strong>ter a Carbone come mantra po<strong>de</strong>me ■ medir [elms cm potincia <strong>de</strong> ate 10 V (ratio<br />
sinal/ru(do ■ 1). 0 q maser <strong>de</strong> sir circa <strong>de</strong> BO mem sensivel qua o LiHbOo. pods<br />
ser empress& no ultra-violets proximo em cemprimentom <strong>de</strong> ends immerse qua 320na ends elite Ulti-<br />
mo criutal .io pods air utilizado divi<strong>de</strong> a am °partied§ mats map spectral.<br />
(FINEP. FAPESP. COPq, EMBRAPA).<br />
INS/9:20/iATF-1 PROCESSAWR INTEGRAOOR DIGITAL/ANALOGIC° PARA APLICACAO EN ESPEC-<br />
TROSCOPIA CON REsoLucho TEMPORAL. C.A. Santarine (UNESP-IPEA-Pros.<br />
Pru<strong>de</strong>nte/SP) a R. L. Zimmerman (P.F.C.L.-USP-Rib.Preto/SP).<br />
Cos finali<strong>da</strong><strong>de</strong> <strong>de</strong> se discriminar a integrar tempos <strong>de</strong> relasagio diferentes -<br />
provenlentes <strong>de</strong> usa masa amostra luminescent., <strong>de</strong>senvolveu-se a construiu-se um<br />
diapositive digital- analogic° <strong>de</strong> baixo mato, cujo principle <strong>de</strong> funcionamento -<br />
consiste na utilizacie <strong>de</strong> um circuit° <strong>de</strong> engstilhamento eletr8nico <strong>de</strong> tal forma<br />
qua me posse Ouster uma janela <strong>de</strong> tempo na qual só 0 tempo <strong>de</strong> relaxacio <strong>de</strong>seji -<br />
vel posse ser cerecterizado. Tal diapositive pods ser utilised° perm <strong>de</strong>terminagio<br />
<strong>de</strong> balsas concentraciies <strong>de</strong> ions luminescentes em solugio, cos resulted°, bastantes<br />
satisfatOrlos.<br />
(PatrocInlo CNEN Comissio <strong>Nacional</strong> <strong>de</strong> Enernia Nuclear<br />
1118/9:40/5A.F SISTEIIAS DE TRANSFERENGIA DS DADOS SCALER/NTCROGONPOTADOR<br />
Ma Maria <strong>de</strong> Paula Miguel Teems Moire - Departmento <strong>de</strong> Ffaica ICE. UFMG<br />
Os scaler's sae equipamentos tipo conce<strong>de</strong>rs. ds pulses eli aa i aa s. A centavo i scumula<strong>da</strong> duran<br />
to um carte interval° <strong>de</strong> tempo sprees:ma<strong>de</strong> no visor. Normalmence a medf<strong>da</strong> i lids visvalmente.<br />
lmplementamos on ' no qual o computsdor controls o tempo <strong>de</strong> medi<strong>da</strong>, li as contagens<br />
limps os regimtros pare aaaa ■ medidss. Ems' funcie ■ ■io implementa<strong>da</strong>s per use interface que<br />
se commie* con qualquer microcompumdor ate - <strong>de</strong> sue ports serial e cm es ■caler's per um<br />
barramento peralelo.<br />
Este equipment° esti san<strong>de</strong> used° 'ono parte <strong>de</strong> on mistime mutomitim <strong>de</strong> medidss <strong>de</strong><br />
<strong>de</strong> em espalhamento <strong>de</strong> lux.<br />
(ver tambim eecio <strong>de</strong> paiah.)<br />
i<strong>da</strong>
1145/10:15 , SE Fl "MACNETOMETRIA COM FILMES FENS DE PERMALLOT H - Ramon Vans Martin<br />
m Nei Fernand , " <strong>de</strong> Oliveira Jr. - leacituco <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> USA.<br />
S <strong>de</strong> campo ■ magnitices <strong>de</strong> alt. sensibilidb<strong>da</strong> a resolucio fore. d 1-<br />
vi<strong>de</strong>s partindo-se <strong>de</strong> filmes fiuo ■ <strong>de</strong> Famine,' (Fe-Mi).<br />
Egteg-filmee ',presences um ■ auisotropia induzi<strong>da</strong> pals aplicacio <strong>de</strong> um campo mag<br />
nitico du aaaaa sue <strong>de</strong>posicio em evaperadora apropria<strong>da</strong>.<br />
Duos families <strong>de</strong> eeeee tea totes analise<strong>da</strong>m:<br />
- resistive' - (obtid<br />
<strong>de</strong> ticnicam fotolitogrificas) ap m a <strong>de</strong><br />
penia;7177171 resistivi<strong>da</strong><strong>de</strong> do films com o campo aplicado.<br />
- indutives - utilises bobinas <strong>de</strong> ind - is voriavel cup', nicleos sio entitles<br />
too pale sobraposicio <strong>de</strong> varies filmes.<br />
Sensibili<strong>da</strong><strong>de</strong> Lipid. <strong>de</strong> 1 Vollo/Oe a Unites <strong>de</strong> <strong>de</strong>taccio <strong>de</strong> 10 -5 Oe sio obti-<br />
dos cos filmes <strong>de</strong> 700 a 2000 X <strong>de</strong> asp
INS/13:00/64.F<br />
CORSTRUCAO DE UN MODULADOR ACUSTO-OPT100 PARA mama= Q. Vaguer <strong>de</strong> Rossi,<br />
Coma Eduardo Calve Noreirl, %Aro Penha Horst° s Nilson Dias Vlice Junior<br />
(Institut° <strong>de</strong> Pesquieas Boargetzesa a Nuclesres - IPER/CNR.D711 0).<br />
O objstivo do trabslbo e o <strong>de</strong>senvolvimento <strong>de</strong> no chaveador seusto-optics pars<br />
"Q-switelline <strong>de</strong> 1 .w. <strong>de</strong> Nd:TLY. Rasa ChiVOIWOr consists no <strong>de</strong> ersnedutor piesoslOtrico<br />
qw propaga pe<strong>da</strong>l sciatica. nun bloc° <strong>de</strong> silica que intercepts o false &intro do ressooador Optico.<br />
Elsa. °Was acisticsm silo "Wants. e guano° tranadutor i excited°, use gra<strong>de</strong> <strong>de</strong> Lass volumetric.<br />
e formula no interior do bloco difratando o (ein par, fora dm raga° <strong>de</strong> alinhamento do<br />
laser. Asia, durance a excitacio ' nisi° atilm eruasen. murnie perm, postariormente,<br />
quando as co<strong>da</strong>s sciatica. evanescerem, <strong>de</strong>searregsr ease allergi ■ num pulse emote.<br />
Pere teeetteit Goss .odulador. o bloco <strong>de</strong> silica fundi<strong>da</strong> tem as suss faces, quo esti° ao<br />
longo do feixe, formando o ingulo <strong>de</strong> Bragg par. a reds <strong>de</strong> difracio. Alio disco, a face °poste ao<br />
dutor esti inclina<strong>da</strong> ■ 100 pars guitar a formaci <strong>de</strong> on<strong>da</strong>s scOsticss estacionirias no bloco.<br />
A limina transdutora tem ume esp. <strong>de</strong> 1/4 <strong>de</strong> mo<strong>de</strong> sciatica par. a frequincis <strong>de</strong> MHz. no 39<br />
harmOnico. Pretend. -se inicialmants es aaaaa risar ■ respost ■ spectral <strong>de</strong>s.' lisle., pare obter a<br />
minima eficienele d. <strong>de</strong>fleseo do feixe e o msnor tempo <strong>de</strong> evanescincia <strong>da</strong>m co<strong>da</strong>s salaries. no dii<br />
metro do feilm.<br />
IN5/8:20/6A., UN NOVO MET000 PARA DETERMINACIO DE PEOUENOS DESLOCARENTOS ANGULARES EN FEIXES<br />
LASER. 5.M.N.Mello, Marcos Ta<strong>da</strong>u T. Pacheco (IEAv-CTA) L.C.M. Miran<strong>da</strong> (1NPE).<br />
Foi <strong>de</strong>senvolvi<strong>da</strong> uma ticnics pare a medi<strong>da</strong> <strong>de</strong> pequenos <strong>de</strong>siocamentos angulares en feixes<br />
laser que dispense a utilixacio <strong>de</strong> sensores <strong>de</strong> posicio. Esta ticnica se baseia no Tato <strong>de</strong> que a<br />
refletivi<strong>da</strong><strong>de</strong> nas faces <strong>de</strong> um prisma .varie o angulo <strong>de</strong> inci<strong>de</strong>ncia nas mesons, sendo que esta<br />
variacao a nuito grand, na regiio proxima ao angulo ceftico.Sendo assim, a passIvel relacionar a<br />
amplitu<strong>de</strong> <strong>de</strong> oscilacio com a variacao <strong>da</strong> intensi<strong>da</strong><strong>de</strong> do feixe.<br />
Este procedimento foi originaimente <strong>de</strong>snvolvido pars se medir o efeito mirage,on<strong>de</strong> os<br />
<strong>de</strong>slocamentos angulares sio <strong>de</strong> or<strong>de</strong>m <strong>de</strong> milirradianos, a possui uma vista gams <strong>de</strong> aplicacies tennoligicas<br />
tail comp o nonitoramento <strong>de</strong> vibracio no estruturas.<br />
INS/B:40/6A., Medici° <strong>da</strong> emeceptibili<strong>da</strong><strong>de</strong> elitrica em balsa frequinels<br />
M. 11 era exists pouts laminae in relacie a medicOss <strong>de</strong> suceptibili<strong>da</strong><strong>de</strong> elitric ■ em bales<br />
frsquencia. Por consi<strong>de</strong>rarmos no 'gaunt° <strong>de</strong> into aaaaa <strong>da</strong>ssovolvemos no ■istems <strong>de</strong> sedum abaixo ex<br />
plicado.<br />
A tensio <strong>de</strong> said. <strong>de</strong> no lotegrador <strong>de</strong>pends do inpedincia do capacitor <strong>de</strong> realimentscio. A medicio<br />
diets tnaio em amplitu<strong>de</strong> fame, coo um oselloscOplo <strong>de</strong> duplo false cm assert., permit. <strong>de</strong>terni<br />
nor a capacitOncl u as per<strong>da</strong>m do capacitor. Conic circuit° intsgrador eat: condo vid° um "latrine<br />
tro pars aproveltar sue alt. imps<strong>de</strong>ncla <strong>de</strong> entra<strong>da</strong>. Serio op dos resulta<strong>de</strong>s experimental.
INS/9:00/GOLF j HEDIDAS DE CONEMITI41DADE 111.82ATCACOM SAM TEMPO DE MISPOSTA<br />
Mauro Fin c Mario N. Selbich (institute <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> Univers'<br />
<strong>da</strong><strong>da</strong> Fe<strong>de</strong>ral do RC; Gran<strong>de</strong> do Sul).<br />
Towan<strong>da</strong> coma base um "coadutometrom por miii conntroido &uteri<br />
times impiemeotando um ■ istema <strong>de</strong> realimentagio pars aaaaa tar a pl<br />
_ . ee<br />
. do<br />
mesmoa par <strong>de</strong> coneeguir diminuir o tempo requerido pare estabillsolio me<br />
ditia <strong>de</strong><br />
.<br />
goes b ' - I. elitrica em escudo. 0 aparelho act<br />
ma referido utilise <strong>de</strong>eeccio elacronaa beitta frequincia (apron. 27 Ne). a<br />
realimentagio i obti<strong>da</strong> mallasedo um emplifica<strong>de</strong>r tom 'echo la<strong>de</strong> por<br />
Ceuta°. En nosso passive <strong>de</strong> banca<strong>da</strong> obtivemo ■ tempos <strong>de</strong> composts (cow<br />
e stabili<strong>da</strong><strong>de</strong> compeeivel 8 original) gee sio. polo , ma-ordUte<strong>de</strong> greed.e<br />
ll .<br />
1,15/9:20/6A.F INIONTAGEM E CANACTERIZACAO DE DETETOR PIROELETRICO. Antonio Carlos<br />
Nernsn<strong>de</strong>s e Nelson J.H. Gallo (institute <strong>de</strong> <strong>Fisica</strong> e QuImica <strong>de</strong> Slo Carlos - Universi<strong>da</strong><strong>de</strong><br />
do Sio Paulo).<br />
Monocristais <strong>de</strong> sulfato do triglicina (TGS) preparados pals tecnic ■ <strong>de</strong> absizamento<br />
<strong>de</strong> temperature em solucio ■quesa(1) foram utilizados cog sucesso na montage.<br />
<strong>de</strong> um <strong>de</strong>tetor piroeletrico pare °parer na regiio do infrevermelho do espectro eletromagnitico.<br />
0 <strong>de</strong>tetor i compost° <strong>de</strong> time lamina <strong>de</strong> TGS <strong>de</strong> 200 microns <strong>de</strong> espossure<br />
obtids straves <strong>de</strong> clivagem perpendicular ao eign f.rrnelatrico, cujo coeficiente<br />
piroelitrico na temperature <strong>de</strong>'269C <strong>de</strong>3.10MiwaemWium PET BPW11. um resistor<br />
<strong>de</strong> cargo <strong>de</strong> l0llohms e ums.janels <strong>de</strong> lar <strong>de</strong> 600 microns <strong>de</strong> espessurs. A respon<br />
sivi<strong>da</strong><strong>de</strong> do <strong>de</strong>tetor na frequincis <strong>de</strong> 13.8Hz a do 3,79/N na temperature <strong>de</strong> 26 0C e<br />
o tempo <strong>de</strong> resposta dm or<strong>de</strong>m <strong>de</strong> lmseg. Nodificacoes estio sendo realizs<strong>da</strong>s cog o<br />
objetivo <strong>de</strong> aumentsr a responsivi<strong>da</strong><strong>de</strong> ■ beim frequincis e assim tornar o <strong>de</strong>tetor<br />
competitivo comos encontrados no mercado.<br />
(1) Hernan<strong>de</strong>s.A.C.;Gallo,N.J.N. - Anais <strong>da</strong> 38' SBPC.38(7):345,juIho do 1986.<br />
INS/9:40/6AS LITocsarza roe P5111 DE ELITROCS EONTROLADA PON COMPUTADOS<br />
Sidnei Faciornik, Real Almei<strong>da</strong> Nunes. Eduardo Conceives Selma.<br />
Luis Carlos do do Cargo - rucfar<br />
A ball:Elie <strong>de</strong> feints <strong>de</strong> aliening as criagio <strong>de</strong> io<strong>da</strong>tes em crietais oo as<br />
confecsio <strong>de</strong> immerse es materiels eletro-seservele se 00000 &tea em Mimics role<br />
oo ee no pro<strong>de</strong>gio <strong>de</strong> dispooltives totegradon eletrielco ■ e/em &aces.<br />
Neste trabelho <strong>da</strong>me 000000 e o <strong>de</strong>ssowelvimento <strong>de</strong> um-elsteme <strong>da</strong> progremegie<br />
em mi putador qua permit' tranolear pine one maitre Wass geolitticos<br />
&armies por um programa <strong>de</strong> Prolate Misleads per Compotedor.(CAD) stray: ■ do toe<br />
trete ■otomitice <strong>de</strong> WIOU pOSiCi to sob a fete. <strong>de</strong> slitters.. A ammatra seta<br />
press a ums mesa <strong>de</strong> coor<strong>de</strong>oa<strong>da</strong>s cow <strong>de</strong>slocaieeto IT sue tom sea merimentagio Coo<br />
t rols<strong>de</strong> por 2 motor's <strong>de</strong> passe <strong>de</strong> 300 p iievologam geopledo ■ etyma!!! <strong>de</strong> "oar<br />
dine duple@ quo minimise ■ problema ■ <strong>de</strong> alinhannete e vlbragao.
INS/PAINEL<br />
CONSTRUCAO OE UM PORNO RAPIN PARA APLICACAO ER DIFUSA0 E TRATA-<br />
MENTO TeRMICO OE SEMICONOUTORF.S - Alexandra Sonsisglo LuJon, Francisco Carlos do<br />
Prince. Emilio Carlos Bortullucci - Leboretorlo dm Pea/mime am Oimpositivos TLPD)<br />
Institute do Fiala. "Clot) Roteghin'T UNICAMP.<br />
F 00000 rapldo ■ sio <strong>de</strong> grand. internee eplIcecia rn procommedo fabric.-<br />
gio <strong>de</strong> semicondutorms. Em aural use. limpodos dm hmloginio pare aqueolmonto <strong>de</strong><br />
//rostra. so contririo dm um forno o 00000 clone). quo use urns resistincle eletrics<br />
Osseo forme. no form ripido o aquecimenta do amontrm i folto por rediegio dos<br />
limp/Woe. nio par oonduqem tirmica do calor gored° por umm remintincia. a quo<br />
Barents umm alto taxa <strong>de</strong> ■ubi<strong>de</strong> do temperature no °metro I<strong>da</strong> ardm ■ <strong>de</strong> urns cents<br />
no dm grous por ■egundo).<br />
No nano. projato usomem 18 limpe<strong>de</strong>m <strong>de</strong> hologinlo. co<strong>da</strong> umm cam 1000 wilt*.<br />
dm pot:nolo. Am limpa<strong>da</strong>s mio disowns. em tarno <strong>de</strong> um tuba dm quortzo. ond ■ a co<br />
locadm ■ mmestro.<br />
Ogle tipos <strong>de</strong> control. do temperature imam Implementodos. um manual o o ou<br />
tro por microcomputodor. 0 umo do mdcrocomputedor nom permitiri nee ad control.;<br />
a tool/en/tura. ems a sue taxa dm mubitim. .Lim <strong>de</strong> t pomsfvel oiclom <strong>de</strong> pre -<br />
equmclmento.<br />
As aplIcegbes doss tipo <strong>de</strong> forno o ripldo (do or<strong>de</strong>m <strong>de</strong> <strong>da</strong>-<br />
O 0000 0u megundonl. 0 gum vita quo oc 00000 dir oo oo na sommtre. ■ dif re-<br />
se ■ I<strong>da</strong> or<strong>de</strong>al."). 1000A') <strong>de</strong> Impurezem dopmntem em semicondutorms.<br />
Este trobblho i financiedo gm pert. polo FAPESP TELEBRAS.<br />
ri R PAVIL<br />
:::::71:! OCi c olErSTINADO A OBTENCAD DE AMENDS CR15TAI5 ESFERICOS<br />
P M CHAT:: lariucci (Dep. FLice Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral<br />
dm Cole.) Gorgon A. SontasIn (TPCJI UNE5P) Presi<strong>de</strong>nts Pru<strong>de</strong>nt. - SP.<br />
Em pistol/wefts eetrutural a forms guastarica do &metre cristalina<br />
muitas voles o um Important rotor no <strong>de</strong>ter/minima° <strong>da</strong> ettruture f urns vos quo a vre<br />
cilia <strong>de</strong> correao do mbeoram a ger spliced' <strong>de</strong>pends fundomentalmente <strong>de</strong>mi. ograme<br />
tr.. Iota so lustlfice &mid° so tote do qua nee amoetrme com geomtria irregular<br />
a resolupio <strong>de</strong> emtrutyre.tornm.49 praticamente impoesivel, poLo, as metodos,<strong>de</strong> cos<br />
row dmenwoLvi<strong>da</strong>s go ago aolioareis a geomotria ■ regulars' (por ex.s eefericse,<br />
cilindricas g ...).<br />
Com a fineli<strong>da</strong>d <strong>de</strong> se orodutir crLeteis com ggmetria sofirica, <strong>de</strong>een.<br />
volveu■eg e construium um dimmeltIvo meconico conOtpuido <strong>de</strong> um. timers On<strong>de</strong><br />
s■ostra s econdiclona<strong>da</strong> Pszendo.a carer sobre ume gcgmo circular cujas.pare<strong>de</strong>s in<br />
ternas .base vim constituf<strong>da</strong>s dm materiel abroolvg mom granule-min verievel. A<br />
smootre 0 acione<strong>de</strong> par duos tornados conecta<strong>da</strong>m a camaro e .etas s Linho <strong>de</strong> er como<br />
rimido mete. Com este dispooltivo foram prodpi<strong>de</strong>s Worse comdiametroe <strong>de</strong> 0.2<br />
■ 0.5 EN. a Palette <strong>de</strong> mat/minis <strong>de</strong> duromg vorlavel. (1 ■ 7.5 ne moola Mohe) cos re<br />
sultodos conei<strong>de</strong>rsdoe ltamant sotimfatorio.<br />
OMP<br />
INS/PAINE'.<br />
00 CON Au.<br />
ARSZNOOLOINZATO OB UM SISTRMA PAPA USSR ANNULLING DI Si =PLANTA<br />
R.A. Mribeca. UPPb, B.J. Lima. Voicomp J.B. Nicola. Usleamp<br />
Neer trot/alb. aprseetaramem um lifetime pars Laser Ammeallea dm<br />
supernal.. <strong>de</strong> Si implemtado mom Ae+ 1 com o objstivo <strong>de</strong> recrietmlimor a superftcie<br />
modifice<strong>de</strong> pole bombar<strong>de</strong>ameoto <strong>de</strong>s Ion s Rote sisteum compremo<strong>de</strong> em ■<br />
memti<strong>da</strong> es atmosfer ■ <strong>de</strong> Bia i 00000 cam a ememtro pase a um bloco mg/Lingo<br />
■ per singe°. mediamte bombe 00000 o aspi do mom bombe <strong>de</strong> icoo prim;rio.<br />
0 suports do upset' ■ ; equeci<strong>de</strong>. per uma resisaseim embutids mo prOprio imports<br />
do emontra, sue<strong>de</strong> a temperature <strong>de</strong>uce costrola<strong>da</strong> per um ledor <strong>de</strong> tompereturm.<br />
Todo o mimcomm a 000000 a-mm aostodo roma moan X. I comer/sled. pot um ■f<br />
ptador. limmte sistemm o Loser porno/here parado gee 00000 ■ amostro a quo movilmotm.<br />
Buts "moiety 00000 tro-se em foss final <strong>de</strong> acsbammoto.
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iNS/PAINEL 1.tetuglo oh totAclo BMA 11111TIDA 01 MLR.= PIR111003.11adi V.R. ad<strong>de</strong>d (In ■<br />
Utast) <strong>de</strong> Pesgaioss Ingtviticas Nuclear's. Comissin ■acional <strong>de</strong>inevaia Nu<br />
clear. Sio Paulo).<br />
Apia ■ essiststia0 fens laboratories <strong>de</strong> Realms* Union (1310) en Relmstasn, ilammha. dm Spa<br />
cartes Upon <strong>de</strong> ■atilsjos pinta**. do procatrancia 'tallow. min radioativos, no present, embalm<br />
Form utillsa<strong>da</strong>s smostros termoluminamcontem ultra-finds (60 um) <strong>de</strong> CaSperin pars ■ <strong>de</strong>torminagio<br />
<strong>de</strong> taxa. do dose absorwi<strong>da</strong> no ar ( canto no superficia dos asnlajos coop ■ Sem dm distancla e <strong>de</strong><br />
'atoms <strong>de</strong> trananissio pars difereetes canadss equivalences a tecido. iedM Ti*, pars compares:a. re<br />
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jos, ■ coo revestiosnto <strong>de</strong> ssulejos mingles sem ornamseces coleci<strong>de</strong>a. Wastes cases futon ebtidoe<br />
valorem quo nap norualnente ancontrados on material* <strong>de</strong> construgio.<br />
INSLPAINEL &mosso own= mutricgss. - szomemmurtota<br />
m Metes Rtheire Ana Maga <strong>de</strong> Ai<strong>da</strong> ;war CeeelSe<br />
<strong>de</strong>pertaments <strong>de</strong> <strong>Fisica</strong> - ICU - UPNO<br />
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(Its ds papal 'trawl. <strong>de</strong> em teiattpe. Dwesawatneeme eon Lesselasa ewe eseme<strong>de</strong> eassrma 42 soma teatisa blatcad a stag<br />
eke <strong>de</strong> <strong>de</strong>an. A Interface i Med. fermi. is hi<strong>de</strong> serial wad RS 132c a 011021 etarasing!tidir qua 4[10004 diets<br />
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iNS/PAINFL 1- 111.SROVOLVIPENTO.LC UUS11tBTROS PINMER.C411000, !ABA urnmrAo ZI ► airagio SETA<br />
Leticia Lucent@ Caopolka Marinapferroirs Lin ■ . Institute <strong>da</strong> Plasquimad Inassiti<br />
cad a Maclean@ . IPRV/CIIEN ■SP4<br />
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0 CaS0007 a es dos estatiai ■ termoluminemeentaa maim menerveis a me sends unite utilisado<br />
ne ponitorecie <strong>da</strong> radish° i s ass. Pars a maniteregio dm Vadiahe beta ■ amps do doormats*<br />
la <strong>de</strong> radiasie sin fatores fun<strong>da</strong>mentals paws a reopoot ■ do dosisotro. Ami<strong>de</strong> 1 absorho<br />
▪ espalhmmonto <strong>de</strong>s particular bets no matiria. Pastilbss cermoluminmecantem <strong>de</strong> CaS000, Teflon<br />
cos eep mmmmmmm entre 0.10 a Mena fetes prodosi<strong>da</strong>s s uvulas, pars <strong>de</strong>tacgio dm cadiacio bets. As<br />
principmis proprie<strong>da</strong><strong>da</strong>s estu<strong>da</strong><strong>da</strong>s foram a reproducibtlidsds, manaibili<strong>da</strong><strong>de</strong>, <strong>de</strong>pandincia enersiti<br />
co, reap:its so fonclo <strong>da</strong> dose ablorvi<strong>da</strong>, <strong>da</strong>ddiannto titmice a limits Iasi= <strong>de</strong> <strong>de</strong>tach*.
INS/PAINEL IMETODO OF ANALTSE OE nispnrarrvns SEMICONOUTORES POR CONTRASTE OE<br />
VULIAMM LM M1CRU5CUPIA ELtIRONICA UF VAUI1EUURA. Roberto R.S. Pinto 0 Carlos A1-<br />
Sort° RIbeiro - (Oeportamenta <strong>de</strong> <strong>Fisica</strong> Aplicado - IFGW-UNTeaM10).<br />
O use do microscopic eletrOnice ds duns na corocterizacie<strong>da</strong>s dispositi<br />
vos ■ emicondutores vim Ben<strong>da</strong> spliced° am grand ■ oscals. tondo sido d ivido<br />
on sine <strong>de</strong> tionices pare anilise. lima <strong>de</strong>s principals ventagens do use do micros'<br />
copla ss dove ao fate ds per une tocnica nio <strong>de</strong>strutivs. Oontro motes tecnices se<br />
tra o contrasts di voltage's. quo consists se observer o diapositivo poloriza<strong>da</strong><br />
olstricamente. pormItindo duster forms abs rrrrr as rimless na suporficis e-<br />
✓omina<strong>da</strong> quo aaaaa m potenciels sldtricos difrsntss. <strong>de</strong>finindo ntio sus dissomis<br />
posigio. etc.<br />
Pere !onto is faz 000000 irio a<strong>da</strong>ptor ao microscopie elstrinica (SEMI um elstome<br />
quo permits inserir o diapositive no maims com poselbili<strong>da</strong><strong>de</strong> <strong>de</strong> varlar as<br />
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dote d 000000 lvido um.porta amostra quo permits ter cantatas elitricos col<br />
o exterior <strong>de</strong> maquins at - dos quote in se control'r a dispositivo.<br />
INS/PAINEL I KAFFJUIENTO BE CORMS& RN UN SIMMS DE CORONA. Joio Maui° ds Carvallo<br />
Campo. Jos: Alberto Ciacomsttl. (ONES? - Ilba Soltaira s Institute <strong>de</strong> <strong>Fisica</strong> (basica ds Rio<br />
Carlos - OSP - See Carlo).<br />
0 ■lots= ds corona i composts port use posts coloca<strong>da</strong> no sloe ds um cilindro um. piace<br />
plans. ssodo miss alice. isolsdos ntr el. A pouts e o cilledro podia@ sir polarizados i ss<br />
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uma goads qua permits wagger ■ distribuirio <strong>de</strong> correlate produrlds pals poota/cilindro. 0 objetivo<br />
dices trahalbo i caracterisar eletricasmat sate piston pare sua aplicacio ma dsposicio <strong>de</strong> ions<br />
(produsidoe pela anomie corona) sabre 'nostrum isolates.<br />
Sao sestrado ■ o mope/moot° <strong>da</strong> co 000000 (coleta<strong>de</strong> pule moods) es fungi° dos vi<strong>de</strong>o combine -<br />
cies entre distiocia punts-plea. tom e° <strong>de</strong> corona tease° di cilindre, coso tambim =did's &a<br />
co 000000 s <strong>de</strong> plies. ciliadro corona gm Iona° <strong>da</strong> tomaia <strong>de</strong> cilledro pars es parimetros 0000 i o ds<br />
corona distends poats-placs.<br />
INS/PRINEL I 'MAGNETRON' - EVAPORACAO CATODICA OE ALTA RAU° - CONSTRUCAO E<br />
APLICACAO. Sebastlia Eleutirio Filho. Eduardo A. Farah s Sergio A. B. 011ac<br />
(0 00000 omega° <strong>de</strong> <strong>Fisica</strong> do Estado Solid° s Clincta dos <strong>Materia</strong>ls. Uni<br />
versi<strong>da</strong><strong>de</strong> Estadusl do Compines).<br />
lvido um sioteme do vicuo pars <strong>de</strong>posiceo <strong>de</strong> filmes<br />
pals t<strong>da</strong>nice <strong>de</strong> evaporacio coridics ds alto rarso. A aveporagio cotddics <strong>de</strong><br />
alto ratio realized/ por elstro<strong>da</strong>s do tips 'magnetron'. utilize maims mound<br />
theca wafts por Isis permanents ■ ou letro-imis. Uma dos 00000 Rens <strong>de</strong> ticnloo<br />
este na possibili<strong>da</strong><strong>de</strong> do obtongdo <strong>de</strong> camadis com - ds <strong>de</strong>m:mice° ds<br />
microns por minutes. ratio ■ sta <strong>de</strong> 100 a 1000 ooze, molar quo s do 'sputtering"<br />
lona). Eats dispositIvo permits obtancio do materiels pare o<br />
splicecio no in<strong>da</strong>stria lotro-elstronice Option. (FAPESP)<br />
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A FOIMACE0 DA IMAM NO NICROSCOPIO IONIC° DE CAMPO<br />
Cafe M. C. <strong>de</strong> Camtilho ■ Institute <strong>de</strong> gales, Ores.<br />
V....■1 ■1■11wr<br />
0 Nicromcfipio noir° <strong>de</strong> Campo (Field Ion Microscope PIN) constitui Instru-<br />
mento caps' <strong>de</strong>, rotinairameets. foreseer imams <strong>de</strong> ouperficies. 'mop mmmmm super<br />
acts& ostilicas, con remoluseo di cordon <strong>de</strong> 2 A. Apessr <strong>de</strong> ■ risyso loc./ do<br />
camp* stitrico sir aspect* bootee is istsrpretagio <strong>da</strong> fornaiio <strong>da</strong> /mess= e do con<br />
crests no F/M, discut-so comp fete se manifesto - s at <strong>da</strong> coucutrsiio do<br />
ses iragesate ou di probabili<strong>da</strong>ds <strong>de</strong> ionIsagso. U. mo<strong>de</strong>l° pars o camp* Istria°<br />
prAzino <strong>da</strong> ■uperfrcie do smissor foi estsbelecido a, a_partir <strong>da</strong>l. aaracterrsti -<br />
car operaciouais do FIN; coma a sego/ogle, as coediioss &Inas e <strong>de</strong> °virago°.<br />
calibrasem do comp* no superficie do emissor, etc.; eao colcula<strong>da</strong>s, tondo-se ass<br />
possibilid ■<strong>de</strong> <strong>de</strong> conparsr a influlacia di concentric:* do sss d. taxa <strong>de</strong> font<br />
magi°.<br />
Apoio CAPES
CRISIA1S L1QUIDOS<br />
Coord.:- John D.Gault (UFSC)
LI0/8:00/AN.F JSINTESR E PROPRIEDADES HISONORFICAS DA MID HOKOLOCA 4-a-ALCM-<br />
SAL1C1L10211-40-n-ALCOXIAN1LINA: Hugo Collards a Ririe Joselene Noro (Departamento<br />
dm Sluice, Iluivera<strong>da</strong>d ■ Fe<strong>de</strong>ral dm Santa Cotarint).<br />
No promote trabalho stu<strong>da</strong>-me comportment° nasomorfico a of <strong>de</strong> <strong>de</strong>s um-<br />
bras dm .iris homologe 4-n-alcosia ■licili<strong>de</strong>n..4-n-alcosimnilimm. Mo<strong>de</strong>m-me sum tem<br />
'levet aaaaa <strong>de</strong> transicie so mi 'pio dm lus polarisa<strong>da</strong> termomtatimsdo a PAAPALA<br />
MM ■ termodinimices con mistime termica ■ diferion[ol <strong>de</strong> varredoro (DSC). presence<br />
<strong>de</strong> um grupo hidromilo en positio orto permits s forma° dm umm forte pence<br />
hidrogini nom itomo dm sitroginin rasp ' 1 per ■ estabilimacio <strong>da</strong> mmfam va-<br />
nities par" o ■ primairos trio membros <strong>da</strong> sirie o■ la a 3, pmrtir dm on4 me n.S<br />
o b -se um dimorlimmo cos presses. <strong>de</strong> duos meeofsses, amities m semiotic'.<br />
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con o aaaaa to dm ca<strong>de</strong>ia alquilica (u). A wefts" oemitica ape aaaaaa e efeito<br />
par-imper nom e a to do me<strong>da</strong>ls alquilic ■ m somata ■ estabilidm<strong>de</strong> <strong>de</strong> nameless<br />
e mictica; assist par n.9 a 10 ■i obis -me a msofase monistic.. To<strong>da</strong>s os Com-<br />
postss ■ intetimado sin ap aaaaaaa m termocromisno no sited° liquids crintalio.<br />
LI0VS:20/4A.F<br />
ELETRETOS DE NEKBRABAS I8NICAS! BYLVIO OUEZADO. Departamenta<strong>de</strong><br />
<strong>Fisica</strong>. CCT-UFPb(CO).<br />
Nafion ; um polimero perfluorosulfOnsdo cm estabili<strong>da</strong><strong>de</strong> quimica<br />
mecinic ■ e tirmica aemelhante ao Teflon.<br />
Aniline per Tecnicas <strong>de</strong> Correntes Termoestimula<strong>da</strong>s revels a exis<br />
allele <strong>de</strong> dolls picos <strong>de</strong> <strong>de</strong>spolarleacio. 0 pico em torno <strong>de</strong> 373K i <strong>de</strong>pen<strong>de</strong>nts do<br />
comp <strong>de</strong> polarivecio e contribul com 2/3 <strong>da</strong> polarizagio total quo i d ■ or<strong>de</strong>m <strong>de</strong><br />
10-e Um. . 0 mound° pica ocorre en torno <strong>de</strong> 423K e i in<strong>de</strong>pen<strong>de</strong>nt, do camps <strong>de</strong><br />
polarizagio. Provavelmente este dove-se son cations s aqueles is co<strong>de</strong>ine late<br />
ralivexistentee neste polimaro.<br />
Kati em estudo a influancia <strong>de</strong> 'ague absorvi<strong>da</strong>. beim coed s mobili<br />
<strong>da</strong><strong>de</strong> <strong>de</strong> cations e moliculas <strong>de</strong> 140 nestas membranes.<br />
I Trabalho parcialmente financiado polo CDPq.<br />
LID/8:40/4k NO1DAS DR SUSCHT1S1L1DAM COMMA NH INMADIFLUIDOS - Norms S. Imer<strong>da</strong> Santos e<br />
Fernando 0. Vim Wolfer - Deprtameato dm <strong>Fisica</strong> - ICIS<br />
/Iodi<strong>de</strong>s <strong>da</strong> 'bili<strong>da</strong><strong>de</strong> complex. em fungi° <strong>da</strong> frmoiocim po<strong>de</strong>m <strong>de</strong>r inforomiam more Romanis<br />
um dm absortio. No caso <strong>de</strong> furroftuldom um escesiamo <strong>de</strong> balsa frequincia aeramate i<strong>de</strong>ntifici<br />
val ma<strong>de</strong> ralacimado cm o tempo<strong>de</strong>morLentacio <strong>de</strong>s paranoias qua compiam o ferroduido. Mum<br />
. tape posterior po<strong>de</strong>rla se estodmr comportment° dm particulate <strong>de</strong> !errata/a nom <strong>de</strong>pantem<br />
mm umm =tau <strong>de</strong> cristal liquids.<br />
Cosmos ■tualmente on fame <strong>de</strong> d ■ssmolvimmuto <strong>da</strong> amino <strong>de</strong> medi<strong>da</strong>.
1 LI0119:00/4A-F 1 ISPALBAMBUTO BATLIMOR TM GBISTAIS IIQUEBOS LIOTIGFICO2 - Marcus . S. Lacer<strong>de</strong><br />
Santos '-Usiverei<strong>da</strong><strong>da</strong> Fe<strong>de</strong>ral <strong>de</strong> Minas Gerais - Department° <strong>de</strong> Ftsica.<br />
U se programs visa inicialmente returner o estudo estudo <strong>de</strong> dinemica <strong>de</strong> flutuagies Cornices=<br />
to anelta<strong>de</strong>n nas Uses amities' (unieniai ■ a biaxial) a isorripiem do sista= 11-laurato, <strong>de</strong><br />
canal, igen. inleiado na Rinke teae (1)1(2) . A mativagin principal i o no<strong>de</strong> "auplamentar", is<br />
to e, o mo<strong>de</strong> <strong>de</strong> flutumcia lent& nio province pale mo<strong>de</strong>lo or<strong>de</strong>m-<strong>de</strong>sor<strong>de</strong>s puro. A bipitese <strong>de</strong><br />
tempo <strong>de</strong> vi<strong>de</strong> mieelar finite invocadm p.m azWei-1o (2) tem gerado elves cuntrovirsia, ■OM<br />
qua um neemnimmo alternative tenka si<strong>de</strong> proposed. Um estudo experimental mein aprofun<strong>da</strong>do faa<br />
DO ne EEEE irio, ben come no Wargo paroled° no plane eagle°. 0 intact <strong>da</strong>m mdigies esti COO<br />
dicianado a eemeluseo <strong>de</strong> montage= ors em curio (previerm pars julho/1917).<br />
(1) M.O. Lacerdm Benton. T. Galeria ■ G. Durand, Phys. Day. Lott. 32 ■ 787 (1984)<br />
(2) N.B. Lscer<strong>da</strong> lentos, G. Durand, J. <strong>de</strong> Physique 47, 529 (1986)<br />
1112/9:20/45.F I nurugOss micsuass zummunAs FOR amour.= mum's - Jos: Marcos<br />
Andra<strong>de</strong> Fieueiredo e Marcus 8. Lieer<strong>da</strong> Santos - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Minas Corsi. De<br />
pertinent° <strong>de</strong> Fisiem<br />
Flutuagie ■ colorises Untie. ■ssocia<strong>da</strong> ■ so perimetro <strong>de</strong> or<strong>de</strong>m nemi<strong>de</strong>o. no sistesm,IkLaurato.<br />
Decimal, hue. tam si<strong>de</strong> este/lido@ per empalbasento Rayleigh (correlagio <strong>de</strong> forone) 1 ".Usa ama<br />
lime <strong>da</strong> lux espelha<strong>da</strong> a frequencies macs slaved' po<strong>de</strong>rle <strong>de</strong>r informacao mobre flutuaceas a;<br />
nivel dos oblates individuals quo constituem fases, into e, micelan. 'rail flutuagies mi<br />
celares Lis si<strong>de</strong> sugeri<strong>da</strong>s na <strong>de</strong>nte° <strong>da</strong> pgeo <strong>de</strong> siestas "mal ' "( 21, alb;<br />
✓e olio se disponba <strong>de</strong> evidincia direr ■ <strong>de</strong>sta earacteristica. MOdi<strong>da</strong>s reeentes <strong>de</strong> neutrons <strong>de</strong><br />
alts resolugio em @elegies dilui<strong>da</strong>s <strong>de</strong> SDS( 3) foram interprets<strong>da</strong>l em termos <strong>de</strong> flutuacie ■ <strong>de</strong><br />
<strong>de</strong> forma a =mere <strong>de</strong> agregacio <strong>de</strong> mieelam. One estimative true, binnacle em um we<strong>de</strong>ln continuo<br />
(a micela a assimiladm a use place Heave!) di uma frequencia Entice pare essasflutua<br />
goes <strong>da</strong> or<strong>da</strong>in <strong>de</strong> 109He. 0 instrumento <strong>de</strong> valise <strong>da</strong> lux indicido i o interferemetro <strong>de</strong> Falai -<br />
Perot. Acualments estamos trabalbando nm imtlentagio <strong>de</strong>nte ricrac, (Espalbasento Brillouin) jun<br />
temente cos outran pesquisadores do Lsboraterio <strong>de</strong> apt Lea do Di6ur3 . A montages Optics i emir<br />
ma au <strong>de</strong>aenvolvimento pare a expert: cc i c <strong>de</strong> Rayleigh, vindo o Brillouin alargar sou use.<br />
Ref '<br />
1- M.B. Lacerds Sautes, T. Worse. C. Durand. Pkys. Rev. Lett. 53, 717 (1914).<br />
2- T. Hendrik:, J. Charvelin. H. Bevies. L. Labatt, N.C. Nolfts. J. Pbys. Chem. 87 (1983) 3991.<br />
3- S. Cosa., I. Ouplassiz, T. Lomb. J. Physique 46. (1983) 2161.<br />
1.10/9:40/4A.F I ESTUDO DO 8ISTEMA DODSC1L SULFATO DB ODIO/AGUA/DECABOL. L.Q.Amarml. M.Z.M.He-<br />
leen, 11.11. Sittencourt e B.Itri. Institute <strong>de</strong> Visit ■ do Universi<strong>da</strong><strong>de</strong> <strong>de</strong> lie Pluto.<br />
0 diagrams <strong>de</strong> lase do Diorama dodseil (lauril) sulfate <strong>de</strong> eddio/Aguid<strong>de</strong>cenol foi investigado.<br />
Foram lueelisadms s car ' <strong>da</strong>m per mieraseopia Optics a difrado <strong>de</strong> rains-2 fames nonAtiems<br />
<strong>de</strong>nse slates,. lie discutidos aspect°s do diagrams <strong>de</strong> fame em compered° eon mires anfifilicos<br />
e resultados <strong>de</strong> difrado es varies lases do simians.
LIQ/10:15/4A.F157,77G6To DR RAIDS >< FOR CRISTAIS LIQUIDOS LIOTROPICOS UN1A-<br />
XIAIS. <strong>da</strong> Rocha Santos Ilitt t ! Lia Q do Amaral (!FUSP).<br />
Forms estu<strong>da</strong><strong>da</strong>s Immo sssss <strong>de</strong> crimtais liquidos'nemiticom liotropicos uniamisis<br />
ituidos por ■olueio <strong>de</strong> anfifilico, :gun, <strong>de</strong>canol, cos c sem adigio do mal.Fo<br />
ram utilimados os =Milieus <strong>da</strong>cilaulfato <strong>de</strong> 'Odic <strong>da</strong>docilulfato <strong>de</strong> *Odin. Fo<br />
ram obtidos psalm d i 00000 i<strong>da</strong>ds difratad ■ <strong>da</strong>m aeo sssss om escudo i te sssss tura<br />
ambiente ea um difratilmstro <strong>de</strong> baixo ingulo. As fancies <strong>de</strong> interf ss ss i a entre Os<br />
objto ■ empalhado ■ foram obti<strong>de</strong>s, a partir <strong>de</strong> modlo ■ astruturais pare as laicals@<br />
<strong>de</strong> nesofssms nem:Liras unimxiais.<br />
01) 11'"'" r COMPAUCAD DO8 EFICITOS DR N114C1, Nark I MANDL SAS =SOFAS!!! DO<br />
SISTENA CDA/H 2 O. IC Antonio Leite a *John Dale Gault (*Colligio istsdual Ani<br />
teal Nunes Firms, *Departamonto <strong>de</strong> ■isica, U. a idmi<strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> 'ants Catarina,<br />
florisripolis, SC).<br />
Foram ■ laborados diagrasas <strong>de</strong> lases moatrando is afeltom <strong>de</strong> adieionar 1111 ACI,NaC1<br />
docanol a um aa i aaa 1 lfquido liotrOpieo <strong>de</strong>s clarets:, <strong>de</strong> <strong>da</strong>cilomiemio (DAC1)<br />
ague. Sabers eximtio difsreneas quantitatiaa, todos sates aditivos <strong>da</strong>stros ■ fa<br />
is hexagonal (so aaaaaaa raeims <strong>da</strong> or<strong>de</strong>al <strong>de</strong> i x 10 -2 molar) fsvoressam as fames<br />
o mmitica e laselar. 0 hit* d ■ NaC1 sabre an seaofass 6 mator do qua 1111 4C1 pro<br />
vavlments <strong>de</strong>vido a maior interaeio do Se cos a igua campanula coo Ne A . 0 <strong>de</strong>em<br />
.ol tem no efaito maior sabre as fames namitica a Instals? do quo Os doll 'aim.<br />
(CNN. PADCT).<br />
LIQ /-1°:5514A FIVARIACAO DOS VOLUKES PARCIAIS DR SURFACTANTE 11 £CUA NAB TRANSI-<br />
CONS DE VASES 8M 81STEKAS viontOrzcos COKPOSTOS DR CDA/NO4 C1/1120. 0yobn Dale Gault<br />
a Alfredo T.Nunes Fires (Departssento <strong>da</strong> Elsie. a *Dpartamnto do quisica,Uni-<br />
versi<strong>da</strong>ds Fe<strong>de</strong>ral <strong>de</strong> Santa Catarina).<br />
Utillsando ■sdi<strong>da</strong> ■ primates <strong>da</strong> <strong>da</strong>nai<strong>da</strong><strong>da</strong> so simtamas <strong>de</strong> clorato do <strong>da</strong>cilamisio<br />
(CDA)*NR Cl*HO, foram calculation on elum's molars@ ap do CDA dm iris.<br />
Na CNC o 4 *Policia <strong>de</strong> CDA momenta Da CNC at: o inleio do fame nemitiea o volu<br />
u s molar dm :gu ■ disinua circa <strong>de</strong> 1E. trauaicio do fame imotripies-esmitia,<br />
o velure <strong>de</strong> CDs aaaaa ta 0.1%. 0 papal do 8,C1 parses mar Important ma <strong>de</strong>tero<br />
inseio <strong>da</strong> <strong>de</strong>nsi<strong>da</strong>d do pistons a exparimenfos pars sect aaaaa r arc pout. patio<br />
em ■nd...pro.<br />
(CNN, FINEP).
I t0/11:15/4A.F iftCHICA PARA MED/DAS DE INDICES DE REFRACAO DE CRISTAIS LIQUIDOS<br />
LIOTRISPICOS. Ted R. Taylor, Gerson R. Ouriques e Maria L. Caselani (Depto <strong>de</strong> <strong>Fisica</strong><br />
- UFSC)<br />
Os indices <strong>de</strong> refragio <strong>de</strong> cristais liquldos liotropicos eio <strong>de</strong>flects <strong>de</strong> scram<br />
medtdos <strong>de</strong>vido a sua pequena anisotropla &tics. Este problems rot resolvido<br />
utlItzando-se um espectrametro-goniametro e um ((totems <strong>de</strong> aquecimento a refrige<br />
racio que funciona coma um element° termoeletrico (Efeito Peltier).<br />
0 cristal liquids) a introduzido em tubos capilares retangulares e entio se<br />
lefts nas extremf<strong>da</strong><strong>de</strong>s com Pogo a posterformente colocado entre dote originas . <strong>de</strong><br />
faces parnining. A extremldn<strong>de</strong> do tube no qual incIdtri a lux monocromatica a se<br />
Lads <strong>de</strong> tal manefra que fique uma superficle altamente difusora <strong>de</strong> luz. Assim.<br />
luz monocromittca torna-se dtfusa. eapalhando-se em to<strong>da</strong>a as direcaes straves <strong>da</strong><br />
amostrs.<br />
(Financlado polo FINEP. CNPq a PADCT)<br />
LIO/11:35/4A.F ESIVDO Dit TRANDIcAtiS DI FASE ealfiXIAL -BIAXIAL BM CRISTAIS LiqUIDOS 1.30216PIC0S<br />
=ESTERO:0S RED1DAS DE INTISSIDADZ IX LUZ. Mo<strong>de</strong>:We Xrein (<strong>de</strong>pte<strong>de</strong> <strong>Fisica</strong> UPSC) e Antonio Martins<br />
Figueirmdo Mete (Inst. <strong>de</strong> Plaice USP)<br />
Trmaiglies <strong>de</strong> Immo nniaximl -biaxial es critical. liguidom liotrdpicos (C.L.L.) nemdtico ■ tea<br />
si<strong>de</strong> ex eeee imamate estu<strong>da</strong>dma Lento telkiest:este come experimentalmentm. evi<strong>de</strong>nciando sere= eaten<br />
trensitam <strong>de</strong> somnds or<strong>de</strong>r. 0 *Native <strong>de</strong>ste trmbmlbo d estudsr a nnnnn icio em C.L.L.<br />
colestdricos, obti<strong>de</strong>m per mil) <strong>de</strong> dope's. dos C.L.L. nemdticos corn ums moldcule 6pticseents Reims.<br />
■travdm <strong>de</strong> mdi<strong>da</strong>s dm intensi<strong>de</strong><strong>de</strong> dm lum tressmiti<strong>da</strong> psia maitre guando colocs<strong>de</strong> entre polarisado<br />
rem crusa<strong>de</strong>s. Balm td ' permits a &mock <strong>da</strong> birrefriOncia <strong>da</strong> mesefsse. bem coma momtrou an<br />
"loop' <strong>de</strong> S' sob equectmento a remfriamento <strong>da</strong> smostra, gm pods a isle<br />
ease Is primeim or<strong>de</strong>m.<br />
LIG/11:55/4A. TERICIOADH /HUMOR Di LICMMONADDS NEDATDCAS ._. ANPIPLICC13 OPTICaMENTE<br />
ATIVog - Maria Elba Marcon<strong>de</strong>s Helens (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Univ.<strong>de</strong> S.Pauleal<br />
Liaresofases amigo:Arians forme prepara<strong>da</strong>s a partir <strong>de</strong> mesofases nemeticas<br />
<strong>de</strong> Laurato <strong>de</strong> potissio/I-<strong>de</strong>osnol/H42. tendo sbloadiciageba As magmas 0.05% em Mo<strong>de</strong> ferrofluido<br />
no intuit° <strong>de</strong>ctter-se a orientadb <strong>de</strong>s mesofases par camp magnetic° frac° (5-10G).<br />
Os =postai indutores <strong>de</strong> colesterici<strong>da</strong><strong>de</strong> forum A) N - lauroil - I - alani<br />
ne e 13) N - Mural). - L alaninato <strong>de</strong> potissio. Ouanti<strong>da</strong><strong>de</strong>s crescentes <strong>de</strong> ambos cs carpostos foram<br />
adicionedcs As mesofases nmniticas (discdtices) a observa<strong>de</strong>s as translefes <strong>de</strong> fases em furdo<br />
<strong>da</strong> temperature pare ce<strong>de</strong> uns <strong>de</strong>s mesofases cc<strong>de</strong>stdricas Inch/si<strong>de</strong>s. A !knits uss<strong>da</strong> fad a<strong>de</strong>ntempla<br />
dptics <strong>de</strong> lug pslarixa<strong>da</strong> undo sido as amostras coloce<strong>da</strong>s em ndcrosli<strong>de</strong>s <strong>de</strong> 0.2arn. <strong>de</strong> espessura.Fo<br />
ram cbserva<strong>da</strong>s textures correspon<strong>de</strong>nces a a c. Cher Cher AD. e he<br />
os resultados compares: 1) os diagrams do Ease obtidos (temperature x concentradol<br />
pars ce<strong>de</strong> lnaubor; 2) verfsdo dos psssos em CuncSo dm (=centred° doindutor; 3) efeitos<br />
<strong>de</strong> Interface vidro/cristal liquid° x aperecimanto do passo pare quenti<strong>da</strong><strong>de</strong>s mum.= <strong>de</strong> cm<br />
<strong>da</strong> imdutor.<br />
Chc- colestdrica calamities: Chic - colesterics biaxial; CH D - colestdrica diecdtics; ND - nem&<br />
tica discetice; Pal - polifesica; Lb - lemelar.
LI0/13:00/5D F PISMO DE DIAGRANAS DE FADE DE NESOFASES COLESTERICAS DE Lathe) DE POTASSIO<br />
(1.1.)/OECASOL (DeOli) /ACUMIRUCIPA(121)/.11.C.Vslente Loons s Antonio II.Figueiredo Seto (lite.fhtica LISP)<br />
Para a construclo dos diagrams ■ <strong>de</strong> foss sera utilisadm mem/Eases liotropicas colestdricas is<br />
Ami<strong>de</strong>s constitulds ■ <strong>de</strong> 1 <strong>de</strong> potiesio (IL/<strong>de</strong>cimal (IMOH)/dgus/sulfato <strong>de</strong> bradsm beptshidrata<br />
<strong>de</strong>(SS) sqb caw° magnetic° extern° (2). A pricmire stops do trabalhe consists am.faser an diagra<br />
ma <strong>de</strong> Lass on<strong>de</strong> °bagman a temper aaaaa e a concentreclo do @gents quire' (SO) s i<strong>de</strong>ntificar s an<br />
sofa.. colemtdrica cos sua foam <strong>de</strong> tempersturs valuing° di commit:act° molar (Hav1le1/(11111<br />
10020.112.1). As rases e s ■ aaaaa idles <strong>de</strong> fame silo ' dos pela testur. Optics observed& em<br />
wi apio dpcico can lus polariss<strong>da</strong>. A &Rostra I coloca<strong>da</strong> em um "microsli<strong>de</strong>" formsmdo oasis an<br />
films ds_cristel liquid° <strong>de</strong> sops 200p.m. coloca<strong>da</strong> entre polsrissdores crusados. 0 camps smi<br />
mitice (0) atua colocoodo os piano. colesterico. perpendiculars@ a sus direct t& par Eases Ch Disco<br />
e Ch Maoist fses colesterica calamities I <strong>de</strong>eenrolad ■ sabre ■ aclo.<strong>de</strong> A.Paralsiaments aq pal<br />
eedimento I. <strong>de</strong>terminor as trim:skiffs <strong>de</strong> fame fun -se a sedid do posse entre os pianos colestdriom<br />
pars fames Cb Dietetics. e Ch 'fasts'. As Hips squint's consist= em repetir 0 0e000 procediaan<br />
to ends a vorlacio <strong>da</strong> comcentragio do brucina sera anbatitui<strong>da</strong> psis gloriosa° do concentraclo do<br />
Decanol (Ds0H) do Lauranedo <strong>de</strong> Fotamsio (RI).<br />
LIO/Sq0/523-1 IMMO CONFARATITO DOS DISTENDS LIOTROPICOS COLESTSRICOS MIMS-<br />
COS E INDDEIDOS. A.N.Figuairedo Nato. L.Liebert e !.Calera. (Institute di <strong>Fisica</strong><br />
<strong>de</strong> DSP a Oniverite Parie-Bud)<br />
NOMDCOOM liotropicas colestirica ■ po<strong>de</strong>m ser obtidsopor meio.do "doping"<br />
<strong>de</strong> mesofases nmiticas cam molicula ■ aptioament ■ &siva.. No case do molicula qui<br />
rat ser um dos enfifilicos constituintes <strong>da</strong> mesofase Mecca on ■abio). iris<br />
tat liquid. colestirico obtido i chammdo iota a , am caso ttttt Arlo, a chewed°<br />
indusido. Como exempla <strong>de</strong> vistas& intrinsseo testis o laormto di pot:maim/I<strong>de</strong>canolid-2-octanol/igua,<br />
a indusido o lmureto ds potissical-<strong>de</strong>canol/igusbenlimto<br />
<strong>de</strong> brueloa beptehidrmta<strong>da</strong>. 0 vistas. intrinseco aprmsentou a sequincia <strong>de</strong> fame ■<br />
in lunch do temperature inverti<strong>da</strong> em salsa° so usualmente obseresdo em '<strong>de</strong>tentes<br />
colestiricos foi observad ■ a foss colestdrica calsmitic ■<br />
▪ balsa temp (--swg am gloom ofsturasi) s a fins colestirica discdtica<br />
■ altos tampersturas (-WC). Tal fate pods sitar lanceted° so tipo <strong>de</strong> ■coplemem<br />
to entre o agents quiral a micelle. <strong>de</strong> ma<strong>de</strong> a sodificar ignificativamemte a in<br />
torscio intermiceisr um fungi° dm temp<br />
■■■1 ■4NIWNOM<br />
LIO/8:A0/5A.F<br />
SIINTIDD DV TORCAO IN LIOMKBOYASES COLICBTSRICAS INDOCIDAR -<br />
.M, 4p Aldo. N. . Alcantara, A.K.O. Pereira A J.A. Tonle (Inst. <strong>de</strong> Qurmica -<br />
On vermi<strong>da</strong><strong>da</strong> <strong>de</strong> Silo Paulo)<br />
0 ■entido do torplo <strong>de</strong> licmesofases colestarioas prepars<strong>da</strong>s a partir <strong>de</strong><br />
novas indutores fog <strong>de</strong>terminado. Retu<strong>de</strong>rsm-se ■ intemem liotrapiame do tipo II.<br />
baseocloo em <strong>de</strong>cilsulfeto do EMI° (1305), claret° do <strong>de</strong>cilemanio(CDA) e laurato<br />
do potaseio (LR). Om referidoe indutores foram a D -ribose. a 0-glucose. a<br />
macaroon a o D-gluconsto <strong>de</strong> sadio. slam dos dots enantiameros do 2 -octanol.<br />
As textures observa<strong>da</strong>s nas diferentes emostras . apes orientacio parelel ■ em<br />
campo magnatico. foram hometrapicas. em algune casco cam <strong>de</strong>feitos. Sm orientscgo<br />
perpendicular. constatou-se campo clam,. <strong>de</strong> colorapao uniforms. sem extincao,<br />
cos algune <strong>de</strong>faitos filamentosos. Os sOtedos <strong>de</strong> <strong>de</strong>terminaclo <strong>de</strong> belici<strong>de</strong><strong>de</strong> foram<br />
co <strong>de</strong> cunha e <strong>de</strong> De Vries. Os indutores D-ribose o D -glucose <strong>de</strong>ram origem a<br />
mesofases levmtcroi<strong>de</strong>s. em to<strong>da</strong>m as emostras observa<strong>da</strong>s. D-gluconato <strong>de</strong> sr:di.<br />
formou Nasalises levotorci<strong>da</strong>s ea CDA e LE. Saceroes rorneoeu sempre =softiies<br />
<strong>de</strong>strotorci<strong>da</strong>s. Os indutorss D-ribose. 0-glucose, D-gluconato do sadio e<br />
secarose sic hidrotilicos a ■e distribuem entre a dupla cema<strong>da</strong> eliStrice <strong>da</strong>m<br />
micelas e a parcel, memos. A incorporacio dos enentlemaros do -octanol am<br />
mesofases <strong>de</strong> SDS (!ratio molar 0.210, montrou quo a 'mammy° D Indus levotorolo,<br />
e nquanta quo o L. <strong>de</strong>etrotorcgo. Estes results<strong>da</strong>s sugar= ■ aistematisapao dos<br />
efeitos <strong>de</strong> induce°. releeionando as caracteristicam duo molecules indutoram cos<br />
no <strong>da</strong> Nicole liotrapice. (FAPESP. CNN, PIMP)
qi■moll■ %rw-<br />
I- 11/9 : 00/ 5A - F o liFEITO DA CONCKNTRAC1.0 DE CKNTROS ' QUIRRIS SOUK 0 POD=<br />
ROTATORIO DE LIONKSOFASES COLISTERICAS INDDEIDAS - do 614q. M.R.<br />
.612E1493. A.N.O. Pereira & J.A. Benin (Inst. <strong>de</strong> WW1= - Dnivermids<strong>de</strong> <strong>de</strong> Slo<br />
Paulo)<br />
Liomesofesse a bays <strong>de</strong> Laursto <strong>de</strong> Pot&ssio (LK), Deollmulfsto do Wisp<br />
(SDS) a Cloreto dm Deoilam<strong>da</strong>to(CDA). indumi<strong>da</strong>s por ■orbome, se carsoterisam por<br />
ear levorotatarias <strong>de</strong> poem° longo. A varisolo do po<strong>de</strong>r rotaterio nom o<br />
comprimento <strong>de</strong> =We <strong>da</strong> lus inci<strong>de</strong>nt. permit* construir o gritioo <strong>de</strong> De Vries<br />
(ingulo <strong>de</strong> retool° x invermo do mis<strong>de</strong>ed° do comprismoto <strong>de</strong> ends). oujo<br />
coeficients angular este' relaoionado so poem oolentarloo e A birrefringdmis<br />
<strong>de</strong> amostra. Um correlaplo entre o coeficients angular (m) do grAfico <strong>de</strong>' De<br />
Vries e a quanti<strong>da</strong><strong>de</strong> <strong>de</strong> centres quiraim existent=s no meofase foi observa<strong>da</strong>. A<br />
referids quanti<strong>da</strong><strong>de</strong> foi expresso segundo um quociente (f) que pon<strong>de</strong>rs, a !rood°<br />
molar <strong>de</strong> indutor em mimic so baton's° hidrofIlloo/hidrofebioo dm diferentem<br />
cistemas (tombola on freolles molarem). A relagAo linear verifica<strong>da</strong> entre m e t<br />
mantra que o po<strong>de</strong>r rotaterio too<strong>de</strong>pen<strong>de</strong>ncia direta coo o flamer° <strong>de</strong> centrom<br />
quirais per micels a auger uma in<strong>de</strong>pen<strong>de</strong>ncia coo ■ naturems do anfifllioo<br />
empregado. <strong>de</strong>sd que tipo <strong>de</strong> intersolo entre o indutor s a dupla mused&<br />
e litrioa sejem ■amelhantes. Betas observaclem esti° sendo amteadi<strong>de</strong>s a outroa<br />
diatoms timtrespioom colesterloos. /APES?)<br />
LIQ/9:20/511.F I ORIENTACAO DE CRISTAIS LIQUIDOS LIOTROPICOS COLESTERICOS TIPO<br />
II NA PRKSINCA.D1( CAMPOS MAGNETICOS - T.N.S. do Aido. M.R. Aloantare. A.M.O.<br />
persica & J.A. Vanin (Inst. do QuImica - Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo)<br />
Verificou-se distorglo <strong>da</strong> textures chevron. assmia<strong>da</strong> & interaclo nom para<strong>de</strong>=<br />
on colas <strong>de</strong> =poseurs' critics an mimic ao pamoo oolestarico. Liomegofeses.<br />
mondicions<strong>da</strong>s on colas planes <strong>de</strong> 200 a 300 um do espessura , se basearam nos<br />
seguintas mistemas: CDA/DGK (discetona-2-certo-gulonato <strong>de</strong> potlissio) . CDA/L-LAK<br />
alaninato <strong>de</strong> potAssio). LK/colesterol. CDA/colemterol (sistames<br />
indumidos) o L ou D-LAK (colestAricos intrInsecos). Amostras orienta<strong>da</strong>s par<br />
campo magoltim, °Wm meanies 0°1.0M-icon tinham dimmed** muito senores quo<br />
▪ espeamurs <strong>da</strong> eels. exibtramo padrio chevron oaranteristico, an todom on<br />
ports-amostres empregadom. cormepon<strong>de</strong>ndo @more am memo valor <strong>de</strong> passo. Es<br />
oondig<strong>de</strong>s anAlogas. amostres do gesso grand. on releglo A espessurs dm cola<br />
mostreram texture hommotrdpim, coo einal 6ptico uniaxial <strong>de</strong>scentredo. Na<br />
ottani° intermedilria, as amomtrem exibiram chevron bem carafterletim no eels<br />
maim espessa. Na cola <strong>de</strong> 200 um. observou-se textures dimtorai<strong>da</strong>s coo o<br />
aparecimento <strong>de</strong> mettles homectrapicss. Kamm. em ■lams° amostrase ocuparam<br />
gran<strong>da</strong>m amongno, corrempoo<strong>de</strong>ndo to <strong>de</strong>senrclammoto paroial. do arranjo<br />
hallool<strong>da</strong>l. (FAPESP,CdPrq; FINEP)<br />
IUD/9140/5A. , Imo DS N-LAUR011e-ALANINATO DE POTASSIO COMO INDUTOR DE<br />
COLESTKRICIDADI KM LIMBO/ASKS - ha.a...sArtiLs. dp Aldo,<br />
Alcanterq Al 4.A. Vanjn (Inuit. <strong>de</strong> QuimicaF- Ilifiveki -i<strong>de</strong><strong>de</strong> <strong>de</strong> Sib -Paulo)<br />
Liomemofames colestlirIcam foram Indusi<strong>da</strong>m palm enantilimerce <strong>de</strong> N-Lauroll-<br />
Almninato <strong>de</strong> PotAssio (LAK). Os enfant:me use<strong>da</strong>s foram: clorato <strong>de</strong> <strong>de</strong>eilesdnio<br />
(CDA), <strong>de</strong>cilmulfato <strong>de</strong> ■ddio (SDS) s laurato <strong>de</strong> portliest° (LK). Foi passive'<br />
prepares mesofasew colestericms do tipo II, incorporando-se <strong>de</strong> 0.12 a 0.31 t, em<br />
fracAo molar, <strong>de</strong> D au L- LAIL. As dimensbe ■ do mom colestArico. on *metres<br />
orienta<strong>de</strong>s, <strong>de</strong>pen<strong>de</strong>m do anfifIlico . Em mistems baseadom em SDS , obmervou-se<br />
texture chevron. correspon<strong>de</strong>nts a um pa:so <strong>de</strong> ca. 20 pm. Km orients:ma° memalhante.<br />
statesman A balm <strong>de</strong> CDA mostraram pammo <strong>da</strong> or<strong>de</strong>m <strong>de</strong> BO pm. A helici<strong>da</strong><strong>de</strong><br />
indusi<strong>da</strong> nee mesofases polo D-LAK e' <strong>de</strong>strotorci<strong>da</strong> em SDS a LK. a levotorci<strong>de</strong> em<br />
CDA. Efettom correspon<strong>de</strong>nts= <strong>de</strong> induclio sin observadom cam L-LAK. A mu<strong>da</strong>npa d ■<br />
helici<strong>da</strong><strong>de</strong> indusi<strong>da</strong> polo mamma enantamero pads ser racionaliaa<strong>da</strong> em terms <strong>de</strong><br />
mu<strong>da</strong>ma <strong>de</strong> cargo <strong>de</strong> cabega ionica do anfifflico. Mesofames coleetericse do tipo<br />
I foram preparadm cm D-LAK/SOS a L-LAK/LK. As textures observa<strong>da</strong>s, em &metres<br />
previamente orlente<strong>da</strong>s, corramon<strong>de</strong>m aquelas jea' por nos <strong>de</strong>morita on mistemam<br />
semIhantes.Ume caracteristica marcents siestas mistemes do tipo I e' m<br />
birrefringencia extrammente baixs, manor qua 0,0005. (FAPESP. CdPq. Flan<br />
a
MAGNETISM°<br />
Coord.:- Carlos C.Becorrs (1FUSP)
MAC/8:00/4A.F I POLARITONS MAONITICOS Ell UN FILME ARTIFERROMAGNITICO<br />
M.A.AMATO E F.A.OLIVEIRA -DEPARTAMENTO DC FISICA - UNIVERSIDA<br />
DE DE BRASILIA -70910 BRASILIA DF<br />
Recentemente(1-3). a diecuseio <strong>de</strong> modos retar<strong>da</strong>dos(polarl<br />
tons) em geometrias finitas fol rstoma<strong>da</strong> <strong>de</strong> modo a incluir<br />
novos tipos <strong>de</strong> excltacOes(2) a diacutir regiio <strong>de</strong> existencla<br />
doe modos magniticcs <strong>de</strong> um filme tipo Mnf 2 . Neste trabalho<br />
<strong>de</strong>terminamoa tale regOea. relagaes <strong>de</strong> dlepersio a <strong>de</strong>nel<strong>da</strong><strong>de</strong><br />
<strong>de</strong> energia para eases modos.<br />
1.N.P.Lima a F.A.Oliveira J.Phys.C:Solld St. Phya.19.5301(1906)<br />
i.n.nuj a p. 1.Tllley Solid 3t.Comm.55,373(1705)<br />
SAO.<br />
e A.R.doa Santos submetldo a publica<br />
NAG/11:20/4A.F I CORRECOES LOCALS AO CAMPO DIPOLAR EM FERROMAGNETOS. N.V. Tovar<br />
costa. S. Selzer e N. Maiiis (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> re<strong>da</strong>ll-Mirrnenze).<br />
As interacees dipolares(elitricas au magniticas)geram, como 6 sabido, um<br />
campo local que, para abstains macroscopicos, <strong>de</strong>pends <strong>da</strong> forma <strong>da</strong> amostra. Usual<br />
manta, sio consi<strong>de</strong>ra<strong>da</strong>s amostras cam formal geomitricas cos simetria suficiente<br />
para garantir qua o Campo local seja homogineo no interior. Contudo, costae supo<br />
sicoes faits* para o cilculo do campo local hamogineo sio invili<strong>da</strong> ■ perto <strong>da</strong> su -<br />
particle. Consi<strong>de</strong>ramos. pars sistemas semi -infinitos, ou films, um mitodo Cara<br />
se Water a variagio do campo local cam a distincia i superficie. A combinegan<br />
<strong>de</strong>nte metodo com a tdcnica <strong>de</strong>s funcaes <strong>de</strong> Green permitiri obter palm priseira vex<br />
solucass autoconsistentes pare o campo local inhamogineo superficial.<br />
NAC/§E40 , ,,-F EFEITOS SUPERFICIAIS DA rwitu rAo DIPOLAR SAGNETICA EM FERROKAGNE-<br />
OW. N.V. Tovar Costa, p. Sallie a S. Selmer (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong><br />
!Fe<strong>de</strong>ral Fluminense).<br />
omagneto COnsi<strong>de</strong>ramos qua e<br />
Estu<strong>da</strong>mcm a <strong>de</strong>pen<strong>da</strong>ncia <strong>da</strong> magnetixaqao e <strong>da</strong> relagio <strong>de</strong> dimpersio dos miqnons,<br />
cam a distancie A supsificie em um ferr<br />
tre os spins exlstem slmultaneamente a interagio <strong>de</strong> troca <strong>de</strong> Heisenberg entre pri-<br />
!metros vizinhos e dipolar megnitica clissica. Nediante o mltodo <strong>da</strong> fungio <strong>de</strong><br />
!Green po<strong>de</strong>mos obter Beluga:is autoconolatentes aproxima<strong>da</strong>s Ina RPA) pare a magnetiz<br />
lqao em cads - piano. em funqao <strong>da</strong> temperature e <strong>da</strong> orientacio <strong>da</strong> magnetizaqie em rel<br />
goo 5 direqao normal i superficie. A anisotropia <strong>da</strong>s interaqaes dipolarea enrique<br />
ce notavelmente as proprie<strong>da</strong><strong>de</strong>s. tante do estado fun<strong>da</strong>mental come <strong>da</strong>s diverse:a fa<br />
sos estAveis a temperature finita. Discutem-se as diversas posaibIli<strong>de</strong><strong>de</strong>s <strong>de</strong> reconstruqao<br />
superficial magnktica qua resultam.
NAG/9:00/4A.F MACNETIZACAO MO ANTIVERROMAGNETO DILUTDO Fejt:1_02 EM cmpos IRTENSOS : PRO-<br />
PR1E0ADES DEPENUENTES DA NISTORIA. Fre<strong>de</strong>rico C. Montenegro, Sergio N. Emend. s Muriel° D. Cmslim-MM.<br />
Department° <strong>de</strong> <strong>Fisica</strong> - UFPS. 50.000 Recife-FE.<br />
Raids, <strong>de</strong> maretleasio form realizadm no ■ tiferromagneto diluTdo Fe xZni...02. pars diforearm<br />
concentragoes <strong>de</strong> Lone magniricos: 11.1; 0,69; 0,46; 0,25. Utilisemes um magnetisers° <strong>de</strong><br />
Amostr ■ Vib (FAR) a<strong>da</strong>pted° ■ um Magneto sup doter cams <strong>de</strong> germ tempos Nag - ' -<br />
MC. um fame <strong>de</strong> temp .211cTrI00K. coo um controls AT-ZONE. Nes amp LLLLL come concentragies<br />
intersediirlas observamos efeitos <strong>de</strong> campo sagnirico aleatirio. Para a OMO5Cf ■ <strong>de</strong> balm<br />
concentragio (x ■0,25) i vim um comportamento peculiar, apico <strong>de</strong> um vidro <strong>de</strong> spin.<br />
A Emilia doe fluor:am <strong>de</strong> metals <strong>de</strong> transits° come : Fe 1Zei_02 e Anen1- xF2, sem se eonstituindo<br />
comp um doe misses.. Wass pare estudo do problems do campo magnetic° alearirio em mo ,<br />
<strong>de</strong>lve Islas (RF1R) nos antiferromagneros diltados em imps uniforms (DAM. experiments's:into<br />
rest' . N medi<strong>da</strong>s emplorm principalmente proprie<strong>da</strong><strong>de</strong>s <strong>de</strong>pen<strong>de</strong>nts. <strong>da</strong> bistiria, coma<br />
blstereses eo campo na teem meteorite:Mists' <strong>de</strong>pendincia ■ temporal ■ nos msg. -<br />
gine <strong>de</strong>s mo . C encentra<strong>da</strong> um sub ial diferenga <strong>de</strong> comportamento <strong>da</strong> magnetisagao ntre<br />
os ciclos " ices" ZFC (reefriamento campo nulo) FC (resfriamento in campo splicado). notadmente<br />
nag amostras corn baize CCCCC ntragao <strong>de</strong> ions Nag em b esperaturas.<br />
NAG/9:20/AA.F J MACRETIZA0A0 DE CLUSTERS DE re NO ALUMINATO DR LITIO E FERRO -<br />
J .N.Neto. F.N.Domin ues. E.S.Amortm. F.<strong>de</strong> S.6 - Inmticuto <strong>de</strong><br />
runi77: OF J e A.Cur otTriEin 'Louts Neel. CIIRS-DENC. Gre-<br />
noble.<br />
tooter:me magnitica ■ <strong>de</strong> aluminato <strong>de</strong> litio e torso<br />
(Lira S-x Fe N 0 8' NO) es campo ■ magnitico ■ aplicado ■ <strong>de</strong> ati ISO kOs moseram a axis-<br />
ascii <strong>de</strong> cl <strong>de</strong> Fe cos ' gio antiferromagnitica e aleatoriamente dilei<br />
<strong>de</strong>s. Consi<strong>de</strong>rando ma :wrests:1cm <strong>de</strong> campo molecular i proposta um lei do tipo<br />
Curie-Weis ■ modificad ■ X-C/(T-6(T)). condi a "constante <strong>de</strong> Weiss" i fungal) <strong>de</strong> tom<br />
p aaaaa re Wm do " <strong>de</strong> ions es agi dos magoitices (xi ) a <strong>de</strong> <strong>de</strong><br />
Weiss (11) do simema magnitico pure (Litte 50a ). <strong>de</strong> forma 6(Z).x aST/(0(x-za )-AT).<br />
MAC/9:40/411.F<br />
IISTUDO EXPERIMENTAL DA FROMTEIRA DE PASS ANTIFERROMACNIITICA PRO<br />
!IMO A To NOS CONFOSTOS Ma(111. 1.1,Cl x ) 2 .4N20<br />
Westpbal.C.11.; A .C.C.e Faduen Filho A. - (I.F.U.S.F.).<br />
Iftendo a titmice <strong>de</strong> medi<strong>da</strong>s <strong>de</strong> ptibilicht<strong>de</strong> magnitica a bailees tem<br />
pm aaaaa memos <strong>de</strong>talbando a from aa aa antiferro - p aaaaa gnitica nom compostos<br />
mime. 0 objetive d enten<strong>de</strong>r o comportamento <strong>de</strong>lta frenteira cm a aaaaaaaa agio<br />
x ■ ■ possivel influinci ■ que os campos aleatirlos timbals ■ bre meanie.
NAG/10MI5/4A F<br />
EVIDENCIA DE ORDEN DE CURIO ALCANCE EM LIGAS<br />
INVAR Feld INDUZIDA POR ALTA PRESSAO<br />
N.R. Gallas, A. Vangues, L. Amaral, J.A.N. <strong>da</strong> Jos:Ra<strong>da</strong><br />
Mrr Ii ititito<strong>de</strong> <strong>Fisica</strong> <strong>da</strong><br />
Com o objetivo <strong>de</strong> estu<strong>da</strong>r a or<strong>de</strong>nacio scie Ilga ■ FeNi, investiga -<br />
mos o efeito <strong>de</strong> alto preSSao no espectr0 Kftsbauer <strong>de</strong> Fe em Ilgas FeNi sujeltaS<br />
a recoximentos por longoe periodos <strong>de</strong> tempo. As ligas estu<strong>da</strong><strong>da</strong>s estio na raga°<br />
Invar comconcentracaes <strong>de</strong> 30, 32,5 a 35 at AS do Ni. Oa tratamentos tarmlco ■ con-<br />
eistiram nun renfrlamonto a partir <strong>de</strong> 1000 -C on p - do 60 kbar e a preemie<br />
amblente. A taxa <strong>de</strong> resfriamento foi <strong>de</strong> -125°C/dia.<br />
Comparando -se os espectros <strong>de</strong>s llgas submsti<strong>da</strong>s a ester dole tra<br />
tamentos, observou-se nag amostras trata<strong>da</strong>s com prensio, um aumento no campo<br />
perfino,gue pods ser explicado por um aumento na_temperatura <strong>de</strong> Curie e/ou um au-<br />
mento no moment° magmatic°. Cm elated** <strong>de</strong> difracao <strong>de</strong> neutrons envolvend0 diferen<br />
tea tratamenton termicos, nota-se um aumento no campo hlperfino eon o parimetro<br />
do or<strong>de</strong>r do curto alcance. Nonana resultados sugerem entao, qua altar pressoes<br />
tan<strong>de</strong>m a aumentar a or<strong>de</strong>m do curto alcance nestas Limas e eventualmente, Indusir<br />
uma or<strong>de</strong>m <strong>de</strong> longo alcance.<br />
MAC/InIWAA r<br />
ORBERVACAO DE TRANIFICOMB ENTRE AS DIRICOIB DS NAONETIZACAO<br />
10011.(0101 IC 1100) IN FERRO-BILICIO OOM TEXTURA 1110)<br />
(001). ATRAVEB DI ESPECTROBCOPIA BARKBAUBEN<br />
Rubem L. Boomer. Job° X. Schmidt Flavio P. WA<br />
Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFROB<br />
Rol estu<strong>da</strong>do o comportamento do ocorrencie <strong>de</strong><br />
<strong>de</strong>scontinui<strong>da</strong><strong>da</strong>m na Neonstisaclio (Mite BarAhattean) em<br />
mostras <strong>de</strong> Fe-8i AlB1-115 am funclio do cameo aplicado. Para<br />
virloe Anaulom entre a direclo 1001) a et Moo aoliCadO.<br />
INAS PERMANENT'S DE TR-Fs-11 cam (1111) max . 1511C0s.<br />
Frank P.Miesell a Sergio A.Romero, Institute <strong>de</strong> <strong>Fisica</strong> -<br />
Fernando J.C.Lan<strong>da</strong>raf e Daniel [laicism's, Institute <strong>de</strong> Pesquisss<br />
Teesolagiess do gstado <strong>de</strong> Sso Paolo S.A.<br />
lea. permanent. ■ basted°. au rrrrr raras (TR) op m pre<strong>da</strong>tor' aner<br />
getirols (1111).ax el aaaaa s a silo coup 00000 es vitals em motors. e dispcoaitivos aletrinicos.<br />
0 prosrsels <strong>de</strong> <strong>de</strong>meneolvimento do tecnologia <strong>de</strong> Fabricitt <strong>de</strong> imam<br />
per oo * <strong>de</strong> Nd-Fe-11 atiliza tacnicas <strong>de</strong> metsIurgis do pi.partindo <strong>de</strong> nom li<br />
gm cam composici° (NdggDylA) iFe9211405 produeimo ■ iris isotripicos cam campo.<br />
coercive' inrri 00000 e B r i 10k0e. l.a. anielartgaico ■ foram produgidos ■ linhen<br />
do o pis coo um campo magnetic°. 0 melhor remultsdo 'Acid° 'san<strong>de</strong> a um pro-<br />
doto enerOlico IIIII/ sa, IS MI0e. 0 proceseu <strong>de</strong> fabricati° <strong>de</strong> imie person eeeee<br />
por metalurgia do pi ser ■ sp <strong>de</strong> cam resultsd<br />
Projeto patrocina<strong>da</strong> por : rINEP (PADCT), FAPISP a CNFq.
MAC/11'15/4A FIDETERMINACAO DO CRAU DE ALIMEAMENTO DOS CRAGS DE fMAS PERMANENTES<br />
DE Nd-Fe-B UTILIZANDO RA10-X.<br />
Volquiria Villas Boos Comes e Frank P.Missell.Instituto <strong>de</strong> Fieles<br />
- USP.<br />
0 compost° 1112Fo1gli <strong>de</strong>vido a sea eseepcional anisetropia uninxial per<br />
site a fabricacao <strong>de</strong> Imre permaneates cam altos esmpo coercive 8 e e produt;<br />
energitico (1111).. z . A quali<strong>da</strong><strong>de</strong> do imi <strong>de</strong>pends' diretamante do grau <strong>de</strong> alinbamen<br />
to dos particulas do ilea. Os galore& do produce anargitieo (88) max e <strong>da</strong> inducin<br />
rem B r lie dlretameote <strong>de</strong>pen<strong>de</strong>nt's do grau <strong>de</strong> alinhamento dos cc is-<br />
teis. 0 conhocimento do grau ds alinhamento nos permit, eomparar o valor do memento<br />
<strong>de</strong> coo Ms <strong>de</strong> um cccccc 'seal com o valor <strong>de</strong> M, pars um imi perm.:<br />
meats.<br />
Apresentamos um mitodo introdusido por Civord et al. qua <strong>de</strong>termine o<br />
valor midi° <strong>de</strong>sse grau <strong>de</strong> alinhamento. Esse mitodo involve um escudo quantitative<br />
<strong>da</strong> distribuigio esta c cc Lea do alinhamento doe grios, qua a obtido <strong>de</strong> aniline<br />
dos difratogramas <strong>de</strong> rain-X. Nile faremos s eomperseio <strong>da</strong>m i i<strong>da</strong><strong>de</strong> <strong>da</strong>l refl.:Ems<br />
<strong>de</strong> Bragg, pars diferente ■ valor.. <strong>de</strong> links. [hkl] Co. respeito so Unice,<br />
also cristalogrifice do [mi.<br />
0 grau <strong>de</strong> alinhamento obtido em isle MEOMAX 33, febricados por SUMITOMO,<br />
fel a 26 0 g 3° quo concords Co. os valor.. obtidos em medi<strong>de</strong>s utilizando ■<br />
teenlea <strong>de</strong> Sitter realica<strong>da</strong>s em nosso laboratiorio, ben como os resultado ■ obtidos<br />
por Civord et el. e DOrst et al.<br />
Patrocine<strong>de</strong>rea: FAPESP, FIRM COPq.<br />
MAc/11;35/AA.F1 "VISCOSIDADE MACNOTICA RN ImAs D8 Ild-711-8". Joie Carlos Cil Mar<br />
Frank P. Misaall - Institut° <strong>de</strong> <strong>Fisica</strong> - USP.<br />
VLecosi<strong>de</strong><strong>de</strong> magnetics i o none <strong>da</strong>do i mudsoca ass proprie<strong>da</strong><strong>de</strong>e magniti<br />
cam <strong>de</strong> um sistema so longo do tempo t, Logo <strong>de</strong>pois qua mudsmo ■ o sou gated;<br />
.<br />
sag . Para amo 00000 <strong>de</strong> Ild-Pe-B verifIcamos a va o i cc io d ■ magnatizacio obi<br />
<strong>da</strong>ce i Lei Al - S lo(t) Cte, on<strong>de</strong> S ■ l ira. kT/q sendo X. a suse ■ptibi<br />
. t rr<br />
li<strong>da</strong>d i 1 e q constant' coo relacao ao camp° !Oleo's° 8.<br />
Vamps spr 000000 r no mosso comunicacio uma 000 i o ao do teoria ■ basea<strong>da</strong> no<br />
principio <strong>de</strong> stivacio tirmica, ben comp um eonjunto eomplito <strong>de</strong> dodos tomsdod a<br />
T ■ 298K. Buses dodos is compas <strong>de</strong> medl<strong>da</strong>s <strong>de</strong> S <strong>da</strong> suseeptibili<strong>da</strong><strong>de</strong> pars va<br />
loses <strong>de</strong> comp° apLicado p 88 Intro -2T a OT. Como resultado final obtivamos<br />
qua kT/q m (8.3 - 0.3) z 10 T i temp b' . Esse resultado a tempo<br />
rival nom o obtido per K.D.Durst a H.Rronallar do Maz-Planck-Institut.<br />
Trabalko pa<br />
do palm FAPESP i PIREP (PADCT).
Awn01!110/5A1 IPROPRIEDADRS NAGNI(T/CAS DI PRIRITAS DILUIDAS.' P.H.Deminsuas. J.M.<br />
Nato s E. Nuamt-Inatitute <strong>de</strong> FEsica-UFRJ.<br />
Ferrite' e seta-ferrita ■ <strong>de</strong> lItie audio, magnetite rem<br />
madie vie prepared... re. ' gratis <strong>de</strong> dileigia pela_enbeCituigia do ion maga:<br />
tico par Al au Ca au pela dosages . <strong>de</strong> metel alraline. Sao °bei<strong>de</strong>' sistersa <strong>de</strong> baT<br />
■m mieetriem (glanares), quanto do ion magnitice, qua permit's situ<br />
<strong>de</strong>m <strong>da</strong>m inearagoes antiferremagnitica ■ Fe-Fe <strong>de</strong> clusters aleaterianente dilui<strong>de</strong>e.<br />
L55555 dos meranisoes <strong>de</strong> ear oo o 1 ago - ferries Inagestita/ - geatita ■mgrfa<br />
sip objeto <strong>de</strong> invamtigagaa.<br />
MAG/8:20/5A.F I ISM° DR ALMANDINAS NATURALS FOR 118118CTROICOPIA MOSISSAuSR. Joie<br />
Carlo. Parente <strong>de</strong> Oliveira (Department° <strong>de</strong> Visits - UFC) A<strong>da</strong>lberto Vasquez<br />
TWaTeR7-27-lealai-=-Vngs).<br />
Come parte integrant@ <strong>de</strong> urn trabalbe sabre silicates a 00000 is spresotasea<br />
e estudo experimental, per e 00000 reeeepi. Meembauer, di dues awe 00000 a ttttt is<br />
<strong>da</strong> solurie-solids Firepo-Alsandina (reillg l _ x ) 1411,(SiO4), Co. ..I x.0,4. Setae<br />
resultados sie ceepara<strong>de</strong>s ao ■ <strong>de</strong> uma smeetta saute]. <strong>da</strong> leIngio-adli<strong>da</strong> con ...0,8.<br />
Des espectres ebti<strong>de</strong>s a ■ ustas efatue<strong>de</strong>s a <strong>de</strong>pentlencia dos p - Mile-<br />
■bsuer cos temp rrrrrrr i ■nalioads: a <strong>de</strong>e<strong>de</strong>b to quadrupelar I in<strong>de</strong>pen<strong>de</strong>nts<br />
<strong>de</strong> temp . enq progressive era to magniptieo psra temperature<br />
■ &bal.° <strong>de</strong> 81. Iambim ebserva-a* quo or<strong>de</strong>namanto magnitiee <strong>da</strong> selegiosolids,<br />
em balsas temperatures, ViCia cam a rr agie x <strong>de</strong> Fe .<br />
MAG/8:40/511.F I DINAMICA CAOTICA DS MIDAS DC SPIN 3 EXPERISNCIAS CCM YIG. F16vio<br />
K. <strong>de</strong> Aquiar. Antonio Moved° e Sergio M. Rotondo. Departamento <strong>de</strong> Pleica. —ORPversi<strong>da</strong><strong>de</strong><br />
Fe<strong>de</strong>ral <strong>de</strong> Pernambuco.<br />
Bifurcacaes e coos em on<strong>da</strong>s <strong>de</strong> spin excita<strong>da</strong>s por microon<strong>da</strong>s 4-10GRO tan<br />
sido investigados per bombeamento paralelo D] no proms.° <strong>de</strong> Suhl <strong>de</strong> segun<strong>da</strong><br />
or<strong>de</strong>m Experiancies recentes em nosso laborat6rio mmamerimague site comportawent°<br />
tembem ocorre no process° <strong>de</strong> Suhl <strong>de</strong> prineire or<strong>de</strong>m. Atualmente estate=<br />
tentando observer o espelhament0 inelistico <strong>de</strong> luz (A.63288) por magnons excite-<br />
d°s per bonbeamento paralelo. Rite tecnica permits um estudo <strong>da</strong> variagio <strong>da</strong> pop.lac5o<br />
<strong>de</strong> co<strong>da</strong>s <strong>de</strong> spin con vetores <strong>de</strong> ends especIficoa em fungi° do campo <strong>de</strong> bonbeamento<br />
L3]. Nestes experiment°. memos amostras <strong>de</strong> YIG ('Yttrium Iron Garnet" -<br />
Y Fe 0 1. um ferromagneto prot6tipo.<br />
3 5 12<br />
[1] F.M. <strong>de</strong> Aguiar and S.M. Rezen<strong>de</strong>, Phys. Rev. Lett. 56, 1070 (1986).<br />
[2] G. Gibson and C. Jeffries. Phys. Rev. A 29, 811 41984/t S.M. Rescin<strong>de</strong>r O.F.A.<br />
Donflm and P.M. <strong>de</strong> Aguiar, Phys. Rev. 8 33, 5153<br />
Shang, Phys. Rev. Lett. 57. 1480 (1986).<br />
(198611 H. Suhl and X.Y.<br />
EX) W. wattling, M.D. Wilber, P. Woos and C.C. Patton. Phys. Rev. Lett. 51,<br />
1680 (1983).
NAG/9:00/511.F 1EPR DO ION re 3* E Kb EN Littbilt . J. P. AndreetaAIIII. NaseimentsLmis Henri<br />
gue_P. <strong>de</strong> Co<strong>de</strong>r...! H. C. Terrile. Institute <strong>de</strong> risks 'Nimes<br />
<strong>de</strong>-SiCir d os - U SP,leisse Postal<br />
369. -113157 - Sao Carlos, SP<br />
O Late, 4 um material lerroeletrico suite i Was sump protrie<strong>da</strong><strong>de</strong>r ffsieas e possibili<br />
<strong>da</strong><strong>de</strong>s <strong>de</strong> oplicagies pritieas. Uma <strong>de</strong>ws proprie<strong>da</strong><strong>de</strong>s, ■ mI<strong>da</strong>nga do iodine <strong>de</strong> refragio indusi<strong>da</strong><br />
otieamente, e um 'felt° in<strong>de</strong>sejado pars ■ lpines aplicagies (cities iotearsds) e conveniente pare<br />
outras (boloarafia). Esse fenomeno e atribuido i por<strong>de</strong> <strong>de</strong> ammo foto eseitados ma reeio iluml-<br />
ni<strong>de</strong> Inci<strong>de</strong>nce o efeito dm los sabre o espeetro <strong>de</strong> CPR do LiNb0 3, orienta<strong>de</strong>, nio estaquiomitrieo,<br />
ido em noun Labowatirio. Nemo mend° numinslmento puro, o @spectre <strong>de</strong> CNN metre ■ presence<br />
<strong>de</strong> Ire". Irradiando eom los dr em lamer do Nolte (2 WW) <strong>de</strong>ntro <strong>da</strong> covids<strong>da</strong> do aieroon<strong>da</strong>, pu<strong>de</strong>en.<br />
obter <strong>de</strong>pen<strong>de</strong>nci ■ du CCCCC imento <strong>de</strong> intelli<strong>da</strong><strong>de</strong> do 'sisal do 170 eon o tempo <strong>de</strong> irradisgio. Verilimos<br />
tambim a formagio <strong>de</strong> porim to quali ' amente.
CIENCIA DOS NATERIAIS/PROPRIEDADES MECAN/CAS<br />
Coord.:- Gilberto <strong>de</strong> H.Gualberto (UNICAmP)
NAT/300/4A F 1 MORFOLOGIA OE UMA MISTURA POLLMERO-METAL. R. yariesert. R.P. Mote<br />
A. %/fiche e M. A. R. <strong>de</strong> Maroon (Oopartemonto <strong>de</strong> Mlle's AplIca<strong>da</strong>. IFGW - Univerel<strong>da</strong><br />
<strong>de</strong> Estedual do Campinasr-<br />
Sari° dnacrltan tactilely's <strong>de</strong> ohtoogio do filmes finon por <strong>de</strong>rmalcao<br />
5 vacua. dm use mlature pollmero ■ motel. Foram utilized°. dots metal. dIstinto.:<br />
cobra a solidi°. No prImeiro caso, o metal fol Incorporado so'bolimere per um<br />
p 00000 so <strong>de</strong> 'sputtering'. co. a concomitants polimerizacao <strong>de</strong> mestileno. @trove ■<br />
<strong>de</strong> uma Masterse elitrica <strong>de</strong> corrupts continua no vapor do correspon<strong>de</strong>nt°<br />
No casco do palidlo. nue Incorporario se di por sublimecio tirmice simultan 00000 te<br />
pollmerizegio do acetileno am <strong>de</strong>scarga <strong>de</strong> radio-froguincle. Resultedos relatives<br />
h morfnlogles ran minturn torn nvIdonciadon por allcroncople olotrintcs <strong>de</strong> trarmalssip.<br />
OUsorvou-n ■ a pre:mega du lihao neteIloss diapurses no +nutria do pol[moro. am<br />
gumbos os cases. (FINEP. FAPESPI<br />
NAT/11:20/4A.F ERIN OA marglo uv LA MRCS RE TEFLON FEP<br />
Rehata Yashidm Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Amason..<br />
Netter N. dm Cunhe Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Plea<br />
Rene A. Mo no Wen !GCE . UMW - Campus <strong>de</strong> Rio Clara<br />
Ameetzes dm TeflOn FEP so<strong>da</strong>s con Opossum' covens s irredie<strong>de</strong>s cam lug UV an<br />
<strong>de</strong>m a sum cepeci<strong>de</strong><strong>de</strong>. <strong>de</strong> . rster dirges eletrices .e temperatures swims <strong>de</strong> ISO IC .<br />
Eve ■ comportseente ne2 s observed.. <strong>da</strong> forme tea scentus<strong>da</strong>..em smostres lire.<br />
dio<strong>de</strong>s previemente. Nee fei observed, fotacendutivi<strong>da</strong><strong>de</strong> UV temperstur ■ ambient..<br />
Nes experancies prelimineree Vol utilisf<strong>da</strong> use fonts <strong>de</strong> lux <strong>de</strong> As. a intrei<strong>de</strong><strong>de</strong><br />
<strong>de</strong> lux sobre . . swayers Vol <strong>de</strong> 13.S eV/em . 0 efeito nao soonest@ is uma lemime .d.<br />
vidre cosum s interpose. entre fonts <strong>de</strong> lora s emostre. Us resultmpe peelers°<br />
■er intsrpretedos 'upend° eltersgoas sic interface do cantata dm elvoinio ou por<br />
eltsrscoms no. p tree <strong>de</strong>s ermadilhass freguencie <strong>de</strong> 'seeps a Georgi ■ <strong>de</strong> ati-<br />
vacs°.<br />
A Disguise est; son<strong>de</strong> realised ■ no institute do Fisic ■ s (bailie& <strong>de</strong> S. Carle@ .<br />
USP no scup° <strong>de</strong> Eletretos.<br />
MAT/8:40/4A.F consvuucito E APLICACAO DE UMA CAMARA DE DIPRACAO DE RAIOS-X, A<br />
OULMTE, PARA 0 ESTUDO DA RELCAO ENTRE Nb-Ti s u 2 . Silvio Rainho Teixeira - WIMP<br />
Pros. Pru<strong>de</strong>ntc-SP; Cos5"do A. Rodrigues - UFSCar - DEMA - Sao CArlom-SP; Yvonne P<br />
Moscarenhas - rFOSC-USP-Sio CArica-SP;<br />
Com o objctivo do se eetu<strong>da</strong>r, do panto <strong>de</strong> vista estrutural, a reacao entre<br />
a liga e o gin nitrogaulo. In Situ. foi cOnstrui<strong>da</strong> uma anima <strong>de</strong> alto tempo<br />
ratura rare o difratamotro <strong>de</strong> raios-x <strong>da</strong> =SP - Presi<strong>de</strong>nt° Pru<strong>de</strong>nte. Como a tea<br />
cao entre o gig e o motel provoca altoracio nos oarimetrom <strong>de</strong> ro<strong>de</strong>. fortecio <strong>de</strong><br />
aolucau Boli<strong>de</strong>. e o apnrucimento<strong>de</strong> nowt' piece do elfraceo. <strong>de</strong>vido a precipita<br />
<strong>de</strong> novas Vases, conciniu-se gun so utilizendo <strong>de</strong>nim ticnica juntamente cnn u<br />
mo camera <strong>de</strong> mite tecpnratura po<strong>de</strong>r-se-la obten inEoruagoon sobra as mu<strong>da</strong>ncas es<br />
truturais quo ocnrrum cop o natal <strong>de</strong>ntro <strong>de</strong> urns camera <strong>de</strong> rescit entre gases e me<br />
tills. Alca dleso. em Late temperature 5 pi-nivel acompanhar dinamicamente tats<br />
reecaos obtendu-ac pas-Foot:1ns <strong>da</strong> cinatica <strong>de</strong> maga°.
NAT/9:00/4A.F DESEPHOLVINENTO OE UN RESERVATORIO DE NIOROGENIO. Germano Woehi Jr. e No<br />
<strong>de</strong> Castro Oliveira. Institute <strong>de</strong> Estudos Avancados/CTA- Sio Josi dos Campos-SP.<br />
S-ao diversas as /*Meats tecnoligicas <strong>de</strong> reservatorios <strong>de</strong> Iidroginio. Uma<br />
<strong>da</strong>s aoliceass i minter em equilibria a pressio <strong>de</strong> hidroginio molecular em 'thyratrons", uaa<br />
vilvula a gis, emprega<strong>da</strong> no chaysamento <strong>de</strong> circuitos eletrinicos <strong>de</strong> alta potincla e alto taxi<br />
<strong>de</strong> repeticio. Cos este finali<strong>da</strong><strong>de</strong> estamos <strong>de</strong>senvolvendo um reservatirio <strong>de</strong> hidreto <strong>de</strong> titinio.<br />
Este material apresenta uma estrutura intermediiria entre um compost° quimico e Imm soluao se; -<br />
lids, pois um' <strong>da</strong><strong>da</strong> massa do metal i caper <strong>de</strong> observer uma quenti<strong>da</strong><strong>de</strong> <strong>de</strong> hidroginio aciss 40<br />
miximo correspon<strong>de</strong>nts a anemia quTmica usual Till. A proprie<strong>da</strong><strong>de</strong> importante do hidreto <strong>de</strong> ti -<br />
tinio, na sua utilizacio em 'thyratrons", e a <strong>de</strong>pendincia <strong>de</strong> pressio <strong>de</strong> equilihrio do gis hidro<br />
genie cum a temperature. Nostramos esta <strong>de</strong>pen<strong>de</strong>ncia nos reservatirios <strong>de</strong>senvolvidos. Tamae se-<br />
ri° apresentados os processes utilizados no <strong>de</strong>senvolvimento dosses reservatirios.<br />
HAT/920/4A.F PEOCE DEFIMGRAVACAO DI faunae BM Si3a14". - E.L.Carpl,<br />
A.L.Gobbi, R.0.martimm - CF1D-TELEARAO.<br />
O objetivo <strong>de</strong>nte trabalho 6 otimixer o process° pare a obtengio <strong>de</strong> linhas<br />
fotograva<strong>da</strong>s utilLma<strong>da</strong>s na fabricacio <strong>de</strong> dispositivos semicondutores.<br />
O process° consists na <strong>de</strong>ponigio <strong>de</strong> um fotoresiste sabre um films <strong>de</strong> nitroto<br />
<strong>de</strong> silicio <strong>de</strong>posited° par PECVD, sobre ImP ou uma <strong>de</strong> suss ligas. A amostra 6<br />
dxpoeta a diferentes doses <strong>de</strong> radiegio ultra-violets a em sesui<strong>da</strong> 6 revelads em<br />
diferentee tempos. A influencia Bastes parimetros na <strong>de</strong>finigeo <strong>de</strong>s linhas sera<br />
anallea<strong>da</strong>. A transferincia do padrio geometric° pare a superficie do cristal 6<br />
felta removendo-se o Si3N4 por "plasma etching' oom diferentes potencies a tempos<br />
<strong>de</strong> ataque.<br />
NAT/9:40/44.P<br />
OTiAlfAce0 DE CAsOS SUPERCONOUTORES DE Nb 3Sn OSTIDOS PELO DETODO DA<br />
DIMAS LIQU1DA.<br />
Ourvel Rodrigues Jr. ,0altro Garcia finest' - UNICAMP, Institute <strong>de</strong> <strong>Fisica</strong><br />
Neste mitodo Ab e SnJ%Cu Cu sio nontIdon no estado puro d<br />
todo o process. <strong>de</strong> febrIcecio sew gualquer ttttt mento titmice intermedlirio<br />
a obtengio do Nb 3Sn i felts epos o enrolameato dos magnetos per difesio i tem<br />
peratures oldies - AgOn. 0 processo <strong>de</strong> dlfusio ileuI<strong>de</strong> tem <strong>da</strong><strong>da</strong> as abalones<br />
correntes crftIces e o entendlmento dos mecenIsmes <strong>de</strong> sprig. to <strong>de</strong> virti<br />
cos se Fax neeessirio levando-se so estudo <strong>da</strong>s teorles: clisslea <strong>de</strong> Hampshire<br />
e Taylor, ■ler ' p ice do Larkin-Ovehinlkov, coletiva <strong>de</strong> Brandt-Larkin-Ovchl-<br />
n ikov a ceorla <strong>de</strong> sprisionemento nes superfreies dos contornos <strong>de</strong> grios <strong>de</strong> -<br />
Nb 3 Sn <strong>de</strong> C, Zerweck.Aplicendo-se asses teorlas sera ?alto o eilculo <strong>da</strong>s for -<br />
gas <strong>de</strong> "pinning" no Nye' eom parimetros finals son<strong>de</strong> utilizados ne simulacio<br />
por eomputedores a na otimlzacio <strong>da</strong>s tempera t <strong>de</strong> fora:agile do Nb3Sn.
NAT/10'15/4A r ESTUDO 00 DIAGRAM Fa-Mb - Joni Miguel Feeley° s porgla Camp -<br />
0epartamsnto dm <strong>Fisica</strong> do Estado Sali<strong>da</strong> Clincla doe notarial' - Institute <strong>de</strong><br />
Fistce '61mB Watageln'- Univrsi<strong>de</strong>d. Estadual dm tampinam.<br />
0 diagram° <strong>de</strong> fess Fe-nb i estu<strong>de</strong>do emparimentelment ■ usando a tic<br />
nice mstelogrifIce do idontlflcacio <strong>de</strong> foams, facendo finalises oufmicas, alim<br />
dm elguns amtudos complementerss comp D.T.A. 560 praparedos parse dm dlfusemo Feb<br />
tratado ■ tormteaminto a temperature do 500, 1000, 1200 a 1300 C. Tumbim<br />
a:Amera<strong>da</strong>§ lige ■ am algumem eamposicoes @spiciness clue 00000 mplam a mistinela<br />
<strong>de</strong> alguma fogs intermadlirle. Om resultados dos pares do dlfusio. tent° <strong>de</strong>s anilisle<br />
laicals. coma <strong>de</strong> aniliiam <strong>de</strong> miarosson<strong>da</strong> alatronlea eumplamentados par @mi-<br />
lls.. D.T.A.. corroboram a oil ' is <strong>de</strong> use fess do carpoeldo Fu2Nb mesas tom<br />
. A fame Fe2Intil, pods tar ume false dm temper aaaaa @Natrona. dm acord;<br />
com resultados. A presence 00 fess .1 (Fe2Nb31 6 duvidosa a balsas temperatures.<br />
A esintincla do foss g iFol,Nby1 nip meth p1 tm estabeleci<strong>de</strong> minds. ds<br />
ter-se indiclos concretes ■ obre a existincim dusts fess a altos temperatures.<br />
ammemm....mmum<br />
NAT/10: 35/4A.F I EMIT° TEMA' NO EgFECTOD NOSSOAOSO OE Na3Fei I (Ca),,, NB 13020. J.R. <strong>de</strong> Arai-<br />
12. N.A.O.<strong>de</strong> 'raid° F.F.T. <strong>de</strong> Arid - Dept, dm FleIc<br />
Para um' font. <strong>de</strong> ems Unica Holm s um absorvador eau Na interagie quadrupolar, a aspeetro<br />
NOmmbauer con ' <strong>de</strong> <strong>da</strong>ms links. s a 0, as quits geralmmate tee, ne moo do un absolve -<br />
dor polierimtalino, mew iutemai<strong>da</strong>do. No enema anises= mum um qualm o absorvolor pelf -<br />
cristalino Nostra um direcio preferineial iimplie<strong>da</strong>do mum ammLumeria <strong>da</strong>m lining w a a. Tate Gioia<br />
do form nmo safeties <strong>da</strong>m particular qua emapiem a aammetra, sue po<strong>da</strong>m mar aloagadia (ago<br />
lbs.) ou mehaeadmm (plmeas) ■ or<strong>da</strong>in orientaeioaal do entae do ■linbiasate <strong>da</strong>is parefeulam<br />
es torno <strong>de</strong> urns direcao midis wino °corm eau pate°a sum visa. !amend° use <strong>da</strong>ta or<strong>de</strong>r arias-<br />
Miami (efeito tuatara), procure-se inferir ■ respite° do sins' do gradients do camp° sautes<br />
presents no micieo <strong>de</strong> Fe. Para iota .dote-se un mo<strong>da</strong>l° du<strong>de</strong> admits-se qua a 'radians dm ergo<br />
'little', tem um dimeribuieio erotica. A weir doses mo<strong>da</strong>l* tattoos-se curium tartan para s <strong>de</strong>-<br />
pend- ' <strong>da</strong> <strong>da</strong>m inteasi<strong>da</strong><strong>de</strong>s <strong>da</strong>m lianas a a o es (Iasi° do ingot° 6, goers a corral do<br />
piano <strong>da</strong> 'Nostra ■ radiagio Y. Couparagio entre resulted.. amparimaatats tearless asieraa<br />
use emeeleate eoncordineim pars ease and. eonsi<strong>de</strong>ra-se a gradients do camps positivo, soquanto<br />
quo no easo negative pa resultados diverges.<br />
HAF/10:55/4A.F TRANSFORMACRO DE FAZE EN CERAMICAS SOB mass paessals<br />
A.S. Pereira a J.A.H. do Jorna<strong>da</strong><br />
(Institute <strong>de</strong> <strong>Fisica</strong> dm UFROS - Porto Alegre - RS1<br />
HstA sendo reallzado um estudo sabre a influencia <strong>de</strong> <strong>de</strong>feitos na trans<br />
formac50 <strong>de</strong> fait: estrutural monoolinica/ortorrembica que a arceinia (1)03,) sofre<br />
sob pressio. A pressZo necessirla 6_gera<strong>da</strong> por rasa camera <strong>de</strong> alto pressi6 do tipo<br />
bigornas <strong>de</strong> diamante. A transformaTao 6 <strong>de</strong>tecta<strong>da</strong> pale observacio cos microscapio<br />
usando lug polarixa<strong>da</strong> a a pressio a medi<strong>da</strong> pela tecnica <strong>de</strong> fluorescencla do rubi.<br />
As amostraslmonocristals) foram sujeltas a diferentes tratamentose recd<br />
simento tirmico, irradlogio corn ratios gam. Irradlagio con 016trons a microin<strong>de</strong>ntagio.<br />
Os resultados ate agora parecem indlcar uma import/mole relevant. <strong>de</strong> campos<br />
<strong>de</strong> tangoes comp centros nucleadores a nio <strong>de</strong>ixam transparecer um eapel mercan<br />
to <strong>de</strong> movImentos <strong>de</strong> <strong>de</strong>slocacOes no process° <strong>de</strong> nucleacio . Eases sac rant°. biT<br />
sic°. nos dois principals mo<strong>de</strong>los existentes para o mocanismo <strong>de</strong> transigao e, -poi<br />
tanto, nooses resultados sio important.. par. a oompreensio <strong>de</strong>sea transformscio ,<br />
que 6 crucial na producio <strong>de</strong> materials ceramics). avancados.
MA1/11. 15/11A.FI CBRAMICAS PIEZOELETBICAS DE TITANATO-ZIRCONATO DE COMBO (PET): PREPARACAO E CA<br />
RACTERIZAC,A0. Bruno A.Plen Ducinei Garcia. Mari ■ Virginia Gain's°. Jose Antonio Eiras Jos;<br />
Alberto R.Jor<strong>da</strong>o Doportinento dn osyseai<strong>da</strong>di Fedora i <strong>de</strong> sao caricW:APT7-- 9<br />
As cerimicas piezoolatricas <strong>de</strong> Zi Titania* <strong>de</strong> Chusbn (PET) possuem mem estruture do<br />
tipo perovskits a sao as oais utilisa<strong>da</strong>s, atualmente. 02 aplicacies tecnolOgicas, <strong>de</strong>vido ao sou al<br />
to Eaton <strong>de</strong> acoplamento eletromecinico k (ramie entre ■ energia elitrica c eeeee ti<strong>de</strong> em energia me:<br />
cinics e viee-wersa) a sea alt. tempera -6;ra <strong>de</strong> Curie (acima <strong>de</strong> 350°C). Solugies ■Oli<strong>da</strong>m <strong>de</strong> Pb(Zr s<br />
Ti 1.ig)0 3 po<strong>de</strong>m ■er obti<strong>de</strong>s pare qualquer ratio Zr/Ti. Poi <strong>de</strong>senvolvi<strong>da</strong> a a<strong>de</strong>qus<strong>da</strong> ume infra-es-<br />
trutors que possibilita a prepsracio do po a <strong>de</strong> ducores piezoelitricos <strong>de</strong> PZT a pareir <strong>da</strong> old<br />
tura dos gui<strong>de</strong>s (PbO. TiO, a Zr0 2) cm salami* solids 0 P7T fel prepared° em composicOes prOximo ■<br />
a do eantorno <strong>de</strong> fuse mortotraplys tetragonal romboidriea (Zr/T1 e 1). Foram utiliaado ■ sonente<br />
Oxi<strong>de</strong>s nacionais e <strong>de</strong> puree' cemerciil. As 'metres e "sa<strong>da</strong>s (transdutores) foram poloriza<strong>da</strong>s<br />
e suss proprie<strong>da</strong><strong>de</strong>e riermele tt i t as estu<strong>da</strong><strong>da</strong>s a partir <strong>da</strong> media. <strong>da</strong> curve <strong>de</strong> transf em fungi°<br />
<strong>de</strong> fume- ' (meted° <strong>da</strong> resmonincia). Remultados prelioi eeeee 'iv compativeis coo os <strong>da</strong>dos<br />
enceotrados us 1 . . (FAPESP)<br />
maTill:WWF "ESTUDO DE PROPRIEDADES DIELETRICAS NA SOLUCAO SOLIDA SUBSTITUCIO<br />
NAL (Ba l _l Sr R ( TiO3." ( 6 ) Luis Robson Manic e !alter Meilen Po!<br />
tuschka Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> USP.<br />
Efeitos nas proprle<strong>da</strong><strong>de</strong>s fisicas do titanato <strong>de</strong> birio (BaTiO 3), em fungi° <strong>da</strong> pre-<br />
sence <strong>de</strong> titanato <strong>de</strong> estrancio (SrTiO 3), formando uma solugio solid. substitucional.<br />
foram estu<strong>da</strong>dos. Composicies com a firmula generica (Ba l _ OrdTiO3 . on<strong>de</strong><br />
0citc0.3. foram prepara<strong>da</strong>s e <strong>de</strong>vi<strong>da</strong>mente processa<strong>da</strong>s, obtendo capacitores cerimicos.<br />
Resulted*, <strong>de</strong> ■edi<strong>da</strong>s <strong>de</strong> constante dielitrica relative cr (1101z), fator <strong>de</strong><br />
per<strong>da</strong>s tga rigi<strong>de</strong>z dielAtrics, resistivi<strong>da</strong><strong>de</strong> a temperature <strong>de</strong> Curie sio apresen-<br />
tados e discutidos.<br />
Trabalho mantido pela FAPESP.<br />
MAT/11:55/AA.FI TRILRAMENTO ELITRICO 01 EPIDI E SILICONE. Susans Pereira Nunes, Cereldo R. <strong>de</strong><br />
Almei<strong>da</strong> (PIRELLI B/A.), Curt &Dormice, Mellon Vargas e Fernando Gals beck (UNICAMP).<br />
Polimero ■ isolentes, quando suhmetidos a Asa tensio, auto sujeitos i <strong>de</strong>grs -<br />
<strong>da</strong>sle por trilhameeto antrieo. Correntes <strong>de</strong> fugs na superfieie do material, cuja intensi<strong>da</strong><strong>de</strong> aumanta<br />
em presence <strong>de</strong> contsmlnantas, a a ocorrincia <strong>de</strong> <strong>de</strong>seargas entries" localisa<strong>da</strong>s po<strong>de</strong>m espor<br />
o Wiser° temperatures que levem i sus <strong>de</strong>composing termica, soma<strong>da</strong> aos efeitos <strong>de</strong> <strong>de</strong>gra<strong>da</strong>sio<br />
por bombar<strong>de</strong>io <strong>de</strong> elitrons. 0 perfil <strong>de</strong> temper aaaaa s a que sae submetidos materials largamente -<br />
utilizados ciao isolantes a borracha EPCM e a borrache <strong>de</strong> silicone - durante o tests <strong>de</strong> resistincia<br />
ao trilhamento eletrico (ASTM 2023) foi <strong>de</strong>termined°, filaando-os cos equipnmento eensivel I<br />
zodiac -ie. infraveraelha. Observou-se quo. durante a <strong>de</strong>gra<strong>da</strong>sio, Algeria! reeases do 1PDM atingem<br />
4R011C, valor pouco acima <strong>de</strong> sue temper t t ttt <strong>de</strong> <strong>de</strong>composicio, <strong>de</strong>termined. por DEC e PGA. Os produ -<br />
tom <strong>de</strong> <strong>de</strong>era<strong>da</strong>cio na superficie do polimero estio sendo investigado ■ per espectroscopia fotoacas -<br />
tic. na regiao do infravereelho priximo e, na regiiio fun<strong>da</strong>mental do infravermelho, per espectros -<br />
copia convencional <strong>de</strong> refletincia (MIR). Ma borracha <strong>de</strong> silicone <strong>de</strong>fra<strong>da</strong><strong>da</strong>, a evi<strong>de</strong>nte a dininuicio<br />
<strong>de</strong> intensi<strong>da</strong><strong>de</strong> <strong>de</strong>s bend.. <strong>de</strong> ■bsorsio a 1260 a 800 carfttensticam <strong>de</strong> ligacio Si-C113. Na<br />
borracha <strong>de</strong> EPEN, as ban<strong>da</strong>s a 2900, 2820 e 1455 cRl , correspon<strong>de</strong>ntes a ligasOes 0-M, diminuem <strong>de</strong><br />
intensi<strong>da</strong><strong>de</strong>. enquanto as ban<strong>da</strong>s na regiio <strong>de</strong> 1000 a 1100 aumentam sensivelmente. Pi evidin-<br />
cies <strong>da</strong> presence <strong>de</strong> aromiticos Apia a <strong>de</strong>gra<strong>da</strong>sio, cos aparecleento <strong>de</strong> bangles a 1600 e 1300 dill. -<br />
Tals evidincias são reforca<strong>da</strong>s cm o aumento <strong>de</strong> intensi<strong>da</strong><strong>de</strong> <strong>da</strong>s ban<strong>da</strong>s a 1,34, L,'5 a 2,14 pm, -<br />
<strong>de</strong>tecta<strong>da</strong>s no espectro fotoacUstico.
NAT/8:00/SA.F 1 PROPRIEDADES NECANICAS OE PIOUS OPTICAS, Ricardo Enrique MI:drone<br />
UNICANPIInntituto <strong>de</strong> Ffisles Blab Nategnin. Oeportemento <strong>de</strong> Mica<br />
Aplica<strong>de</strong>l<br />
Ums <strong>de</strong>s aaaaa teristicas male importantes <strong>da</strong> ■ Fibres Optics ■ i sues !roprie<strong>da</strong><strong>de</strong>s<br />
mecinimag. principelmento sue Rusietincia Moot:nice s a psistAnola..a Pedigo. A<br />
prim:ire sets relocionsdo cam a anietincla <strong>de</strong> trines. i a *nuncio ao cresolmonto<br />
lento dusts. trinces.<br />
Foram realized°, envision <strong>de</strong> track: em fibres cow veriagoes <strong>da</strong> Sava <strong>de</strong> tnsio14 or<br />
<strong>de</strong>ny <strong>de</strong> 'ren<strong>de</strong>rs). A pertir <strong>da</strong>ste ■ rosultados fol conotruA<strong>da</strong> a curve maitre do fa<br />
digs. qua permits :Astor cow baetonte prim:11910 a tonin Whims a sir subnoti<strong>da</strong>. pa<br />
✓e um tempo <strong>de</strong> vi<strong>de</strong> <strong>de</strong> 20 alma.<br />
Junto cow tato. foi enalles<strong>da</strong> a uniformi<strong>da</strong><strong>de</strong> <strong>de</strong> fibre num oomprimento <strong>de</strong> 3Km re<br />
chamedo ensile: <strong>de</strong> tensio <strong>de</strong> prove.<br />
NAT/11:20/SA.F 1 ACONULACAO Dl DUOS PRODUZIDOS PON FAD1GA COM CAXGA 'ABEAM. So-<br />
berto Pacosl F.:lamed° Henriques. Institute Kilitar <strong>de</strong> Rmgenhacia.<br />
No p trabalho tem-se realised° um eetudo ■ iAtemitico <strong>de</strong>s modllieaciea obier<br />
wadsi me superficie <strong>da</strong> corpos <strong>de</strong> prove <strong>de</strong> cobra letrolitico ■ submatidos a fadiga<br />
cos dif e s sequincia ■ <strong>de</strong> gement° aaaaa u-se facer uma correlagio ntr a<br />
e volucio dos <strong>da</strong>nce obmervedos on dssvioe do rsra <strong>de</strong> Miner obtidos 'experimental-<br />
sante.<br />
NAT/8:40/5A., rATRITO urrsuo IS K1CROSCOPIA ICLUSONICA DS TRANSKISSA0 1111 LIGAS DS 01,41-S e<br />
Nb -Ti -N. J. °dila Florincio - Vun<strong>da</strong>cio Universi<strong>da</strong>d Saadi:al <strong>de</strong> NeringitNal<br />
ter Jose Botta Filho, Jose <strong>de</strong> Antidote Rodrigues, Tomes I. William, Biroshi TjlmiCe Josi At -<br />
berto R. Jordio -Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Igo Carlos.<br />
Lige. do Mb-Ti En SOS p.<strong>de</strong> Ti), cam solutos i iciais. apresntaram picas do relasscio<br />
ascinica quo emtio send° estu<strong>da</strong>dos strove ■ <strong>de</strong> msdidss <strong>de</strong> atrito intern, utilisando pindulo <strong>de</strong><br />
torch invertido (tip. Ki).<br />
Nostra. contend° diferentes scores <strong>de</strong> hidroginio oc <strong>de</strong> nitroginio foram observed*. par mi<br />
croscopia aletranies do transmissio. Agwle. ems levados intersticiais. apressotaram<br />
confronts, <strong>de</strong> interface qua fore. associados a presence <strong>de</strong> precipitados <strong>de</strong> hidretos vu nitrates,<br />
provsvelmente ricos em Ti.<br />
Portant°. a combinscio d aaaaa dues ticnicas a 'accruements valioss no .etudo <strong>de</strong> elemontos<br />
intersticiais dissolvidos na metric e/ou precipltacio, quando 0 limits <strong>de</strong> ■olubilids<strong>de</strong> i atingi -<br />
do.<br />
Apoio: FINEP. NPq, a FTI/DNAR.
mkt/9*00/5A F ITENSiO NKCANICA E INSTAHLIOADES EN FILMES TINOS J. Scarminio.<br />
S. ma:hie:be. L.P. Cardoso a J.N. Sasaki - OMANI , - /FM<br />
Propie-se estudsr Maio meanies interne a sus torretacio cos em instabi<br />
li<strong>da</strong><strong>de</strong> ■ macinica ■ 'eva<strong>de</strong>s durants e/ou spa's o ccccc imeoto <strong>de</strong> filme ■ films.<br />
Pars ttttt foram ccccc idos filme ■ <strong>de</strong> Nb sobra Si menocrierlino mob diferan<br />
tee ticnicas coodigies <strong>de</strong> 'manta. gerando differences camas@ int ccccc . Oti<br />
Lisa:I<strong>da</strong> diffrecia <strong>de</strong> raio-I (mapeamento do imolai° <strong>de</strong> Brass tom um. timer ■ <strong>de</strong> Lans) ■<br />
■ <strong>de</strong> dos substrata. <strong>de</strong> Ill. a pertir <strong>da</strong>m gusts sic esleu<br />
media-se os raio<br />
lads. as cccc ee lateral:8 dos filmes.<br />
verificou-se tambim quo com a bidroaenagio pods-se atonic <strong>de</strong> forma<br />
lads ■ tensio interne (Mates Eileen. po<strong>de</strong>ndo .elms <strong>de</strong> coodlgass critic. ■ do Len -<br />
sio a<strong>da</strong>gio., lostabili<strong>da</strong><strong>de</strong>s micioicas dos tip° ■ flambesens e trincas.<br />
Projeto parcialmente flusnciedo pals TAPES?<br />
NAT/9:20/311J I MOO SO INVIIKKCIIIIN70 00 ACO 304 POI NElO DA ISCS1CA DO AS1170<br />
L.F.C.P. <strong>de</strong> Lima (IPIN-CNIN/SP),P.E.V. <strong>de</strong> Miran<strong>da</strong> a M.S. Mintairo (COPPS-UMW)<br />
0 esCo<strong>de</strong> do eseelbeeimento du entails <strong>de</strong> estreturs cubits <strong>de</strong> corps contrado, cintundo impure<br />
rasa. in idols e <strong>de</strong>formados plastleamsate, tun eldwrealimmdontillaando-se, entre antra'. ■<br />
ciente.' do mita iaterno. Kara titnica mostromroe ancients pots ransegua evi<strong>de</strong>misr a hams-<br />
gip entre &<strong>de</strong>ltas a discordincLas, qua tem um papal importunes ens proprie<strong>de</strong><strong>da</strong>s meanies@<br />
doings metals.<br />
No presence trsbalbe o metal estu<strong>da</strong>do i to ago imosidivel sustanitieo tips AISI 30d. As ms-<br />
di<strong>da</strong>s <strong>de</strong> ■trito interne foram reslisa<strong>da</strong>s ■ baisa frequimis nom intervals <strong>de</strong> temps <strong>de</strong> 120<br />
a 3731. Os 'spectres do strito intern e <strong>de</strong> frequineis en fuocie <strong>da</strong> temperaturs form obtidos em<br />
amostrae submeti<strong>da</strong>s a tratassetos terme-mseinlcos ampeciffeea. A <strong>de</strong>formagio plistica i temperate<br />
rio ambience a e 5231, tents em torgio cam em Iraqi°, i respamieel pets apareclueoto <strong>de</strong> om plc.<br />
lacunae a 2601 (Illa). cuje magnitu<strong>de</strong> i <strong>de</strong>peo<strong>de</strong>nte <strong>da</strong> quanti<strong>da</strong><strong>de</strong> <strong>de</strong> <strong>de</strong>formgio. e <strong>de</strong> one superpo-<br />
sigie <strong>de</strong> picas entre 300 a 4001. A obtengio dos @spectres apio <strong>de</strong>formacio plistica I temperature<br />
die 771 i prejudieo<strong>da</strong> pole esistimi <strong>de</strong> um alto emertecimanto priximo a temperature ambiente.pja<br />
ambiance <strong>de</strong>terrents <strong>de</strong> ume transformegio <strong>de</strong> Lass.<br />
rAT/9:40/5A.F<br />
MOBILIDADE TERMICA DE DISCORDANCIAS BM Si NONOCRISTALIND<br />
.0"<br />
V.R. Bunke, - A.R. Jureic P.C. Serbana l Departamento do <strong>Fisica</strong>/MR<br />
Serio apreaantados a discutidos alquns resultados preliminares <strong>de</strong> obsaripscoos fei<br />
tam em cristais do Si <strong>de</strong>formados plisticamente a ■ubmatidos a tratamento termico<br />
prolonga<strong>da</strong>. (900°C), too40h, Actinic). As <strong>de</strong>formac6as foram felta ■ radiants im -<br />
prosaic con ponta <strong>de</strong> diamante em amostras nanti<strong>da</strong>s a 9000C, em p ca do ar.<br />
Radiants revelacio per ataque quinico prods-se aconpanhar o movimento dos "loops"<br />
<strong>de</strong> discordincia ■ afastando-se <strong>da</strong> map <strong>de</strong>forma<strong>da</strong> e <strong>de</strong>pcia ccalescando. A fraca<br />
reprodutibili<strong>da</strong><strong>de</strong> qua se obeerva pads ter comp cause a difueio <strong>de</strong> oxiginio junto<br />
i superfIcia durante a impressio.<br />
Apoio CNN e PiNEP.
MAT/10215/1A ■ PONNACAO DC ESTADTONAS Tiro 'RIDGE', 'HIRAI B RAMA<br />
DISPOSITIVOS OPTORLETRONICOS - R.L.Carmi. R.G.Pereira, W.<strong>de</strong> Carvalho Jr. -<br />
Chlit-TELEIRAS.<br />
Nests trabalho apresentamos no estudo pare a obtenglo <strong>de</strong> microsestruturas<br />
<strong>de</strong> inters... em optoeletranica em inP e suss ligas por atague liquido °vet<br />
etching. As estruturas °bel<strong>da</strong>m <strong>de</strong>pen<strong>de</strong>m do piano crietalino. As geometria,<br />
<strong>de</strong> cads estrutura apresenta<strong>da</strong> sio bastante diversas. As do tipo 'RIDGE' re -<br />
guerem para<strong>de</strong>s verticals o as do tipo "NESIO, curvatures soaves. Ratio sendo<br />
estudsdos diversos parimetros quo afetem as mac/Sem i teas comps temparaturs,<br />
iluminagio, stress superficial e dilulcio.<br />
NAT/1p*35/5RJ'<br />
DETERHINSCAO DOS EPEITOS INDOZIDOS PSLO HIDROCENIO EM *cos INOXIDAVEIS. .<br />
Alvaro Saavedra a Sergio P. <strong>de</strong> Oliveira<br />
Sea', <strong>de</strong> Engenhari ■ e Ciincia dos <strong>Materia</strong>ls<br />
Institute MMus <strong>de</strong> Engenharia - Rio <strong>de</strong> Janeiro<br />
A microestrutura do aco inoxi<strong>da</strong>vel austenitico tem forte ihfluincia<br />
nos efeitos induzidos polo hidroginio. Um acampanhamento dosses efeitos por<br />
ticnicas <strong>de</strong> 'Mimic <strong>de</strong> rains-r, Nostra quo apsnas os picas <strong>de</strong> difracio <strong>da</strong><br />
Ease martensita alfe nio muds, <strong>de</strong> forma duranto a <strong>de</strong>sgaseificacio, mastrando<br />
quo esta Ease nio scars diatomic's causs<strong>da</strong>s polo hidroginio messes condielies.<br />
Nunn 'utilise do perfil <strong>da</strong> linha <strong>de</strong> difracio po<strong>de</strong>-se Nadir a varlacio do tamsnho<br />
<strong>da</strong> porticul ■ e observou-se quo o gran do <strong>de</strong>formagio nos smostras quo foram<br />
previamente lamina<strong>da</strong>s i sempre motor do quo nos smostras spools recozi<strong>da</strong>s e<br />
as previamente sensitiza<strong>da</strong>s. A micro<strong>de</strong>formacio <strong>da</strong> reds dos smostras lamina<strong>da</strong>s<br />
tssebim molar mai recupera-se rapi<strong>da</strong>mente au; niveis comparaveis cam a reco-<br />
zi<strong>da</strong> a a sensitiza<strong>da</strong>.<br />
NnT/10:5,/5A.F EFEITO DD HIDMODENIO DI pRocunis ESNatTADOS, Mach Silva dos Santos e Paulo<br />
Emilio Valadlo <strong>de</strong> miran<strong>da</strong>, EOPPEAFFU<br />
Is <strong>de</strong>bit= quo °corm frequents ante nos produtos esmaltados, a 'scams <strong>de</strong> Rive tee si<strong>de</strong> o eels<br />
preocupante pars os esmaltadores. Este <strong>de</strong>feito acorre strives <strong>da</strong> acumulaclio do Iddroginio no<br />
Interface total-emit, causes do lases semicirculares por tone produto emnaltado.<br />
ume dos moneires cue so pods evitar este <strong>de</strong>felto, nos produtns esmaltados, e mauls um@ microestruture<br />
rlca em attics sprisionadores, mat vsnha aprisionar o hidroairtio protlinico <strong>de</strong> me<br />
forma irreversivel nal temperatures <strong>de</strong> gum do esmalte.
MST /11/15/5R .F RESPOSTA. EM CALULA INGE. DO ALCOOL CARBURANTE A DIFERENTE8<br />
HIDRATACC3103. 508 ESTIMULO DE CORRENTE ALTERNADA FRACA, NA CANA DE FREQUENCIAS<br />
5 Hz a 550 Ha - 0.N. <strong>de</strong> Souza. A.L. <strong>de</strong> Oliveira, 0. <strong>de</strong> 0. Damaseeno e J. <strong>de</strong> Oliveira<br />
0 aptuelho <strong>de</strong> medi<strong>de</strong>s utilizado rot in lape<strong>da</strong>rchretro vet/aria 11 1-48005. HUMaros, ca o Mlula<br />
<strong>de</strong> modi<strong>da</strong>s. in espeettor irmt <strong>da</strong> geometria ellindrica e con es seguintes climmmiee: h . al<br />
bats (11.12 0.01) cm; a <strong>da</strong> para<strong>de</strong> extema do ellindra intern, . (2,28 - 0,01) m ;<br />
b rah, <strong>da</strong> para<strong>de</strong> interval do eiliniro externs ■ (2.40 = 0.01) cm.<br />
Flamm eueessivamente sodi<strong>de</strong>a cm as aegantes emstras: ABC 1(0.8075), 2(0,8194). 3(0.8450),<br />
4(0,8692). 5(0,8927), 6(0,9155). 7(0.93611), 8(0,9555), 9(0.9704), 10(0,9836). H 2 0(0,9950). AMC<br />
eigniftea i<strong>de</strong>col calico hidratado eariarrmie (mantras 1 a 10). A wears 1 e <strong>de</strong> &Drool eartomite<br />
coin se ecaprou <strong>de</strong> Lin romeeedor. A els ajuntarma-se qumti<strong>da</strong><strong>de</strong>s ereseentes <strong>de</strong> egua bi<strong>de</strong>s<br />
Ma<strong>de</strong> (mostras 2 a 10). A Ultima medlds fa felts con Mus bi<strong>de</strong>stila<strong>da</strong> para.<br />
Os diagrams <strong>de</strong> Cole-Cole obtldos ;ermitiram evi<strong>de</strong>nciar renamme Interfaclals a volureirleas<br />
Lb aproftr<strong>de</strong>rento no estudo do emitter eorrosivo d s solmams m sera possivel<br />
equips:mentos qua nos permits= trabalhar a frequenelas boo mats balsas que as uti<br />
liaa<strong>da</strong>s. Foram <strong>da</strong>terraina<strong>da</strong>s frequineiss cerseteristiess <strong>de</strong> relaxmaa a eonstan- 7<br />
H117/11:35/5A.F<br />
FILM FINDS DE POLTMERO CON INCORPORhCAO DE snACIO<br />
A. ViLeits. R. P. Hata. R. Parlseari a M.A. eica <strong>de</strong> Norms<br />
IF611 - UNICANP Campinss - C.P. 6165 Campinas 8.P.<br />
Filmes fins <strong>de</strong> polimero tom incorporacio<strong>de</strong> silicio foram<br />
fsitos usando a titmice combina<strong>da</strong> <strong>de</strong> Mescarga luminescente (par, a<br />
formacio do polimero a partir do acetilenol a sublimacio do silIcio<br />
(usandm umfilemento <strong>de</strong> t1). Os resultadoe <strong>de</strong>s medlcoes <strong>da</strong> condutivi<strong>da</strong><strong>de</strong><br />
elitrica as funcio <strong>da</strong> temperature sio mostrados, assim.como a microestrutura<br />
<strong>de</strong>stes filmes atravis <strong>de</strong> Nivroscopfa Eletrinica;<br />
mAT/11:55/56.0 SUITOR OA 111PLANTACX0 00 ii RN FOTORESISTES, Renato Gui - ■<br />
Livia A I. Nola Ln214E, Joel P. <strong>de</strong> Sousa e F C. Zavisia-TIWTTFtico<br />
do<strong>Fisica</strong> di U A i AAA si<strong>da</strong><strong>de</strong> Te<strong>de</strong>rmi do.liS).<br />
LIE too ■o.eri-implantado es polimeras f tate' di prises ■ quebras <strong>de</strong><br />
lisssoes quimicas. Os :tombs. Hares, se recoebinam, f do molecule ■ g<br />
qua sio libers<strong>da</strong> ■ atravio ds superfteie. 1<br />
A Fortis dm ouperacie ail a resat) <strong>de</strong> similar) at do too inci<strong>de</strong>nce, i<br />
forms<strong>da</strong> usa tumid., rica ea carbons, coo proprie<strong>da</strong><strong>de</strong>o (totems e gutmicss, difs<strong>da</strong>m<br />
proprie<strong>da</strong><strong>de</strong> ■ ceractertoticas do pollees° original. 2<br />
A implaotsgia do Si no focoresistes AMA, eels wooers que, es cooparacio<br />
so pollees° original, eats camadArica em carbons i Baia sesi nnnnnn a teaperatu<br />
ra, a tee wooer difusibili<strong>da</strong><strong>de</strong> pars o Ili que o Foliage° Atill.<br />
I Veakatesa ■ T. - Nuclear Instruments and Methods in Physic. Research<br />
117,8 (1985) 461.<br />
R.J. mad Huffman. C. - Nuclear Jost nnnnn to and Methods in Physics<br />
h 117/8 (1983) 501. .<br />
tea dieletrican do AEHC em funqao <strong>da</strong> hidratageo.
HAT/8:00/6A.F NEDIDA FOTOACOSTICA DA DIFUSIVIDADE TUNICA D8 MATERIALS TRANS-<br />
PARENTIS: PoLltmos. M.F.Leite(FEG/UNISP), N.Cella, M.Vergas (1.F(sics-UNICAMP).<br />
L.C.M.Niran<strong>da</strong> (INPE/NCT).<br />
Neste irabalho sere mostrado qua o mitodo <strong>de</strong>s difference <strong>de</strong> false antra a ilumine-<br />
qio diantetrm pars a nedi<strong>da</strong> <strong>de</strong> difusivi<strong>da</strong><strong>de</strong> tirmica <strong>de</strong> polimeros corn<br />
amp sssss am do or<strong>de</strong>m <strong>de</strong> 200tem a aplicado memento um intarvolo limitado <strong>de</strong> fre-<br />
q.:esti' abiso <strong>de</strong> 1211a. Para amt.. amo sssss 00000 ismo dominant. pars !sequin-<br />
cia ■ no interval° <strong>de</strong> 10 e 10011a e p Lento <strong>de</strong> proeseaos termalisticoa. Nie-<br />
ce ciao a difusivi<strong>da</strong><strong>de</strong> tarmic ■ pod. see untie obti<strong>da</strong> a weir <strong>de</strong>s <strong>de</strong>pen<strong>de</strong>ncia<br />
com a frequincia <strong>de</strong>s fame dianteira do ■ ina' fot 000 G oo ice.<br />
Este meted° foi aplicsdo com iaito ea polletileno <strong>de</strong> baize <strong>de</strong>nsi<strong>da</strong><strong>de</strong> a teflon,<br />
@ammo. eaten<strong>de</strong>ndo-o ■ Dairies materiaim.<br />
NAT/8:20/6A.F AVALIA00 DA ESPESSURA DE FILMES FINDS SEMICONDUTORES DE Nb205 E<br />
fa2u, von CAP CITANCiA DIFERENCIAL - J.F.JULIAO (Depto. <strong>de</strong> Frsice, UFC).<br />
MES (OFTE, UFRN) 0.G.PINATTI (InstararliYrslcm <strong>de</strong>s UNICAMP e F.T.I.).<br />
Medl<strong>da</strong>s <strong>de</strong> cepecItincia differential palm ticnIta <strong>de</strong> C-V Eletroquinelco foram efetira<strong>de</strong>s<br />
em filmes <strong>de</strong> pentaxido <strong>de</strong> Nioblo. 111,20g e pentoxido <strong>de</strong> tintalo, Togas<br />
crescido ■ par ■nodizagio nuns solucio eletrolitlee <strong>de</strong> N)P0A. It noma temperetura<br />
<strong>de</strong> UPC. As medi<strong>da</strong>s foram feltas nos mesas, candled. ■ <strong>de</strong> formagio dos filmes. Os<br />
resulted°, mostram qua espessura <strong>de</strong> co<strong>da</strong> films, evalla<strong>da</strong> pale quantl<strong>da</strong><strong>de</strong> <strong>de</strong><br />
cargo qua passa no circuit° extern du proem's° <strong>de</strong> enodiasgio coinci<strong>de</strong> '<br />
tom o valor <strong>de</strong> larger' padrio <strong>de</strong> Dern <strong>de</strong> caned especial <strong>de</strong> carps, do films semieondutor.<br />
avalisdo a partlr <strong>de</strong> grificos Mott-Schottky. (FIPEC/CNPq).<br />
maTii:SOFSA.F SSPECTROSCOPIA.VOTOACOSTICA OON HALOS it onscio CON COMA ABU-<br />
TS. Nanool Marcos Praire d'Oular Nato. (Institute <strong>de</strong> <strong>Fisica</strong> dm N.Vareme<br />
(Institute <strong>de</strong> <strong>Fisica</strong> die Selassie) e L.C.N.Diran<strong>da</strong> (Inatitnto do Peaquipee !impact-<br />
■im).<br />
O efelto I 00000 ragtime (fototirmico) pods per ■plicado em goal:per regiio do espec<br />
tro eletromagnitico a is valor I foram usados come disgio. Numa cilela insert& os<br />
rages I :PTAs absorvido ■ per use amour. <strong>de</strong> chests° com eepessura <strong>de</strong> SOum qua ere a<br />
pripri ■ jangle <strong>de</strong>s cilnla. Com gerador operated. a 45RIP Co. lila correlate <strong>de</strong> 110mA<br />
fel anellea<strong>da</strong> a ariagie do ain't f ico cos a frequincia do medulacio <strong>de</strong> rp<br />
diagio. Perm estu<strong>da</strong>r a Tempests <strong>de</strong>s cilula ■ a i i<strong>de</strong><strong>de</strong> do foie., a corrente<br />
foi varia<strong>da</strong> e urns <strong>da</strong><strong>da</strong> frequincia <strong>de</strong> modulagio. Praia:e<strong>da</strong>m.. werificar a peasibili<br />
<strong>da</strong><strong>de</strong>.<strong>de</strong> utilialegio do sited° no @stud° <strong>da</strong> ■ 00000 igiee estruturais <strong>de</strong> Ease.
NAT/13:40/6A.F I NE0100 OE RUGOSIDADE POR CORRELACRO POTOGRAFICA SIMUCTANEA<br />
J. J. Lunaza..M.S.:Stohl Re<strong>de</strong>em°. N.G.. Gegsloll. E.N. Heger! Institut° Neelonel <strong>de</strong> Toon° -<br />
Tairammuial INTI Argentina<br />
A ticnIca <strong>de</strong>-corrolscio fotogrifica 'Inuit/kiss Isuparposicia do fairs lumina.° o sou negstivo<br />
fotogrifico. coletan<strong>da</strong>so a luz no dmtentoil fol-aplica<strong>da</strong> pals oilman vas ao toss <strong>de</strong><br />
malign dm regasi<strong>da</strong>do <strong>da</strong>Superficies. Trots-ss <strong>de</strong> auporficies <strong>de</strong>spoli<strong>da</strong>s aloatorlaments and,<br />
corrlacio M midl<strong>de</strong> conforem-vii son<strong>de</strong> ai<strong>da</strong>do o ingulo <strong>de</strong> Incidincle..Obtivoramse cleats manoire<br />
resultados quo pars-item Maar a disperse° stan<strong>da</strong>rd do valor <strong>de</strong>s rugosi<strong>da</strong><strong>de</strong> IN.M.S.) no<br />
campo.di valorms do 1.30mm. 0 mistime results mots samples, compacts o conflavel quo as.proam<br />
<strong>de</strong>ntin. son<strong>de</strong>-tango multo male berates semi' d reproduzir qua om mum operas par samara:an<br />
to macialca. pernItIndo inclusive sua aplicallo so reap dm notarial. brandos. Om rasultados<br />
ti<strong>da</strong>l onamajammos pare Conga novas salmons ticnicas quo aumentma a performance do Instru<br />
mint°.<br />
NA1/9:00/6A.F I CARACTERIZACIO DB C2L1lLAS TOTOVOLTAICAS USANDO ESPECTSOSCOPIA DE<br />
DZIPLISLIOVOTOTIMMICA( IMMO mum = N.L.Riottm (ICAv-GTA - S.J.dos Campos) ■ L.C.N.<br />
Miran<strong>da</strong> - CP. S1S - S.J.do ■ Campos), - li.Varame (ITOW-UNICANT).<br />
Seri sp aaaaa tad. ass <strong>de</strong> asps cccccc opia fototirmic ■ dm <strong>de</strong>flexio pars a carseteri-<br />
eagle <strong>de</strong> eilulas fotovoitsica ■ ■am cantata. Eats cicala' 6 capes <strong>de</strong> f<br />
sistincia <strong>de</strong> carsa i<strong>de</strong>al a a encl.:0°1a quimtics bee coma a valor dm resistiacia<br />
interns en saris <strong>da</strong> pilule. Musa comparasio cam entre. amok's' fototirmicas tamleim<br />
sera discoti<strong>da</strong>.<br />
ssr<br />
maljjaav ii<br />
AMAMI<br />
.ICARACTERIZACAD ULTRASONICA 00 QUARTZ° E MATERIAIS CRIPTOCRISTALINDS Armand()<br />
Idski Shinolmra. Orison Torikal a Carlos R. Suzuki (Inatituto dm Ffolca<br />
a presents rated°. string ■ <strong>de</strong> tamale ultressintco atilizando a mitodo pulso ■sco a torgeratura anr<br />
<strong>da</strong>nt.. fator cm atenuacio fat mediao era a froquincie na fairs dm 10 a 00nNz em 1 aaaaa <strong>de</strong> quartzr<br />
gradua<strong>de</strong>s dm to a 4 5 nor lawmen visual a nos quartzes sintitico selocionados. Nos materials<br />
criptocristelinas classIficados gm Fibromas limits. ;nix. sardo. etc) ■ granularosIsfles, jams,<br />
lac) foram msdi<strong>da</strong>s as.voloci<strong>da</strong>ds <strong>de</strong> Prapagacio <strong>de</strong> comas intestines dm ma<strong>da</strong>m longitudinal a transver<br />
sal com a froquincla do iOnNz.<br />
Vas lances dm quartz° prevenient, Ca duos Jazi<strong>da</strong>s a fator do otsnuacia fol nedido no diracio prixi-<br />
sa a Z do also cristalino con a frquincia <strong>de</strong> 10Miz. Observau -am use correlaceo entre a groduacio.<br />
o o respective fakir dm atenuagio. Nos quartzes mintfitico o estudo do Welt° di laments a <strong>da</strong>m inclusies<br />
no fator do otanuacio fat mall:ado no direcho 1 do 01.0 cristallno com s frequincia ne fat<br />
ma do-10 a 90/111z pars 0 modo longitudinal con a froquincle <strong>de</strong> lOnnz pars o mo<strong>de</strong> transversal. 00g<br />
<strong>da</strong><strong>da</strong>, obtidos verlflcou -so QUO o fator <strong>de</strong> atonuogeo pars andos olisticas transversal i Influsncle -<br />
la pole asmonte antratanto este aloha nee acorn pare as inollisko.<br />
No ostudo ft materials criptocristelinos utilizando ma amostras dm igata malex as constants. olio-<br />
tires fun<strong>da</strong>mentels C11. C12 a C44 foram calcula<strong>de</strong>s utIllzando as vslimi<strong>da</strong><strong>de</strong>s <strong>de</strong> omegas/to e a <strong>de</strong>n<br />
illicit", do material. Os mOdulos do Bulk s <strong>de</strong> Ciselhamonlo obtfdos exporlmentalnante for corrola -<br />
: icman cam as valor.. tsarinas a on valorem oxporimontolo montroram-on pr5xlmos eon voloros to5r1<br />
.loo. Os valour do rotor dm anisotrople nadi<strong>da</strong>s mostrarao-se molars' quo 1.1 . (JICA. ABC -Ktal.<br />
2APESPI<br />
— .
HEMS E LIGAS<br />
Coord.:- Josh D'Albuquerque a Castro (uFF)
MET/11:00/4S.f 1 FUNCOES DE GREEN PARA REDES DE VALiNCIA INTELREDIAMIA.<br />
Gerardo Martinez a Mario E. Foglio, Instituto <strong>de</strong> <strong>Fisica</strong> 101eb<br />
116Eagnin- , universi<strong>da</strong><strong>de</strong> Estadual <strong>de</strong> 0:animas, C.P. 6165,<br />
Campinas, SP, CEP 13081.<br />
Um meted° pima tratar cam es operadoros <strong>de</strong> Hubbard gee aparecem em valincia<br />
intermediiria ji tem lido discutido peloe autores num <strong>Encontro</strong> anterior (11.<br />
N6 ■ tams extendido agora easa tecnica ao calculo <strong>de</strong>s funcaes <strong>de</strong> Green no<br />
espaco <strong>de</strong> momentum e fregulincias imaginariae (Natsubara). 0 tratamento inclue<br />
as interacoes entre eltios <strong>da</strong> redo a permits tratar ions com <strong>de</strong>ganeresancia<br />
orbital, aplicAvel portanto a compostos <strong>de</strong> terras rases. Como Arsenal° aorssen<br />
tame o calculo <strong>de</strong>stae func6ea <strong>de</strong> Green pare o mo<strong>de</strong>lo <strong>de</strong> An<strong>de</strong>rson perifolico<br />
com U infinite. Neste case, tomes somado infinite@ diagramas do tipo mail<br />
simples possIvel, a achado efeitos <strong>de</strong> mites corpos nas energies <strong>de</strong> gum/ -<br />
particulas. Os nooses resultadoe coinci<strong>de</strong>m com os qua Howson (2) tem piallemb,<br />
embora, sem <strong>de</strong>mostragio. Uma discuseao <strong>da</strong> extensao <strong>de</strong>stes resultados pare<br />
sistemas com uma <strong>de</strong>generescincia maior quo a <strong>de</strong> An<strong>de</strong>rson, assim come tambom<br />
a inclusio <strong>de</strong> diagramas maim complexes na tooria. sera apresenta<strong>da</strong> nests<br />
<strong>Encontro</strong>.<br />
(1) G. Martinez a N. B. roglio, IX <strong>Encontro</strong> <strong>Nacional</strong> <strong>de</strong> Pisica <strong>da</strong> Nat6ria<br />
Con<strong>de</strong>nea<strong>da</strong>, Pogos <strong>de</strong> Cal<strong>da</strong>s, MG, Abril 1986 (Comunicacio NET-051.<br />
(21 A. C. Hewson, J. Phys. C 10 4173 (1977).<br />
HET/8120/4A F I SST= DE UNA tiCMICA PER7URBATIVA CON IBI MODEL° EXATANIOCIR BOLOVZL. Ana Maria<br />
Rodrigues e Mario Z. Mille, Institute do Place. UnICAMP ■ Giftless, S.P.<br />
Os dioramas <strong>de</strong> Goldstone tem ai<strong>de</strong> used'sa per virlos sutures ") pars celeular a fungi° do par<br />
tiCia <strong>de</strong> ■letemas cam farts carrelageo local. Paloa.suas carecterlatices seta sitado i <strong>de</strong>namlnado<br />
"do tipo do Vigner-Brillauln"<br />
Wan<strong>da</strong> splIcado so mo<strong>de</strong>l° do An<strong>de</strong>rsen. s balosa temperatures. eats tienles @presents dIfIcul<strong>da</strong><strong>de</strong>s<br />
no regime Rend*. Pare anaillar o problem& consi<strong>de</strong>rsmas um me<strong>da</strong>lo ds bends InfInItamente<br />
traita quo i amtamente mplUvel . sacciparamosasolugio @zeta comforesultads <strong>da</strong> tienles <strong>de</strong>'<br />
W.B. no epraxInegio maim simples. Nostrums qua sited° <strong>de</strong> W.B. nee <strong>de</strong>scries carrataments o estm<strong>de</strong><br />
fun<strong>da</strong>mental no regime Rondo. Comparases as energies ebti<strong>da</strong>e pale setado &promised° <strong>da</strong>s 'quasi<br />
partIculas reals"(31. cam as <strong>da</strong>le's polo mitodo <strong>de</strong> N.G., quo utilise as *quasi -partIculss estatiscos".<br />
Calculamee as prebebIlids<strong>de</strong>s polo mikado Y.B. a es aemparemse cam foe rasulta<strong>de</strong>s szatas.<br />
(1) N. Reiter a J.C. Rlshall. Int. J. Magmata= 1, 233 (1671).<br />
(2) H. Reiter. Z. Phys. 830. 167 (1978).<br />
(3) N. Netter a G. Nerendi. Phys. Report. 108, 227 (1884).<br />
.wim■. 11<br />
MET/0:40/4A f ESTADO FUNDAMENTAL OE UMA IMPUREZA OE URANIO EM METAISI zelcLusAD<br />
DE EXCITACOES ELECTRON-OURACO 00 MAR OE FERMI, MARIA CRISTINA F.<br />
L. LARA E ANTONIO CLEVES NUNES - UnO - OEPARTAMENTO OE FISICA, 70910 BRASILIA-OF.<br />
0 anted° fun<strong>da</strong>montal s unn 'mucus cita<strong>de</strong>l excltado ■ <strong>de</strong> use lmpursce <strong>de</strong> Ura<br />
nlo <strong>de</strong> And lutuando antra dues canfiguragiaa magnitlae ■ num mar <strong>de</strong> eletran:<br />
'Ivrea i ra-examinado Incluindo-se excltageess sletron b do Mar <strong>de</strong> Fermi nes<br />
funcaas varlaclunals. VerlfIca-e0 qua a simples aaaaaa ga <strong>de</strong> um per eletron-buraco<br />
ailment. a snergla <strong>de</strong> anneragia entre n ■ Ingleto a anted° magnietIca par um fator<br />
varlando <strong>de</strong> 1.8 a - 3. <strong>de</strong>pen<strong>de</strong>ndo <strong>de</strong> ratio entre as largures <strong>de</strong>s ban<strong>de</strong> ■ do eandu<br />
cif a nfvul f regimen in
NET/9:00/4AX<br />
rommrssAo NO NOD= DE ANDERSON - PALICOV<br />
Hi<strong>de</strong>mbergue O. Pro* - Universi<strong>da</strong><strong>de</strong> do Amazonas<br />
Cm trabalho reeente (1) estu<strong>da</strong>mds a fotodmiesio no mo<strong>de</strong>*<br />
<strong>de</strong> An<strong>de</strong>rson <strong>de</strong> uma *purest. con a utiliaagio <strong>da</strong> tieniea <strong>de</strong> Grupo <strong>de</strong><br />
Ranormalizagio <strong>de</strong>aenvolvi<strong>da</strong> per Wilson (2/ . No presents trabalho °stenos<br />
generalizando o calculo anterior. levando em consi<strong>de</strong>ragio o efeito <strong>da</strong> interagio<br />
coulomblana entre os alitrons do orbital <strong>da</strong> impureza a os ell<br />
trona <strong>de</strong> condugio. * gun equivale a aereseentar o tame<br />
H' ■ C+ C .<br />
fu fu ku ku<br />
ao hamilteniano <strong>de</strong> An<strong>de</strong>rson. ands C fu <strong>de</strong>stroi um elStron <strong>de</strong> spin u no orbital<br />
<strong>da</strong> impureza a Cke<strong>de</strong>strdi um eldtron <strong>de</strong> spin u . na bands <strong>de</strong> condo<br />
1) Hi<strong>de</strong>mbergue O. Pro* and Luis N. Oliveira. Phys. Rev. 8.33,7871 (1986)<br />
21H.R.Krisbna-murthy.J.W.Wilkina. and R.G.Wilson.Phys.Rev.B 21. 1003<br />
)1080): 21, 1044 (1980)<br />
mmmmmmummo<br />
ME119:20/4A.F1<br />
P0T0E71ISSA0 DR um N=VBL PROFUNDO EM<br />
COMPOSTOS DR VALEMCZA FUMANTI<br />
Makoto Yoshi<strong>da</strong> a Hi<strong>de</strong>mbergue O. Pro* - U. do Amazonas<br />
Dando continui<strong>da</strong><strong>de</strong> sos eatudos realized°s no mo<strong>de</strong>l* <strong>de</strong><br />
An<strong>de</strong>rson <strong>de</strong> ums impuresa. cam aplicagaes a compoates <strong>da</strong> valincia flu<br />
tuante (1) , discutimed a fotoemiasio <strong>de</strong> um nivel prof undo pore quail<br />
guar par metros do mods*. <strong>da</strong><strong>da</strong> a importancia <strong>de</strong>ans espectroaeopla<br />
pare a <strong>da</strong>terminagio do ndmero <strong>de</strong> ocupaglio do orbital 4f dos ale -<br />
mentos <strong>de</strong> t raraa nal:Nolen composted.<br />
1) Hi<strong>de</strong>mbergue .O. Pro* a Luis N. Oliveira. Phys. Rev. 8,-33. 7871 (1986<br />
vo■<br />
MET/9:40/4A.F RESSONENC1A MAGNETICS NUCLEAR OE SISTENAS ADSOMPOS Eli METALS -<br />
M ' A. Whitaker e Luis Nunes <strong>de</strong> Oliveira. OFCMIIIIISC/USP<br />
&studies' Lauri to s relaxagio nuclear <strong>de</strong> moldculas alqorvi<strong>da</strong>s en sub<br />
matinees. tommndo coma base medi<strong>da</strong>s <strong>de</strong> NNE plonking, do -C do CO s<strong>de</strong>orvi<strong>de</strong> qui<br />
■icanente em platina. faits. por Ru<strong>da</strong>s at el Calculamo ■ tempos <strong>de</strong> relmaselto<br />
. pin ro<strong>de</strong> nuclear <strong>de</strong> um. molecule adsorvi<strong>de</strong> em use superlIcie matinee usendo 0<br />
■o<strong>de</strong>lo <strong>de</strong> An<strong>de</strong>rson <strong>de</strong> ume imp A diagoneliseeilo do Hamiltonian° <strong>de</strong> And<br />
se baseia em t<strong>de</strong>nicss <strong>de</strong> erupo <strong>de</strong> 00000 maliaeglo e a tame <strong>de</strong> releaelllo d calcula<br />
<strong>da</strong> its ■ pree:1..0o <strong>da</strong> reeve <strong>de</strong> Ouro <strong>de</strong> Fermi. Serie ap <strong>da</strong>m s discuti<strong>da</strong>s cur<br />
vim dm <strong>de</strong>pen<strong>de</strong>ncie con a t dm taxa <strong>de</strong> relmitaglo spin reds.<br />
(1) S. lu<strong>da</strong>s ec.al.. Pkys.11ev.Lett. 54. 71 (19115).
NET/10:15/4A.F I ERUCT= DE EMI DR IONS COM BSTADOS FUNDARENTAIS BID 5 6lI CONFOSTOS DE VALEN-<br />
CIA 1NTERNEDIARIA (VI). Fable A. Venues U. Caton E. Barber's- Institut° <strong>de</strong> Plaice, MEAN-<br />
13081 Campton. (S.F.)<br />
Nestes Ultimo anus terse publicado resulted°. esperlmintals <strong>de</strong> Iona ds tetras rrrr ■ cam mita<br />
do fun<strong>da</strong>ments' nio S am C.Pd3. que i um tempest° qua op felto el! VI, TPd3 MOO proem.<br />
Visando'interpretar eases @spectres ezpertmentale lotfelt. uma simulate° dos @spectres <strong>de</strong><br />
CaFd3:Dy a 1143:Er (P. A. Tunas U. sod C. R. Barbieri.. Free. of the V International Cool. on Va<br />
lento Fluctuations. Plenum ) obtand-se algune parinetres important.. come <strong>de</strong> tempo crlstalino<br />
ramie*. no mon<strong>de</strong> rasa tom ba rrrrrr presItio cuas<strong>de</strong> comparado cum resulted°. experismetals <strong>de</strong> es<br />
palhamento Inelastic° <strong>de</strong> neutrons. /trim. *aces espectres apertures um comportment. <strong>da</strong>m imam!<br />
&A<strong>de</strong>n <strong>de</strong>s lInhag dm reminnfinela quo <strong>de</strong>pends. do camp° umanitlen ■plIcado. Mete Erebelho tarokslims<br />
at rrr r <strong>de</strong> um =dile estecintico a efelto <strong>de</strong> VI pars <strong>de</strong>screver one tlpe <strong>de</strong> co.portsmagru.<br />
FiZ,1110:35/4A.F ESTUDO Di RPM B CAMPO CRISTAL1110 BR Olid 3 - Maria Jos; Pontes<br />
nitrite C. Candra - VULCAN! - IPCII =.Csmpimas, SP.<br />
0 compost. 014 3 i estu<strong>da</strong>do como referincia pars o compouto fernion-pseado<br />
010 t 3 par apr eeeeee r ■ mamma @strutter ■ hexagonal possuir <strong>de</strong>nsi<strong>da</strong><strong>de</strong> dm salad*s no<br />
nivel <strong>de</strong> Fermi comp - 1 a us metal normal.<br />
Os 'spectre. <strong>de</strong> RFS obtido ■ pars 011 3 aprementam 2 ■ hies distinct.: us ci<br />
biro a um hexagonal que sio anolisa<strong>de</strong>a sepor.<strong>de</strong>ment.. A partir dm bamiltonisn ■ Pa-<br />
ra a camp° <strong>da</strong> simetris hexagonal construimos o wises. <strong>de</strong> i<strong>de</strong>als pars os ions Br"<br />
▪ DF 3+ pare a sftio hexagonal. Foram calculedos os valorem <strong>de</strong> gperry s g// 's fungi°<br />
do parimetro do campo cristallib x pole o ■ttio hexagonal °cupid° polo Sr comet impu<br />
teas mmgnitica is 011 3 . A partir do .spectre experiment.' do pi (lateral Serf<br />
9.22 pare o Br quo OOOOOO ponds& x.-.5. Otilisando este valor <strong>de</strong> x pars o *Ws cu-<br />
bico, i previato um eatodo fun<strong>da</strong>mental r 6 a us Estado excited° r 7 suite praxis.* en-<br />
▪ quanto que pare a Dy. z.+.5 i provisto um r 7 fun<strong>da</strong>mental. Os empectros expetrimen-<br />
tabs confErmas *sta ■ previsies cos g(r6) ■ 6.59 s g(r 7 ) ■ 7.06 pare o Br e g(7 2 ) ■<br />
1.16 pare o Dy. Os valorem do a sip miores qua is isolantes <strong>de</strong>vido i sits sufficed-<br />
bili<strong>de</strong><strong>de</strong> <strong>da</strong> matri ■ . Este trabalho Tot panashmete financiado e.,le t71e,1 la RAMC"<br />
NET/10:53/4AS I'm DB IONS TEBRAS RARAS BR CONFOSTOS IRTERMETAL1COS DO TIPO eye.<br />
J.F. Su ssssss F.C.C. Candra.<br />
Rest. traballto. reaultads experimental. <strong>de</strong> Ressoancia Faramagnitica Bletri<br />
mica <strong>de</strong> tons <strong>de</strong> rrrrr Kerma Cd 3 4 Rd Br 3. e Tb" em -nomposeos intirmatilicos do<br />
tipo C11 3Au sin ■p dos a analiesdos. Betio send Envestigs<strong>da</strong> ■ as girl. ■ ABbe<br />
TR (A ■ La. Cp, T e Set TR ■ Cd, Nd s Tb) AFt 3 t TR ( ■ w La. T a 5c1 Ti .0 CC Br m<br />
Tb) slim do eompost° 13041 3 sTR (TR ■ Cd. Sr e Tb). A ememplo do que ji foi observa-<br />
do nos series tipo AB AS 2 , verlfica-se nestles 'fries A11 3 quo os <strong>de</strong>slocamentos dO<br />
/star g <strong>da</strong>m Unitas <strong>de</strong> SFR <strong>de</strong>pen<strong>de</strong>m <strong>de</strong> mods 'platen:tic° <strong>da</strong> posilio do element B ma<br />
robvla eerie-edit.. Alin dime., o valor e sins' do parluetro do incept to elf/Mi-<br />
ca, Jou. foram eeeee trados <strong>de</strong>pen<strong>de</strong>nt.. tamto <strong>de</strong> posigio do element B come do fon<br />
<strong>de</strong> terra rate TR, diludo no Estrin. Bates resaltados. immanent@ tom aqueles<br />
ma sirie APt1 3 , ji eat ssssss s tea literature'. sio disenti<strong>de</strong>e levaado-se as con<br />
to o ratt ler ■ ou d dos al:trona <strong>de</strong> bands has come o rat° ante. <strong>da</strong>SimP loca-<br />
lisa<strong>da</strong>s <strong>de</strong> terra. rrrrr .<br />
Trebalho subvencionedo polo CNN' FAPESP.<br />
1 - S.E. BARNES. ADVANCES IN MIMES, 30, 6. 801 (1981)
MET/11:15/411.F<br />
EPS NOS COMPOSTOS LaNi 5-5N (II Al, Pd. Cr. Mn e Pt) F NOS SEUS<br />
IIDRETOS METALICOS. L.S. DuarteeJPS<br />
Rotas:a ■ invassigsndo os compost° ■ matilicos <strong>de</strong> familia do LaNi 5 du<strong>de</strong> items'<br />
<strong>de</strong> Ni sin substituidos eer Ai, Pd. Cr. No e Pt. upend° a ticnics <strong>de</strong> R is<br />
P goitics Elsitrinics s Gd 3 come fon <strong>de</strong>.prova. Como i ben o Lapi s i 1 ,<br />
um composite <strong>de</strong> sits impostincia tocuologico <strong>de</strong>vido son capaci<strong>da</strong><strong>de</strong> <strong>de</strong> abserver gran'<br />
<strong>de</strong>s quasti<strong>de</strong><strong>de</strong>s <strong>de</strong> hidroginio in condisiss normais <strong>de</strong> temp aaaaa ri r p . A<br />
substituisio do Ni piles element°. N vise corrstscionor L Istrimicose estruturai<br />
■ nests ■ saris co ■ a estsbilido<strong>de</strong> <strong>de</strong>s hidretos correspon<strong>de</strong>nts., vie perims-<br />
Ira. <strong>de</strong> EPA. Tariflassam quo. Pars N AL a Pd. a-shift d ■ linhe <strong>de</strong> SP ■ do C43<br />
dra.ticamente <strong>de</strong> negative (fig -11,11) no LeNi 5 par. positive (Ag 0.05)nol<br />
1.1/1 5 . 5AS ig (ategl) e LeNi 5 _ 5Pd a(0.ta0). As investigsqies per. N Cr. No s Pt es- I<br />
tin en am<strong>da</strong>mento. Qusodo a. compost°s ■ io.bidrogvnados, o valor <strong>de</strong> g ss dosages<br />
(sumps. pore lido positive) evidsoriando ■ faitos <strong>de</strong> astrutur ■ eletrinica cause-<br />
<strong>de</strong>s psi ■ absorsio <strong>de</strong> item*. <strong>de</strong> hidroginio. Uma discussio dos resulted°. <strong>de</strong> APR<br />
s ■ temps <strong>de</strong> ostobili<strong>da</strong><strong>de</strong> dos hidretos LaNi N II serf .presented...<br />
S-a y<br />
Este trsbalho eats sendo subvencionado 10 FAVEMP a CAPES<br />
:IET/11:35/4AFI VARIACAO OA ANISOTROPIA CON A M1PERATURA EM CONPOSTOS C15: HEDIDAS OE CORRE-<br />
Late° ANGULAR otr. RENCIAL (CAD). Paulo R.J.Silva e HenrIque SaItovItch (Centro BrasileIro <strong>de</strong> Pes<br />
guises <strong>Fisica</strong>' - CNN, Rio <strong>de</strong> Janeiro)<br />
0 compost° binirio do tipo C15, HfV2, apresente temperature <strong>de</strong> trensicio supercondutore Tc -9K. A.<br />
presents ain<strong>da</strong> um" transIcio estrutural cubic-ortorrEmbica em 71-110K. Nedi<strong>da</strong>s <strong>de</strong> correlacio an<br />
Glair Integral, no interval° <strong>de</strong> temperatures 831-3001, realiza<strong>da</strong>s no HfV2 per Jain it al.() evil'<br />
<strong>de</strong>nciaram use variacio <strong>de</strong> 0,25 a 0,12 nos valores <strong>da</strong> AnisotropIa quando a temperature variava <strong>de</strong><br />
3001 a 831. _Tal variacio fel associa<strong>da</strong> a recuo do Istopo-son<strong>de</strong> quando <strong>da</strong> emissio dm radtacio ga<br />
ma e a ocorren cla <strong>de</strong> flutuacio em mIcrodominIos eventualmente existent's na fase cubica do compel<br />
to. .clam <strong>de</strong> 110K.<br />
Atravis <strong>de</strong> sedI<strong>da</strong>s <strong>de</strong> (CAD) no H/12 <strong>de</strong>termInamms os valor's <strong>de</strong>s Interviews quadripolares, oasis<br />
come us valores <strong>de</strong>s anisotropies, no Interval° <strong>de</strong> temperatures 4.21-110011. Para tante utIlizamos<br />
um sistema <strong>de</strong> medI<strong>da</strong>s comquetro <strong>de</strong>tetores e en<strong>de</strong>recamento shmltaneo <strong>de</strong> coincidincias; isokopo<br />
-son<strong>de</strong> foi o Ta181 e o lIfV2 foi fabricado an form <strong>de</strong> arco, em ateosfera <strong>de</strong> arginio. As medi<strong>da</strong>s<br />
<strong>de</strong> (CAD) m)straram:<br />
a) a transIcio estrutural ocorre em Intervale <strong>de</strong> temperature <strong>de</strong> <strong>de</strong>s graus, conrivendo nesse inter<br />
vale as rases cubica e ortorrimbica;<br />
b) tratemento termico a 1000C, durante 15 dies, nao parece - alterar as proprie<strong>da</strong><strong>de</strong>s do HfV2;<br />
c) os valores <strong>de</strong> Intereclo quadripolar sofrem greeds variacio ao passer o compost° <strong>da</strong> fase cibico<br />
para ortorrimbica;<br />
d) os valereS <strong>da</strong>_anIsotropla no Intents t.0, naquele interval° <strong>de</strong> temperature em quo ocorreram<br />
as mmdl<strong>da</strong>s, nao epresentam variacoes marcantes.<br />
()"Lat.Inst.Ef.In HfV2 Let'-H.C.4*In it al.:PhyslCS Letters 111(19031 419.<br />
NET/11:55/6A.F1 oxIna00 terrain EN LIGAS DILUIDAS DS ■ e/. Maria I ' ha Xavier<br />
Silva, J. Schaf, P.J. Vi aaaaa a A. Vas meg TIF=UFFETT7----<br />
I.A. Cam 1171-17-K. Ls lam s P. viil et niversiti Paris-Sud ■ Ormsy<br />
Yang. -<br />
Lig.. <strong>de</strong> ?eV 0.5 at 5 em 0 f ' dos a aaaa is d.. ticoices <strong>de</strong> . Sco<br />
<strong>de</strong> Spin SsE pia Kftsbauer. Ob -se. per amebas as ticnicas, que um<br />
mince termite a 1000 IL per 10 minutes (e ■ aaaaa ) lava i pracipitsq:o dos its<br />
mos <strong>de</strong> vanidio /Ir ■ fora <strong>de</strong> ro<strong>de</strong> do Cerro. Este Ise° foi interprotado coma in<br />
i<strong>de</strong>ate <strong>de</strong> oxidsqao interns do vanidio divi<strong>de</strong>r i presence <strong>de</strong> osigioio sdsorvido na<br />
■uperficis dos gries due amostras A - La <strong>de</strong>ists sfsito esti son<strong>de</strong> agora vs-<br />
rifica<strong>da</strong> em liming ■ e pars 00000 mentos tirmiaos a temp quo 1000 K,<br />
utiliasudo-se s Sap pia MBsobaumr.<br />
■■■■■ - ■■ ■ ■<br />
■
IfET/13:00/SA.F 1APROUNAVISS ANALiTICAS PARA A DESSUADI OS ESTADOS EN SISTSUAS<br />
DISOADINADOS. Luis Carlos S. do Namcimemto (Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral Flumieense -<br />
Institute <strong>de</strong> <strong>Fisica</strong>).<br />
Consi<strong>de</strong>rs-eta uma Siam biniria do tipo A01.11 <strong>de</strong>scrita por uma liamiltoeiaue<br />
do Hoagies fortes, tom interegies entre primeiros violation. um orbital per sltio,<br />
a <strong>de</strong>sor<strong>de</strong> ■ diagonal.<br />
Otilisando-so ■ tearia <strong>de</strong> 'racism contioua<strong>de</strong>s. obtain-sa aproaimacies anal)<br />
ticss para a <strong>de</strong>osi<strong>da</strong>ds <strong>de</strong> estados aletrinica ■ do uma ca<strong>de</strong>ts uoidimausialial ausTa<br />
cipo. 0 mitodo pods star facilments esteadi<strong>de</strong> Eara uma redo Is Baths.<br />
Compara-se os resultados cam as aproalmscos ■ ■ualrtices Gaud. tips VCA,<br />
ATA a CPA.<br />
MET/8:20/5A.F "ORBITAIS MOLSCULAMW DE METALS B LIGAB . Diane Guenalusrger.<br />
e D.R. Ellisleentro Brasileiro ds Pesquisas <strong>Fisica</strong>s a Northwestern<br />
University.I.<br />
Proprie<strong>da</strong><strong>de</strong>s magniticas.aletronicas hiperfinan <strong>de</strong> metals lilas sem esto<strong>da</strong><strong>da</strong>n<br />
calculando-se a estrutora elatanica <strong>de</strong> aglomerados finite's dm Atoms polo miter<br />
. do variational Discreto 1D.B.Ellia, Int. J. Blunt. chem. 132 , 35119681) na<br />
aproximacio <strong>de</strong> <strong>de</strong>nsi<strong>da</strong><strong>de</strong> local para a interacio <strong>de</strong> troca, com polarisacio <strong>de</strong><br />
spin. Mims ■ intemas eetu<strong>da</strong>dos slo as lig.. dm Fs a Ti, as ligas <strong>de</strong> Fe a Ni<br />
or<strong>de</strong>na<strong>da</strong> ■ a dsoor<strong>de</strong>na<strong>da</strong>s, a as lig. ■ <strong>de</strong> Fe a Al. Bio obti<strong>da</strong>s <strong>de</strong>nsi<strong>da</strong>dse <strong>de</strong> estedo,<br />
<strong>de</strong>slocamentos isomeric°, Nftsbauer momenta. sagniticos a gradients. <strong>de</strong>.<br />
campo elitrico. (D. Omen:burger e D.B.1111in. Phys. Rev. 8 31, 93 1198511 3.<br />
I Nag. Nag. Rat. 59, 139 11986); D. Guenaburger a D.11.1111ii,a ear publicadol.<br />
ET/13:40/5A.F I<br />
OeterminagSo <strong>de</strong> Realstlwi<strong>da</strong><strong>de</strong> El:trice e Comportamentd Critic° em Ferromagnetoe<br />
.<br />
Francisco A. 0. Cabral. Sergio Game e Minato F. Jordim - OFESCM - UmICAMP<br />
At <strong>de</strong> uma pimples montosem ■ xporimental nos estu<strong>da</strong>mo ■ o comportomen-<br />
to critico <strong>de</strong> reilstivi<strong>da</strong>d ■ alitrice em elstemes ferromesniticos nas vizinhances<br />
<strong>da</strong> temperature <strong>de</strong> Curie (7 c ).<br />
O mamma aporato n utilized° na <strong>da</strong>terminagio oe T o em 'totem's (Rd-Fe1 com<br />
ccccc levole cans do Fe.<br />
lI Parcialmonte rinanciado pole FAPESP
MET/9:00/5A.1"<br />
MEDIDAS DE RESISTIVIDADE EL MCA SEM =TAM EM MAW<br />
Renato <strong>de</strong> F. Jardlm, Dornardo Lai' ■ a Claudio Santa. - QFESCM IFC - UNICAMP<br />
O metodo <strong>da</strong> contra corrente (Eddy Current Decay Method) a o mitodo A.C.<br />
(Steady-State). pars med/<strong>da</strong>s <strong>de</strong> resistivi<strong>da</strong><strong>de</strong> elatrica em metals see contatos.<br />
slo comparados em termos <strong>da</strong> teoria <strong>de</strong> sistemas linear... Teoricamsnte ambos os<br />
mikados sio equIvalentes. sae <strong>de</strong>ntro <strong>de</strong>s consl<strong>da</strong>ragOes experimentais 0 matodoA.<br />
C. 6 preferivel pare uma larga faixa <strong>de</strong> valorem <strong>de</strong> resistivi<strong>da</strong><strong>de</strong>s.<br />
Dom versio simplifica<strong>da</strong> do mikado A.C. basea<strong>da</strong> na medl<strong>da</strong> <strong>de</strong> angel° <strong>de</strong> Ease<br />
a <strong>de</strong>serita. ands um. simples medi<strong>da</strong> <strong>de</strong>ath a suficlente pars a <strong>de</strong>terminagao do valor<br />
absolute do reslstivi<strong>da</strong><strong>de</strong>.<br />
O tratamento .xato pare a geometria cilindrica maciga a pars emostras cam<br />
geometria tipo cillndro circular ace alio originals a apresentam resultados interessantes.<br />
Finaneiado parcialmante pela FAPESF.<br />
MET/9:20/5A F<br />
orreemzukao DE ESPESSMA B CONDUTIVIDADE DS =WAS<br />
METILICAS CILbIDRICAS SEM COMTATOS<br />
Renato <strong>de</strong> F. Jerdim. Bernardo Loki 0 Claudio Santo. - DPESCM - IFOR - =CAMP<br />
O matodo A.C. (Steady-State) pare a <strong>de</strong>termlnaqio <strong>da</strong> condutivi<strong>da</strong><strong>de</strong> elatrica<br />
am came<strong>da</strong>s Natalia's a discutido. Sio apresentados <strong>da</strong>is cases distintoss<br />
a) Cama<strong>da</strong>.<strong>de</strong> condutivi<strong>da</strong><strong>de</strong> a 2 a aspessura LI cobrindo um cilindro isolante (a 0)<br />
▪ rain a.<br />
b) Cana<strong>da</strong> <strong>de</strong> condutIvi<strong>da</strong><strong>de</strong> espesaura D cobrindo um cliindro <strong>de</strong> condutividsa<br />
<strong>de</strong> a (a # (1) a gala a.<br />
Sio apresenta<strong>da</strong>s comparagies con cama<strong>da</strong>s motalicas (filmes) - con geometria<br />
retangular.<br />
Financiado parcialmente Fiala FAPSSF.<br />
NE1/9:40/501.F Slims PARA MOEDA DE atSisTIVIDADE ELETRICA mom/Tow DA CONFMA-COARENTE.<br />
Fernando K. Araujo Morioka s Jost Antonio liras (Depart/manta <strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral<br />
dTrao Carlos - Sea Carlos -sir----------------<br />
0 .itodo <strong>da</strong> contra -correote (eddy-current method) a particularnemte e<strong>de</strong>quedo pars Nair<br />
resistivi<strong>da</strong><strong>de</strong> elitrica <strong>de</strong> amo metilicas cam balsa resistivi<strong>da</strong><strong>de</strong> a i Wimp tempersturasopess<br />
do o mitodo dos quince terminals toren-se imprecise. A tissues <strong>da</strong> contra-corrents consists fun -<br />
<strong>da</strong>mentelmente es rduair bruscament* i sera camps maanitico constants aplicadto i amours. quo<br />
se meaner& no centre <strong>de</strong> um @fates. <strong>de</strong> babies, concintricse (primirio a sacundirio). A variscio<br />
brumes do coupe magnitice Indus no amours torrents, <strong>de</strong> Foucault. cojo <strong>de</strong>caimento espeasocial cum<br />
tempo i <strong>de</strong>tect/ado pela babies secundiria. Fe<strong>de</strong> -se =attar qua a constants <strong>de</strong> tempo dome <strong>da</strong>mascene<br />
expeeemcial i inversmmeste propereiemal i resistivi<strong>da</strong><strong>de</strong> sautes a do material (I p-1).<br />
Esti son<strong>de</strong> montado um sisters qua prmita i<strong>de</strong>otiricar a realio ns qual o iroal <strong>de</strong>tected° polo ■ecundirio<br />
i uma asponencial pure. Kantendo o sistema <strong>de</strong> bobinas a 77E pretends-am o<strong>de</strong>quar o ■ istama<br />
peva Sadie rasistivi<strong>da</strong><strong>de</strong>s aboolutas entre 77E a 3SOK.
fa.<br />
HET/ 10 : 15,5Ar<br />
I<br />
ESTADOS ELETRONICOS EM INTERFACES RETALICAS - Gilmer E.Nerqua.losi P.R1no<br />
Nelson Stu<strong>de</strong>rt s Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Sao Carlos - UFSCar<br />
---IirMairatranicos priximos <strong>de</strong> um. Intsrfacs motel-amp ■is forados ale interagao etratIve<br />
don eletrons cos as &mel<strong>de</strong>d's <strong>de</strong> eerie <strong>de</strong> poleritesio Indusi<strong>da</strong>s nos metnie.0 potemial i caseate<br />
<strong>de</strong>noseinedo potencial imam s as estados locelizados nao sonheadoe comp setae. Interfacial..<br />
Superficien metilicas 'presentees um@ grand. arias& <strong>de</strong> estados suarficias <strong>de</strong>pen<strong>da</strong>do do<br />
materiel e ds orlentegio eristelosrifica do plena <strong>de</strong> superfast. do metal.<br />
eta o presonte.o. calculos <strong>de</strong>stss estados 'tarantula usam um mo<strong>de</strong>lo multo ■implificado es potencial<br />
pare is <strong>de</strong>terminer a espectro ds anomie) ou <strong>de</strong> emissio <strong>de</strong>stee ostedos quanticos.<br />
Resulted°s experiment/11s <strong>de</strong> foto-adonis ou foto-adosio lawsa dmmmnstrem m nee...la<strong>de</strong> <strong>de</strong><br />
minor.. =<strong>de</strong>la tearican.ums vex que as earls. <strong>de</strong> navels eletraniars do tip° hidrarnol<strong>de</strong> resultants.<br />
do mato <strong>de</strong> potenciel imam classics permits Wean um anscricio qualitettve <strong>de</strong>nts. sated°.<br />
Interfacial..<br />
Neste trabelho esteems propondo calculer a estruture eletrinice <strong>de</strong> @sta<strong>de</strong>s eletranicos em interfaces<br />
natation ads o patents( confinedor i <strong>de</strong>terminedo psis Dalai° <strong>de</strong> num:Trim do @quasi°<br />
dm Poisson pars as Mete= ado a constant. dielitrice varis suevemante <strong>de</strong>eds sou valor no mate(<br />
(bulk) ati o valor 1 no vacua.. do 'matching" <strong>de</strong>ists potential periadico do metal em as surto<br />
piano conveniente.Com este Na<strong>de</strong>l° espereas po<strong>de</strong>r <strong>de</strong>ncrever sates estedos interfacial. <strong>de</strong> =-<br />
mina male realists ■ cam mother paella° quo os raultmdos obtidoe cos o potencial lasso stamina<br />
COM lancelets .<br />
KE-T/10:35/SA.FI POOPRIEDADIS MAGNETICAX DO SISTAKA INTERNITALICO Hfins i _xAlx 1 2<br />
C. K. <strong>da</strong> Silva. P. P. Livia, H. Panarotto**, S. F. <strong>da</strong> Cunha** a A. A. Gamma"<br />
poniveral<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Rio Gran<strong>de</strong> do Bull a (**Centro Srasileiro <strong>de</strong> Peaguisaa<br />
<strong>Fisica</strong>.).<br />
0 aistema intermetilico, pseudo-binerio. Hf(Fe,_..l.12 fol'obtido pars concen-<br />
trate's entre x=0,02 a a ■0.60. 2 sabido gm extflio-HiPa, apresenta um gelato-<br />
ra <strong>de</strong> !age entrutural C14 a C15. Sots mistura do face permAnece ate que pars<br />
0,150,60 difratogramas <strong>de</strong> raio-x mostram ums Ease C14 hexagonal pura.Neata fat<br />
xa <strong>de</strong> concentrated foram feitas algumas iodi<strong>de</strong>s <strong>de</strong> magnetizacao on fungi° ds tem=<br />
psratura a do campo aplicado. Para . ■4,30 e x.0,35 ocorrem efeltos diferentes a<br />
baixas temperatures, quando as amOStras sio rearia<strong>da</strong>s nom a sem campo.magnitico<br />
aplicado. A temperature <strong>de</strong> Curie <strong>de</strong>cresch coma o aumento <strong>da</strong> concentracao <strong>de</strong> Al co<br />
mo previsto. Sio feitas tambem algumas consi<strong>de</strong>racAes sabre a estabili<strong>da</strong><strong>de</strong> estrus<br />
tural, assle como uma proposta pars a <strong>de</strong>scriao dwestrutora eletrenica em presen<br />
ca <strong>de</strong> <strong>de</strong>sor<strong>de</strong>m induzi<strong>da</strong> polo Al.<br />
imma■mmas.<br />
MET/10:55/5AF ESTRUTURA surname DO HMI= DS li<strong>de</strong>e. !Man Z. dm Silva e C.A. Mohnen.<br />
Inatitoto <strong>de</strong> Fillies - UNICAMP - Compindo.<br />
(Woos o formals= LISTO (Linear Muffin-71n Orbital Method) pare estu<strong>da</strong>r a astrotura eletranica do<br />
Pd3Feti no fay ferremasnatiem. A aniline dos ba<strong>de</strong>. <strong>de</strong> engrain e <strong>da</strong>nelds<strong>de</strong> <strong>de</strong> esteem forage as<br />
bog entendimento <strong>da</strong> Influencln do bistros/610 no composites interatilico Pd3Fet. Verifies.= ass reducio<br />
drastic@ dos momenta mmeniticos nos varies eitlos no carp do compost° hidrosenado. Verlficemos<br />
iambi's quo a hidrogemerso acerretm em um eumento conol<strong>de</strong>riad no coeficlente linear do calor especi<br />
Cleo eletrionica. o que evi<strong>de</strong>ncio as alteraies mar antes nee preprle<strong>de</strong><strong>de</strong>s <strong>de</strong>ices do Pd3Fe spas a<br />
hiamenacio.
MET/11:15/5A.F DETERKINACAO "All INITIO" DA CONSTANTE DE RIGIDEI DE MAGNONS NO<br />
FERRO E NO NIQUEL. R. Becharn Nuniz. J. d'Albuquerque e Castro (Instituto du UFF<br />
Niteroi - RJ - 24.210) a E. 2. <strong>de</strong> Silva (Instituto <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> Unicamp - Campine%<br />
S.Paulo).<br />
A constante <strong>de</strong> rigi<strong>de</strong>z <strong>de</strong> magnons I calcula<strong>da</strong> pars o Ferro a pars o Niguel utili-<br />
zando a eproximacRo local pare a interacIo <strong>de</strong> correlogio a troca e o mikado LNTO<br />
(linearized muffin-tin orbitals) na aproximacio ASA (average sphere approxima-<br />
tion).<br />
Os resultedos obtidos esti° em ekcelente acordo com os valores experimentaist<br />
que I particularmente significative no caso do ferro. pare o qual cilculos ante-<br />
riores apresentam consi<strong>de</strong>rivel discrepancia con a experiencie.<br />
HET/11 :35/5A.F IBANDAS COM POLARIZACAO DE SPIN VIA NiT000 OE RECORRENCIA. Sonia Frota-Pessila<br />
(Instituto <strong>de</strong> <strong>Fisica</strong> <strong>de</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> 510 Paulo)<br />
Apresentamos um esquema simples baseado no mdtodo <strong>de</strong> recorrencia, numa Hamiltoniiina 'tight-<br />
-binding° parametriza<strong>da</strong> usando o LMTO e numa versa!) autoconsistente do criteria <strong>de</strong> Stoner,<br />
qua not permite avaliar momentos magnEticos em ligas <strong>de</strong> metal <strong>de</strong> transicao. 0 esquema nao en<br />
valve nenhum parimetro iLlustevel a po<strong>de</strong> ser aplicado pars calcular a dlstribuicao <strong>de</strong> mentos<br />
locals em materials amorios.<br />
Para llustrar o procedimento calculamos os mementos magneticos <strong>de</strong> Fe e Ni no FeNly, sin<br />
tams cristalino <strong>de</strong>nsamente empacotado. Nossos resultados concor<strong>da</strong>m bantams resultados <strong>de</strong> Jep=<br />
sen a Herman. obtidos usando o mdtodo LNTO auto-consistente a spin polarlzado pare o mesmo ma<br />
terial.<br />
NET/11:55/511.v BLINDAGEM SLETRONICA NAB PROXIMIDADES DA TRANSIO0 NIDROGINIO-<br />
MOLECOLAR-NIDROGSNIO METALICO, P. A. OLIVEIRA a A. FERRAZ, De<br />
part...sato do noise - Vol - 70910 -<br />
llamado uma constants dielitrica entitles qua incorpora efeitos <strong>de</strong> estado ■<br />
<strong>de</strong> beige sacitagio pis calculanoa a mess' statism redusi<strong>da</strong> a a energia do esti<br />
ton <strong>de</strong> Slimier en fungi's do gap <strong>de</strong> energia, pars valor.. <strong>de</strong> r, prizimos a tran-<br />
■ isi° Isolants-Natal. Nossos resultados auger's um ccccc Went* am mamma efetiva<br />
antes dm transigao di ccccc Inua pars a fame netiliem.
NET/8:00/6A.F 1 MOOS LOCALIZADOS DO RIOROCANIO NO COMPOST° Ti0 eroaCrNollA I ESTI= POR<br />
LEPALMANENTO INELASTICO DE MUMS LENTOS. Joni Nestnik Filho Lashio Antonio Viable (Divisio<br />
<strong>de</strong> <strong>Fisica</strong> Nuclear, IPEN-CNEN/SP)<br />
Om no<strong>de</strong>s <strong>de</strong> vibrecie do Atone dm hidrogiEio, localisado on interettclos do composts ar<br />
ossenador TioAZro 2Cr11101„ foram estu<strong>da</strong>dos ■troves <strong>da</strong> ticnice di empalhementeinalistico <strong>de</strong> ni<br />
trona lentos, ofililando-si o aspect:gismo <strong>de</strong> ultra <strong>de</strong> kerillo-tampo <strong>de</strong> vie do IFEN-12021/SP. DO:<br />
esp. obtidos Poi passive! i<strong>de</strong>ntificar trim picas com 50Emv <strong>de</strong> larger* total a usis altura nas<br />
energise <strong>de</strong> vibragio <strong>de</strong> 05, 115 a 141umv. Pars interpreter mama resultado juntsmanta cam es intim<br />
sid<strong>de</strong>s dos picos, roan:Go-ma uma anilime pars <strong>da</strong>teruinar os tipom difarente ■ <strong>de</strong> intersticio. Tr<br />
xi 000000 s no compost°, ocupado. por Stems <strong>de</strong> bidroginio. Om intersticios sae Tornados por quota<br />
Atom.. metilicos arranjados segued° on tatraadro irregulars <strong>da</strong>is doles sip Cr a Na a os suer°s<br />
<strong>da</strong>is sae prevenient.. <strong>da</strong> coubinslao a° aces° <strong>de</strong> Ti a Zr. Constatoo-m qua as trio smargias <strong>de</strong> vi<br />
brasio obti<strong>da</strong>s experissantaluants original-se <strong>da</strong> trim possivais emsbioscies dos items <strong>de</strong> Zr e yr<br />
ea fornacio dos intarstfcios. Como a natureza quimica dos items <strong>de</strong> Zr s Ti i ammelbante, con<br />
clue-ma taabin qua as trim anrgise observados ■ie <strong>de</strong>correntee <strong>da</strong> difaramcs dm Combo d doiT<br />
items. A largura dos picas i <strong>da</strong>vi<strong>da</strong> principalmante i animtiucia <strong>de</strong> trim mo<strong>de</strong>s normals <strong>de</strong> vibracio<br />
nio <strong>de</strong>generidos pars cads tipo <strong>de</strong> intermticio.<br />
NE1/8:2016R .F IFONOMS LOCALIZADOS EN SUPERFtCIES NETALICAS - A.S. CARRICO . - Depar<br />
tamento <strong>de</strong> <strong>Fisica</strong> Teirles a Experimental - UFRN.<br />
Fonona localizados am superfielea metillees sip examinedos usando um<br />
mo<strong>de</strong>lo <strong>de</strong> forgo central restrito a primeiroa visinhos. Sio estu<strong>da</strong>dos particular-<br />
manta os mo<strong>de</strong>m superficial@ do Niguel qua se acoplam cow vibragges <strong>de</strong> Oxiainio<br />
adsorvido na supernal', responeivele pals criegio do memento dipolar superficial<br />
(radon com k m 0 na cama<strong>da</strong> a<strong>de</strong>oril<strong>da</strong> e polarisados perpendicularmente s superfi-<br />
cle). Densi<strong>da</strong><strong>de</strong>s <strong>de</strong> estados see calculodss em diregios espociais <strong>da</strong> supernal. '<br />
Ni(111) usando funcaes <strong>de</strong> Green vlbracionals obti<strong>da</strong>s polo mitodo <strong>da</strong> Natris co <strong>de</strong><br />
Transferencla. Oa resultados reproduzem experlinciss cam espalhamento <strong>de</strong> eletrens<br />
em supernal's <strong>de</strong> Niguel con cobertura partial <strong>de</strong> Oxianio e sae consistent's corn<br />
outros mo<strong>de</strong>los teiricos.<br />
14E1113:40/6A.F I mD0ELO PARA ATESOACAO ULTIASSOMICA E COMSTANTE ILAST1CA EN CROMO<br />
DIO. E.P. Castro, C.E. Marques. P.C. <strong>de</strong> Camaro° (Ompartamemto <strong>de</strong> <strong>Fisica</strong>, Univarmi<strong>da</strong>d. Fe<strong>de</strong>ral <strong>de</strong><br />
Sio Carlos).<br />
Neste trabalao emsudumos o suite do or<strong>de</strong>mmento massitioo e flotoacio <strong>de</strong> in oa atomssip<br />
ol ' lea roommate elistica do crowd a suss lisss dilui<strong>da</strong>s cam =midi°. 0 procss° <strong>de</strong><br />
interasio entre ■ co<strong>da</strong> elistic s o sister =vatic° i trtsdo do panto <strong>de</strong> mists trmdinimico<br />
us mo<strong>de</strong>l° simples a introdosido par. calcular o coeficiente <strong>de</strong> stnnagio ultrossinics ■ cannonte<br />
ports <strong>da</strong> 'cite is temperature <strong>de</strong> Moil. Eau' ■ valorem calcolados concord= cam oa<br />
valor experimentais. Concloimas quo o comprimento <strong>de</strong> correlesis <strong>de</strong> spin (ou constants <strong>de</strong> diia -<br />
Alio) i o porimetro que,dstermins as difrmocas drppities entre o comport...at° <strong>da</strong> stenualio on<br />
crone pore ■ nom Signet". s ■ or<strong>de</strong>n <strong>da</strong> ermasigie".<br />
(I) CASTRO, E.P.. CARAIGO, P.C. i SOOTZSR. F.R. Solid State Comm. Z. 37 (1986).<br />
(2) 74'41.T. E.. ROBERTS. R.I.. OAT, M. I obits, s.R. Ilurphys. Lilt. 1(9). 473 (1986).
MET/P 00 /64 . r APIARAGEH ANNL(STICA PEVIDO i INTERSTICIAIS NA LIGA N11-50111<br />
Carlos Roberto Grandini (11PCu-TPCISC); Odils Plorencin (Universids<strong>de</strong> Estadnal <strong>de</strong><br />
garInpa -Pe]; Jose <strong>de</strong> Anchieta RodriguifrEERX 7 UFECir); Helen Guerrint, Hiroshi<br />
W hoa e Jose albartn Rodrigues Jor<strong>da</strong>q OF - UFSCar).<br />
Medians <strong>de</strong> atrito interne tim-se mostrado ums ferments pe<strong>de</strong>roSa<br />
no estudo <strong>de</strong> <strong>de</strong>feitos puntuals em solidos. Em particular. atemoS <strong>de</strong> imputegsS intersticimis(gases)<br />
em =Ws ou ligas b.c.c. costuvam apreSentsr telaxacoes mece-<br />
n iCaS conheci<strong>da</strong>s Como agate 5nnek. quo WOO ser eStu<strong>da</strong><strong>da</strong>s atraveS <strong>de</strong> medi<strong>da</strong>s <strong>de</strong><br />
atrito interne. Os pnlicristais <strong>de</strong> M11-501 Ti em pdso, foram suhmetidos sem qualquer<br />
trstawentn term's° a medidna <strong>de</strong> atrito interne em um pindulo <strong>de</strong> tnrcio do ti<br />
pre "Ke" <strong>de</strong>ad, 150 K R 670 K. lonateriermente, as amnStras foram trata<strong>da</strong>s termite-.<br />
mente a 1050 IC em form Com '<strong>de</strong>ep melhor quo 10' 7 Torr se que_qualquer trstomento<br />
previn tenhn Si<strong>de</strong> felts sobve a superficie <strong>de</strong>s amostras. Apes n tratenentn tin<br />
mice as amestras foram submeti<strong>da</strong>s a medi<strong>da</strong>S <strong>de</strong> :aril° Internal no mesmo Intervale<br />
<strong>de</strong> temperature. Poi observadm u s estrutura <strong>de</strong> relaxagio quo seri Interpreta<strong>da</strong><br />
corn base nos sesulte<strong>de</strong>s conheci<strong>de</strong>s <strong>de</strong>s ligas Nb-Ti dopa<strong>da</strong>s Munn, N, C, H.(CNPq).<br />
HET/9:20/6A.0<br />
IORTERKINACAO DA RNIOICIA Dl 011,11ITO DB IMPILOANENTO. POR DIPRACAO DC IAIOS-I .<br />
EN METALS E LICAS CPC. Luis Galas° Martinez& a Re Imakuma (Institute <strong>de</strong><br />
Penguins' Energitices a Nucleates - IFENC1161/51 1 .<br />
Desereve-se ■ Wlaneask automaeisatio <strong>de</strong> ea meted° pars <strong>da</strong>terninsti° <strong>de</strong> entree <strong>de</strong> <strong>de</strong>la<br />
to <strong>de</strong> wilbamanto as 'meal. s lips CPC. Vein:and° timeless <strong>de</strong> Difrecio<strong>da</strong>llaios-I.<strong>da</strong>termina-se<br />
a siemens:o qusdrities media a probshili<strong>da</strong><strong>de</strong> <strong>de</strong> <strong>de</strong>feito <strong>de</strong> empiihmmeneo, <strong>de</strong>terminando-se a<br />
pareir doses' grandmas allergia <strong>de</strong> <strong>de</strong>feito <strong>de</strong> empilbamento. 0 meted° implants& esti san<strong>de</strong><br />
automatised°, <strong>de</strong>eds a aquisiein <strong>de</strong> dodos ate a analog' <strong>de</strong> Fourier dos perfis <strong>de</strong> difracio ■ tam o<br />
use <strong>de</strong> um microcomputador Apple II. Descreve-se minds um crieirio pars 0 juste do Ilackground<br />
Linear dos plain <strong>de</strong> difracip.<br />
aolsista <strong>da</strong> Nostra& YAMS?.<br />
gET/9:40/6A.F1 gataG/A Dg PRECIPITACAO NA LICA Cu-Al-As (3.41 Al. 5.21 Ag)<br />
A. T. Adorn° (institute <strong>de</strong> Quimics <strong>de</strong> Araraquara-UNESP). N. Cilansa (Institute <strong>de</strong> Quinine <strong>de</strong> Ara -<br />
requites-003SP) a V. Girlies), (Imola <strong>de</strong> Engenharia <strong>de</strong> Sip anii:DIFY<br />
Amostra ■ <strong>da</strong> lilts Cu -Al -Al (5.41AI, 5.21Ag) foram lsmina<strong>da</strong>s a quanta 'Ai ens espessuts<br />
do 1.0 cm. temparadss a parte'. <strong>de</strong> 7500 C 'ebonite. a um memento lower:nice <strong>de</strong><br />
Id° du-<br />
use hors, a aisles temp entre 350° C 600* C. nand° ends um <strong>da</strong>m dux am<br />
tinted's trata<strong>da</strong> a use tmaperstura diluent*. Foram efatuadms medI<strong>da</strong> ■ <strong>de</strong> d 00000 gasman am<br />
°bei<strong>de</strong> um srifleo <strong>de</strong> "'siege° do d o a tamp <strong>de</strong> revani<strong>de</strong>. MI easels °bei<strong>de</strong> us<br />
grille° <strong>da</strong> influincia do [superstars a do tempo <strong>de</strong> nvelhecimento no duress.<br />
Os resuleadom sugeren use forma anslitica do tipo <strong>da</strong> aquaria <strong>de</strong> Johnson-Mehl plus <strong>de</strong>s<br />
c 00000 o process(' <strong>de</strong> inane° do prachatado. quo aumenta a &rasa <strong>da</strong> lige. Ipso permit' eatimer<br />
a energle <strong>de</strong> ativaelo do p 002 mon<strong>de</strong> En ■ (120 t 10) kJ/ml.<br />
Da<strong>da</strong>. obtidos a parch' <strong>de</strong> Miracles, <strong>de</strong> rates -I <strong>de</strong> lira 10 rrrrrr m a presence <strong>de</strong> um compass.,<br />
<strong>de</strong> Ag-A1 I<strong>de</strong>s s clue nip fel d do mina <strong>de</strong> 700° C. a qua p re<br />
forcer a hIpatme <strong>de</strong> quo a prcipleacio <strong>de</strong> uma Lase rice en prate sumanta a d <strong>da</strong> liga.<br />
Ns composirio utilisedm. ■ liga <strong>de</strong> Cu -Al -Ag parser ester pastsa do limits entre as<br />
rases correspon<strong>de</strong>nces so cobra puro e ■ uma rise composer <strong>de</strong> cobra prams, 'mbar' eta cite) ■ lo<br />
emlies<strong>da</strong> as raga° do cobra para. 0 Halite entre lasso parece leer <strong>de</strong>slaredo con a tempers -<br />
ears a a Ilga. no gated° recoal<strong>de</strong>, flea <strong>de</strong>nte* do reglio Cu 4 Ag s quando tempered' acima <strong>de</strong><br />
7000 C Localism-se tea reglio correspon<strong>de</strong>nts ao cobra puro.<br />
(CNPq)
mE1/10:15/6A.F1 ESTUDD DO EFEITO DA IMPLANTACAO DE PARTTCULAS a NOS COMPOSTOS FOR<br />
11A003 EM ACO 1020 IMPLANTADO CON NITROGENID. S.N.M. Ramos. L. Amaral, A. Vasquez. - M.T.X. Silva. F.C. Zawislak e N. Behar. Institute <strong>de</strong> <strong>Fisica</strong>. UFRGS.<br />
Neste trabalho estu<strong>da</strong>mos. por meio <strong>de</strong> CEMS. o efeito <strong>da</strong> implantacio <strong>de</strong> particulas<br />
a.no formacio a evolucio taroks dos compostos formados em ace 1020 prevision<br />
to implanted° com nitroginio.<br />
A &nil's' obti<strong>da</strong> preliminermente no aco 1020 N Rostra a formacio <strong>de</strong> carbetos<br />
<strong>de</strong> fase c e o nitreto do tipo c-Fe, ,N i<strong>de</strong>ntificados COO os parimetros KOssbauer e<br />
xistentes ma literatura. sendo qua 01espectros foram analisadoS a partir <strong>de</strong> tempi<br />
ratura <strong>de</strong> recozimento <strong>de</strong> 200 0C. quando algumas dos fases iniciais ji foram elimi:<br />
no<strong>de</strong>s.<br />
No aco 1020 N n ob aaaaa -se uma contribuicio significativa <strong>de</strong> compostos do<br />
C e ausincia <strong>de</strong> compostos <strong>de</strong> N. Observe-se tambim qua a evolucio tirmica dos compostos<br />
<strong>de</strong> C di-se <strong>de</strong> forma mais lento <strong>de</strong> modo quo em 400 0C minds temos presentes<br />
todos os compostos <strong>da</strong> fase initial. Este comportamento sugere qua os Etyma' <strong>de</strong> He<br />
inibem o mecanismo <strong>de</strong> difusio <strong>de</strong> C na zone implanta<strong>de</strong>. No entanto. a contribmicio<br />
mmis significativa <strong>de</strong> nossos resultados i a nao formats <strong>de</strong> nitretos a carbonitretos.quando<br />
<strong>da</strong> presence <strong>de</strong> ito ■os <strong>de</strong> He ads presence implies mma sirie <strong>de</strong> modificacoes<br />
no matriz <strong>de</strong> aco. conform PT <strong>de</strong>scrito to literaturo.<br />
NET/10:33/6A.F1<br />
INTSRDIVOSILO I RILACAO III MAMMAS Io/A1 le DR escudo per ROB.<br />
S.R.Taixeirs. M.A.Z.Vsscencelos, W.Schreiner a I.J.I.<br />
(u/PCS); S.I.<strong>da</strong> Silveira e V.L.Freira Jr. (FUC-RJ)<br />
Sig <strong>de</strong>scritosos rasultados dm sallies porlutbarford Bach sssss arias<br />
Spectrometry (11S) dos p <strong>de</strong> Laterdifueio e reacio <strong>de</strong> Ease @aid ■ quo a-<br />
corn.m as bieama<strong>da</strong>s Fe/A1 (1000 A Is. 3000 X Al mobs, silicio oai<strong>da</strong>do) gained°<br />
submeti<strong>da</strong>s a tratamento tirmico em foram. stature par bombar<strong>de</strong>amamto Jamie°<br />
("Ion Beam Hieing") s i combinecio @homilies,a <strong>de</strong>ems dots tipo. <strong>de</strong> traumata<br />
metalareleo. Os resulted°s em forno indium quo a difueio 4. Po em Al Leticia<br />
em = 510 1 1. 1 tondo-se obtAdo dues difusivi<strong>da</strong><strong>de</strong>u 11 1.2.2 10" sap ( -0.93 e9/ki)<br />
CM .s e D .1.1 m 10- amp (-0.33 sViki)cm.s- . A difusio <strong>de</strong> Al am Is Geller@<br />
2<br />
a weir <strong>de</strong> temperatures um poueo male ileva<strong>da</strong>s (%600 K) e d condicio nocessi-<br />
/la pars a o t is <strong>de</strong> tttt io coo f - <strong>de</strong> um ■ fame latermtilica. Rotes<br />
resulted°s ■ io confronted°s cos os obtido ■ pare amo ttttt ■ubmatidm ■ s bombard°<br />
5.010 ionic..<br />
NET/10:;5/6A F1<br />
lb. <strong>de</strong> am<br />
lone.<br />
INTSIDLIOSA0 S RSAKAO IN ILCAMADAS Is/Al II: Resiselvilla<strong>de</strong> do fo-<br />
<strong>de</strong>s tenni to em forno o bombar<strong>de</strong>s<strong>da</strong> ■ coo !sixes <strong>de</strong><br />
S .R.Teizetra. 10 .11.1eLonimio, K.A.Z.V Los, V.S.Schreinar 1.J.K.11 1<br />
(UFICS); R.I. dm SiLvaira100C-RJ).<br />
Neste trabalho inventigamos exprimoutslmente o process° do Laterdifusio<br />
maples <strong>de</strong> fase solids quo acorns, ma bicama<strong>da</strong> Fe-Al, ■ ubmetid ■ a<br />
inhumane° tOrmico am loin°, ml rrrrr por bombard aaaaa to com Lana (" Ion Beam<br />
Mixing") i combiemcio simul - <strong>de</strong>ems <strong>de</strong>i ■ tipo dm minimalist°. ■atalingi-<br />
cos, <strong>da</strong> laical elitrica. Os resulted°. <strong>de</strong>s undid.. do reelect-<br />
vi<strong>da</strong><strong>de</strong> <strong>de</strong> folha parmitem umm <strong>de</strong>scricao qualleseias do process° do difusio s<br />
d form ' meteldrolea ■ do ileum. Fe -Al quo oeorrem pm aaaa io <strong>de</strong> fa-<br />
me solids <strong>de</strong>vido ao tratsmanto tirmico. Imogene <strong>de</strong> microscopic eletrOnico do<br />
dorm penalties ■ a ob - <strong>da</strong>m form ' is superficial ■<br />
nom condies <strong>de</strong> audience@ dristicas nom valor. ■ <strong>de</strong> ' ivi<strong>da</strong><strong>de</strong> <strong>de</strong> folha.
11111101FUSA0 E KEACAO KM BICAMADAS Fe/A1 111: I<strong>de</strong>ntificario <strong>de</strong> ■<br />
fosse formd per tressed:ate termite am Lorne a pot m per bonliar<strong>de</strong>asento<br />
fault°.<br />
S.R.Teineira, M.A.E.Vsecoscelea. W.H.Schreimar 1<br />
(MKS); C.A.S.dos Santos (0,411).<br />
Neste trabalho, proceds-ss i i<strong>de</strong>ntificagie dos lases intermetilices<br />
(arma<strong>da</strong>s per mato tie foss solid sutra os compensates <strong>de</strong> bicama<strong>da</strong> ■ Fe/Al.<br />
(wa<strong>de</strong> submati<strong>da</strong> ■ ■ tretananto tirmico es Lorne ■ mister per bombr<strong>de</strong>amento<br />
hinieo (ion Beam Hieing): Como ticnicse <strong>de</strong> aniline, est:area-se a difracio<br />
Rios-I a Ispectroseopia Milesbeuer <strong>de</strong> Mistress <strong>de</strong> Conversio (CMS). Mae ssperiincias<br />
tom Porno, verificou-s oc rrr rr is <strong>de</strong> dole tipoa do reacio. Um<br />
°corr ■ temperatures <strong>de</strong>eds 600 It ate 'baize d 650 K rasolta no fora° <strong>de</strong><br />
Fe,A1.. Outer: tipo <strong>de</strong> reacio scorea pantie <strong>de</strong> 650 K usuita no f ccccc io <strong>de</strong><br />
J. listaentivel 'sill 6' Algona resultadoe proliminsres tom emostras rrrrr <strong>da</strong>s par<br />
bombard/memento Mace sae latrpratados em conzio con os resulted°, do forgo.<br />
IRrIMPTIO<br />
PUR1FICA170 1112110LETICA D3 Mew<br />
Renato F. Jardia e Cliudio Santos - IFC( - =EN - MAW<br />
As impurexas substitution's in um@ matrix <strong>de</strong> Alibi°. The nio podma ser removi<strong>da</strong>s per<br />
"fusio por zone. Fels hi evaporacio preferential do Maio. ocesionando um enriquecimento <strong>de</strong>'<br />
Ta e W. COnsequentemente. a "fusio For zone „ necessite ser precedi<strong>da</strong> per uma purifitagio<br />
pule qual Te e W po<strong>de</strong>m ser removidos. in enriquecimento essential <strong>de</strong> outras 'murexes<br />
Com este cbjetivo. escolhemos a ease's. in sais fundidos per mnresenter virus vents-<br />
gens. intro alas. a <strong>de</strong> se obter 0 produto final no estado con<strong>de</strong>nsed°. na forma comacta<strong>da</strong> e<br />
cam constituicio praticamente contents.<br />
Sio spresentedos resultdos metalogrifboos dos mostras °bugles. bum coop us <strong>de</strong>termina-<br />
cies dos impurezas obti<strong>da</strong>s pelo mitodo do ativacio <strong>de</strong> neutrons.<br />
(Trabelbo percialmente finenciado polo FAPESP)<br />
UM ESTUDO MOSSBAUER DO SUMMIT° PUTINGA. J.C.P. <strong>de</strong> Oliveira<br />
po epartamento <strong>de</strong> Ffs1ce - UFO. A. lam (Institute <strong>de</strong> Tsice VRES . A.<br />
vsenber instituto <strong>de</strong> Geoclenttas - 5) e le. _ vielra r. J (1nst WO <strong>de</strong> -Geoc<br />
enc as - UFRS51.<br />
0 meteorito Putinge. classificado collo um condrito. ordinirio L6. fel objeto<br />
<strong>de</strong> estudo pela espectroscopla MOssbauer.<br />
A amostra fel separa<strong>da</strong> em dues ?reties: magnitita a nio-malnitica. Os minerals<br />
<strong>da</strong> 'ratio nio-magnitica. e sues quant1<strong>da</strong><strong>de</strong>s, a artlr <strong>de</strong>s areas relatives.<br />
foram <strong>de</strong>terminados: olivine (39%), ortopiroxeno (29%. troilita (25%), taeolte<br />
paramagnetic. (6%), e um composto <strong>de</strong>sconhecido <strong>de</strong> Fe ; (1%). A fracio maynitice<br />
mostra a presence <strong>de</strong> kamacita (75%) junto a minerals pertencentes i fracao niomagnitica<br />
(25%). em ratio <strong>de</strong> nio ter sido obtldo o grau <strong>de</strong> liberalizacio i<strong>de</strong>al.<br />
Os parimetros MOSSbauer foram <strong>de</strong>terminados nas temperatures <strong>de</strong> 300 K e SO K<br />
pare todos os constituintes do meteorite Putinge. Estes parimetros concor<strong>da</strong>m ben<br />
con os valores constantes ne literature.<br />
E sugerido qua o composto <strong>de</strong> Fe 3 tem origem na oxi<strong>da</strong>cio <strong>da</strong> amostra na atmos<br />
fora terrestre.
NET/11:55/6A.FI MOLISE PON SSPECTNOSCOPIA NOSSBAUER DO KETEORITO NOVA PETROPOLIS<br />
(.Sousa Acevedo. R.S.Scorzelll. J.Danon (Centro lirssileiro <strong>de</strong> Pesquisas <strong>Fisica</strong>s)e<br />
S auccoloto 40bseryatorlo <strong>Nacional</strong>).<br />
0 meteorite Nova Petropolis sofre um violent° process° <strong>de</strong> omi<strong>da</strong>ilo. Observe -se<br />
uma curious' su<strong>da</strong>cio <strong>de</strong> um liquido esver<strong>de</strong>ado que se cristalisa na superfIcie on<br />
contato cam o ar. provocando a formacio excessiyamente ripi<strong>da</strong> <strong>de</strong> cama<strong>da</strong>s <strong>de</strong> Oxi<strong>de</strong><br />
superpostss em creates facilmente removivels. A aniline NOsebauer <strong>de</strong> uma lamella<br />
natural muito pouco oxl<strong>da</strong><strong>da</strong> mostrou 151 <strong>de</strong> fare a magnitics. 621 <strong>de</strong> fame y-Ftei<br />
magnitica rice em Ni.201 <strong>de</strong> face y paramagn6tica(430111i)e 31<strong>de</strong>oxido <strong>de</strong> form. 0<br />
@spectre Rassbauer <strong>da</strong> create oxi<strong>da</strong><strong>da</strong>prOximaa essa lamella apresenta par ./metros<br />
biperfinos correspon<strong>de</strong>nts* ao y-PeO0R. 0 espectro NOssbauer <strong>da</strong> lase taenita17-<br />
FeNI.FCC)separs<strong>da</strong> quimicsmente reyelou 72% do y-FeNi <strong>de</strong>sor<strong>de</strong>na<strong>da</strong>,q. 7% <strong>de</strong> Pali SO/<br />
50 or<strong>de</strong>na<strong>da</strong>.401 <strong>de</strong> y-FeNi paramagnitica e 271 <strong>de</strong> y-Fe0011. 0 liquido quiebrote<br />
do metal exibiu A temperature <strong>de</strong> 77a um espectro constituido <strong>de</strong> um dublete que<br />
nio <strong>de</strong>sdobra magneticsmente a temperature <strong>de</strong> 4.2R, atribuido ao closet° ferrets°.
OTICA<br />
Coord.:- Ricardo Franrko (UFRGS)
011/8:00/4A.F I 111-ESTA111.10ADE 0T1CA ED GdA103;Cr . Evandro CVvaia (Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral<br />
<strong>de</strong> Alagoas). Tomas Cptun<strong>da</strong> S Joel's, C. Castro Nato (Iomtituto <strong>de</strong> 'erica s Quimica <strong>de</strong> Sio Carlos.<br />
usr).<br />
0 stoniest° <strong>de</strong> Gadolipeo dopado com creme ap um efeito.foto-refretivo extremment al<br />
t o(l). A orison <strong>de</strong>nse efeito esti aa difrsoga <strong>da</strong> polarisabili<strong>da</strong><strong>de</strong> do ion Cr'' nos *author fun<strong>da</strong>mental<br />
a meta- ' 1 ( 4 9). 0 '<strong>de</strong>lta fote-refrativo sparer@ portaeto. quaodo i altos in i<strong>da</strong><strong>de</strong>m<br />
lumina's' o estsdo meta-mstivel 6 populado e a polarizabili<strong>da</strong><strong>de</strong> do ion Cr° 3 i altered.. Fonommooka<br />
gicament efeito pods sir <strong>de</strong>scrito pets <strong>de</strong>/mediae:a do indite <strong>de</strong> rafragie cam ■ immosi<strong>da</strong><strong>de</strong><br />
u.nen2 I cads a kgrhscido came indica <strong>de</strong> refragio mi. linear. No caso do GdA10 3 :Ce 3 malifa<br />
e aperimental di u 2 1 " a do efeito <strong>de</strong> coojugagio <strong>de</strong> Lose per m' <strong>de</strong>genera<strong>da</strong> I mmure entail'',<br />
■ remultaios Instant, interessames relacioesdom cam o valor alto dm o ll" quasdo compare-<br />
do cos e uuuuu Oxi<strong>de</strong>. dopmdos cum cramp. Neste trabaiho esteems utilirmodo as proprie<strong>da</strong><strong>de</strong>s nip linear..<br />
do OdA103:Cr" par. realizar medi<strong>da</strong>s <strong>de</strong> bi-emtabili<strong>da</strong><strong>de</strong> O<strong>de</strong>s. Ss montages' experimental o<br />
cristal i colocsdo as ciaturs <strong>de</strong> um csvido<strong>de</strong> plena focal. 0 !gasses <strong>de</strong> bi-estabilidods ;Lica<br />
ocorr. <strong>de</strong>vido i =clangs <strong>de</strong> caminho chic° <strong>da</strong> los no interfeametro. a medid ■ qua iodic* <strong>de</strong> raftsgip<br />
do rascal so<strong>da</strong>. too<strong>de</strong>ole.o ioterferimetro es autocomesosar. come <strong>de</strong>scrlte oo so<strong>de</strong>lo tatirico pm<br />
ra bi-estabilids<strong>de</strong> Dries" ) . Resulted°. preliainere ■ Jo foram obtidos mostrae<strong>de</strong> os claps <strong>de</strong> Kg<br />
aracteristiess <strong>da</strong> bi-setabili<strong>da</strong><strong>de</strong>. Iodi<strong>de</strong>s <strong>de</strong>finitivas astlo san<strong>de</strong> realima<strong>de</strong>m.<br />
(I) T. Catun<strong>da</strong>. J.P. Asdrseem A J.C. Castro. Appl. Optics :al 2391 (1986).<br />
(2) T. Camo<strong>da</strong> I J.C. Castro. "Phase Coejugaciou io GdA10 3:Ce 3 aid Roby*. Babied*, ao Optics<br />
Commun. sat/E6.<br />
(3) M.D. Gibbs. 'Optical Bistability: Controllioe Light with Light' ed. Aca<strong>de</strong>mic Prams, Inc (1985)<br />
OT1/11:20/tA F TA rIsicA DAS IV8TA3IIJO8DS2 27/CAS<br />
A.G. VIrenti 1 (Dept°. ds <strong>Fisica</strong> <strong>da</strong> PUC/R3)<br />
Foram estu<strong>da</strong><strong>da</strong>s inotabili<strong>da</strong><strong>de</strong>s quo apart's= em blesbabili<strong>da</strong><strong>de</strong> &Acme<br />
atravfis <strong>da</strong> aniline <strong>da</strong> propsoacio <strong>de</strong> =<strong>de</strong>s num male nio linear. 2 sabido quo uma<br />
on<strong>da</strong> propagante pod, apresentar ganho parematrIco quando o mein se tarns setsradod<br />
sendo este o motivo polo qual os mo<strong>de</strong>m <strong>da</strong> oavi<strong>da</strong><strong>de</strong> pods. set amplificados e r<br />
obtemoa dodos j2<br />
conmeqfientemente, produslr instabili<strong>da</strong><strong>de</strong>s. Cam eats matodo<br />
conbacidos e coma os pontos <strong>de</strong> bituroscio 6tica, cos a vantages do garantirmoa<br />
suss interpretagass Lulea.. CIsmitodo pods mar aplicado a Inetabill<strong>da</strong><strong>de</strong>s <strong>de</strong><br />
lasers a o trabalbo esti em an<strong>da</strong>mento. prevaado-sa estu<strong>da</strong>r a estatlatica do<br />
campo <strong>de</strong> emissio.<br />
011/8:A0/4A.F IDEPIINDENCIA DOS ESPICTIO8 RAMAN It CONSTANTS DIRLgTRICA DO EDP CON<br />
PRESSIO UNIAXIAL - 8.0.C.Moreir 61 .7.11.A.Xelo.J.Men<strong>de</strong>m ■ilho,F.A.<br />
Germano e J.E.C.Koreirm.,<br />
'stamps estu<strong>da</strong>udo a <strong>de</strong>pendSeeie dos asp Osman a ttttttttt diet:-<br />
erica do EDP tom a pressio uniazial, waista a perpendicular so size c. as vi -<br />
✓iam tempera t baixo a ■ei.. <strong>de</strong> temp <strong>de</strong> traosigio fersoslitrlea 'No-<br />
ma- erica (T el ■ 1220. tom o objetivo <strong>de</strong> eutoo<strong>de</strong>rmos Bathos a participagio dos<br />
"tices ■ tivos no Raman ass trausigie ■ <strong>de</strong> fame estr uuuuu is quo scouter*,<br />
no EDP am <strong>de</strong> 901. 122E e 4739 e os movimentos do mu<strong>da</strong>oge <strong>de</strong> @Wo ■ dos four<br />
1<br />
moleculsres PO dolma elates traosigiiem.<br />
4<br />
* Department° <strong>de</strong> Piedra dm OPP..
011/9:00/40.F I TRANSFERINCIA DE ENERCIA ENTRE 10NS DE PR34 Ell VIDEOS BORATOS. Olio N. Pacheco<br />
Cid S. <strong>de</strong> Araujo. Deportment° <strong>de</strong> Frites, 011E, 50.000 Recife, Pt.<br />
Neste trabalbo estu<strong>de</strong>mos feitos <strong>de</strong> trans! - is <strong>de</strong> gargle on widros boratos (0.7 11203 -<br />
0.3 Ca12) contend° pequenas con awns <strong>de</strong> PO* (0.5 a 31). Noe wirlos canoe inwestiados a<br />
e ncita<strong>da</strong> a transisio 34(1)02 do Pr3+ pars estu<strong>da</strong>rmos a floorage:nolo assonance 102+34 e a<br />
fluorescancia anti-Stokes correspon<strong>de</strong>nts : transisio 3P°43114. Etta Ultima Iesults do on prate's°<br />
<strong>de</strong> cavern:a ascen<strong>de</strong>nts do qual participam 'Enchainment@ <strong>da</strong>is Cons <strong>de</strong> Fr a * (1). A fluorescincia<br />
ressonante aresenta ignites d2 estreitsmento <strong>de</strong> lighs par* difereutes frequenting <strong>de</strong> endless:a<br />
<strong>de</strong>utro <strong>da</strong> Hubs inhomosesea 3N4*102. Pow outro lado, a evolusio temporal <strong>da</strong> fluoracenci ■<br />
apressnts <strong>de</strong>snos on alai° ao <strong>de</strong>calmento exponential memo pars amostras fracsmente dopa<strong>da</strong>s<br />
(IE <strong>de</strong> Pr 34). Estasom ■tualmente procurendo carateriar o potencial <strong>de</strong> in sic entre ns Lou.<br />
<strong>de</strong> Pr3* usando diferemes =<strong>de</strong>lay existences na Li (2,3).<br />
(1) R. Nissan e J.C. Vial, J. Phys. Lett. 42, LI15 (1961)<br />
(2) V. Lupei, A. Won, S. Ceorgescu e C. Illescu, Opt. Comm. 60, 59 (1966)<br />
(3) Laser Spectroscopy of Solids ed. par O.K. Tan e P.R. Saltier (Springer, 1911)<br />
WI/9:20/14.F'' ISTUDO ESPECTIVISCOSCOPICO DE TILIO ATOMICO PRODUZIDO POI( EVAPORACAO CATODICA.<br />
LOCIA PRA00. (Ins <strong>da</strong> Paquisas Enecriticas Rol - IPRO/CNEN/SP).<br />
Foram realigados escudos praliminareg <strong>de</strong> Ilnhas <strong>de</strong> emissio <strong>de</strong> limpa<strong>da</strong>s do<br />
catodo oca <strong>de</strong> alio prepara<strong>da</strong>s on no's° laborateirio. Estamos seora efetuando experiinci ■ envoi<br />
wend° ■ aspectroscopi ■ <strong>de</strong> mbarcio <strong>de</strong>ssas limpa<strong>da</strong>s per intermidio do efeito optogalvinico. Para<br />
induce° <strong>de</strong>sse feito estamos utiligando inIcialant Sontag <strong>de</strong> lua convencians, a fim <strong>de</strong> wed.<br />
Hear ■ capons do sista, no tocants i intemi<strong>da</strong><strong>de</strong> <strong>de</strong> sinal optosalvinico obcido e compare -1°<br />
cm a resposta <strong>de</strong> um. lempa<strong>da</strong> <strong>de</strong> catodo oco do aloha martial auhmeti<strong>da</strong> is mamas condicies do<br />
ccc i aa gen. Gm asses <strong>da</strong><strong>da</strong> preten<strong>de</strong>mos analisar a wichili<strong>da</strong><strong>de</strong> <strong>de</strong> se <strong>de</strong>tector o efeito optoonve<br />
nico em limped.' <strong>de</strong> cilia, indusido par gio coo laser puha°.<br />
OTI/9:40/411.F 1 ESPALNAMENTO BARAN A FREQUIENCIAS !INTO DAMS EM TIMMS DE comrosigAo 211a20-<br />
Ca0-35i0, CON NICROCUSTALITOS. Erwin° Carlos Zifath e Andr4 Aenerter. Institut° <strong>de</strong><br />
<strong>Fisica</strong> eQuimica <strong>de</strong> Sip Carlos - Vnivetsi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paolo. Ca. Pastel 369, 13560 Sic Carlos. SP.<br />
Subatidos trstamento tire:leo apropriado, vidros con composis:o estequime<br />
trice INa0-00-3SiO, nuclei= formsndo ' litos gfericos cam a megma coeposicio qua a matrix<br />
witrea. Eletuana =lido ■ <strong>de</strong> small:mato Rama em ono mmmmm contend° divers°. tamanha <strong>de</strong> micro-<br />
' Lite. obsaramos o saran:ant° <strong>de</strong> on pica par. frog " ' Ramon =alto baisas. 0 Nisi=<br />
dusts pico afro <strong>de</strong>olocamento no frquincia coo o i do Lama° dos cristalitos. sus °ri-<br />
ses 4 stribui<strong>da</strong> son modos vibr d ■ superficie dos p ' lam. Pesquisa suhvencions<strong>da</strong> pole<br />
FAPESP. MEP e COPq.
nTI/j0:15/4E.FIESPALHANINTO RAMAN ROTACIONAL ESTIMULADO EN PARA- HIDROGENIO.<br />
evaldo J. Corot, Vladimir Jesus Trove Airoldi (Institute <strong>de</strong> Estudos Avangados -<br />
Cfill,i3aseaccs Campos, SP) e Cesar C. Glasoni (Institute <strong>de</strong> Pesquisas Rope<br />
cipis, Sio Jose dos Campos, SP).<br />
'A transigio rotacional S(D) do pars-hidroqinio tem se momtrado um boo sin<br />
terra para estudo do empalhamento Raman estimulado, pol ■ coo o bombearoento por<br />
lamer TEA <strong>de</strong> CO2 obtem-se o primeiro <strong>de</strong>alocamento Stokes entre 13 e 17um quase<br />
sem influencia <strong>de</strong> seraglio <strong>da</strong> sequn<strong>da</strong> Stokes, <strong>de</strong>vido a <strong>de</strong>pendincia do ganho no In<br />
verso do comprimento do on<strong>da</strong> cored*, sem s Ionia° <strong>da</strong> anti-Stokes, inibl<strong>da</strong> span<br />
do o bombeammnto a felt° coo reidiagS° circularment polarisads, sem competigio<br />
coo outran efeitos n&o linaares, <strong>de</strong>vido i balsa suscetibili<strong>da</strong><strong>de</strong> <strong>de</strong>stes no bids*<br />
ginio. Outro aspect* interessante i o fato do tempo <strong>de</strong> <strong>de</strong>fasamento do meio sir<br />
relstivamente grand., permitindo um estudo dos efeitos dos transitarlo ■ na gera<br />
gio, memo coo a <strong>de</strong>plegio <strong>da</strong> bamboo.<br />
Naito trabalho nos apresentsmos os resultados experimentais a <strong>de</strong> ■ imula<br />
gip numiric <strong>de</strong> um colli<strong>de</strong>r <strong>de</strong> radiacio entre 13 e 17um, polo espalhamento Raman<br />
rotacional estimulado em para-hidroqinio. cos bombeamento per laser <strong>de</strong> CO2. Es<br />
ten resultsdos compreen<strong>de</strong>m um mitodo <strong>de</strong> obtengdo do ganho <strong>de</strong> condo plane a partir<br />
<strong>da</strong>m medidcs exporrimentais, uma simulegio numerics do process* levando em consi<strong>de</strong><br />
ragio o tempo <strong>de</strong> <strong>de</strong>fasamento do meio, a uma avalisgio do efeito <strong>da</strong> injegio <strong>de</strong><br />
uma Emmert. na frecillincia Stokes pars ■er amplifica<strong>da</strong> nests Nebo.<br />
Ort/10,5/OA. CONJUGACAO DS FARS ATOROS OS RYDBERG. Torres Catundg, Tara G. Cabot°, Aggaz<br />
au. Noteellos A Jarboe C. Castro Mem (lommituto <strong>de</strong> <strong>Fisica</strong> pummics <strong>de</strong> Sao Carlos, OSP).<br />
buss sipsrancia visa o estudo <strong>de</strong> Conjogsgao <strong>de</strong> Faso per IC Degeosrads <strong>de</strong> Castro 0o-<br />
<strong>da</strong>m (CF11040) em itomos <strong>de</strong> Ns e cc i cc dos (somado ■ do Rydberg). On imams do Rydberg tim um comporta-<br />
memo muito peculiar Com aalagao a sun is gip coo a coeliac:is. Cota istaraglo Naito maim bate'<br />
a. porque coma campo atamico i pavane (o campo el' ' gum lig' a slitroo exclu<strong>de</strong> so oicleo)<br />
■ relsgao entre camp* <strong>de</strong> radisgao . o camps atamico i suite osier. Seto foto nos motivou a estu<strong>da</strong>r<br />
pole primeir ■ vas um efeito <strong>de</strong> Ones sip linear so :town dm Rydberg. A pesporegao dos esmado ■<br />
<strong>de</strong> Rydberg i tilts ■ at 000 o <strong>de</strong> <strong>da</strong>is Lamers <strong>de</strong> comae poleados, um mammal° s o utro maul. 0 priori<br />
' ado na linbs D do Na (3S-3P) s o segued° portant°, mums mrosiglo do tip° 3P -<br />
a" 9-11 (S ou D). Rotes lasers <strong>de</strong> bombeados polo 2' hankie° (A ■ 532m) a 39 barmaoi-<br />
Co (A. Mum) do loser Nd:YAG. 0 viper <strong>de</strong> Na i produndo num forme do tipo "boat-pips" quo permi-<br />
to chew ati T-500C (roman:rani° <strong>de</strong> Its -10 96 .tunas/ems). Amalmente *stamp@ trabalbsodo no ds-<br />
Larva° dos itomos <strong>de</strong> Na no nivel fantod° 0,-10. Ssesmos min<strong>de</strong> o mitodo <strong>de</strong> absorglo sties r o eitodo<br />
<strong>de</strong> <strong>de</strong>tecgao termoianics ("space-chrgedio<strong>de</strong> method') quo copilots is <strong>de</strong>tector tam ■ltsragao<br />
ne corrents <strong>de</strong> um diodo tetolinico divi<strong>de</strong> I p go do home <strong>de</strong> Rydberg. Inicilmonte protium's-<br />
OS fares ■ experianci ■ <strong>de</strong> ammo cam o haler SRO no. transigaes do tip. 3P - n-10. Pb ' men-<br />
te farms arta Impanel oo i o cam o less, <strong>de</strong> CO2 continuo num goo n.-10 -<br />
CITI/10:55/4A.FroKIMILACKS DA COMSTIOC20 DR =MOS DE COS PAM/ OM =MAIO OR OTILL<br />
ZOOS COMO M110 ATM DI LASES. Germano Voebl Jr! oOlisimo Sill Li (Initieuto di Fisic ■ s Poimica <strong>de</strong><br />
Sao Carlo., USP).<br />
. Um azemplo tipico <strong>de</strong> centre FA(II) é squeals qua parses no mantis <strong>de</strong> MCI ispurificsdo cm<br />
Li ecoplado a um centre F. Sstea ceotros possum proprie<strong>da</strong><strong>de</strong>a Caicos booesnes fsvocivois a obtssgio<br />
do efeit laser, <strong>de</strong>s<strong>da</strong> quo a 1 eeja mon<strong>de</strong> i balsa temps . Taos <strong>de</strong>renvolvido um<br />
Leese quo 'minas antes cri aaa i o <strong>de</strong> KCI:Li" cos centres FA(II) comp silo stivo ■ o qual i bombedo<br />
per um loser <strong>de</strong> Ar' no linha di 51A no a cos pot:ari ■ <strong>de</strong> 700 I. A anionic no barman...lb. se di<br />
am 2,7u. Os cri aaa i a sip crescidos a coloridos on mosso. lsairterlos. A mil ' q ' aa do<br />
ennui <strong>de</strong>pend, do glo <strong>de</strong> cennos FOUL Si coucntrgiies altos hi formsga <strong>de</strong> agregados,<br />
em concentragies balsas o n ■ <strong>de</strong> ikons absorvidos ' mind°. i moons. COnsequentemonts astasdoia<br />
[stores cootribuem pars' um baize g.nho do solo stivo. Pissed* obter masima do lam,<br />
<strong>de</strong>terminsmos a 000000 :raga° him <strong>de</strong> matron F A(I1). Piro obtengio Ilona otimisoglo, caesium-se o<br />
laser corn instals do diversa ■ ccccc onsgaes do centres PA(lt). 0 Ousts <strong>da</strong> <strong>de</strong> potaucia <strong>de</strong><br />
, ai<strong>de</strong> goo <strong>de</strong> can permits dstarmiosr a =lbw gee qua foi <strong>de</strong> 6,3 n 10 97<br />
ccccc os r (11)/cm 9 . Co. sits cancan:map a anemi ■ energetics foi <strong>de</strong> 2,81 o interval* <strong>de</strong> alai<br />
Laois °bald. <strong>de</strong> 2,36 a 2,112 um. 0 ailment° do eficiancia conseguido pals utilisagao <strong>de</strong> c c i ccc is cow<br />
a concenusgao otimisado <strong>de</strong> centros rA(11). aopliou as perspectives <strong>de</strong> aplicsgao do loser <strong>da</strong>ssovolvi<strong>de</strong>,<br />
em diversos problems' <strong>de</strong> espectroocopia. (rArcsr, CNN. MEP).<br />
En<strong>de</strong>rego steal: CTA-11Av - Div' <strong>de</strong> Laser
OTI/11:15/4A.9 EFEITO DA TENN:OMURA NO PROCESS° DE ALARCANENTO DAS TiANDOED RADIATIVAS NOS<br />
MUMTAIS I DO En' CONO DENUTO EN CNISTA1S IONICOS. Guido N. Lou.. g Jarbom C. Castro Nato (Ino -<br />
tient° Is <strong>Fisica</strong> a Osimeia <strong>de</strong> Sio Carlo., USP).<br />
Oa et/rites nio aam umamiglies rodistiva. no Boli<strong>de</strong>. cam <strong>de</strong>leitos,. tam <strong>da</strong>mpartado<br />
ba aaaaaa inters's. messes Ultimo. 10 !mom. particulormente a aboorcio <strong>de</strong> doffs ikons (TPA). Apeoar<br />
dm ticuica TPA ter lido amtansivamanta emprega<strong>da</strong> na <strong>Fisica</strong> Atimiea, momenta muito eeeeeee manta emtm<br />
' lei utilised. cam amass° no meted° <strong>de</strong> t "sa<strong>da</strong>. or " iinicom. No<br />
case particular <strong>da</strong>m aaaaa isacm 41 7( 118,,z) [ 7 ( 6P1 ) end. J. 2/2, S/2, 7/2; o dr/aliment. pod. °cos.<br />
car via umm ■imtura <strong>da</strong>m lungie ■ <strong>de</strong> Nun 41 1 a 41 73d0 , .undo que site ultimo estado <strong>de</strong>cal per um<br />
fiton. En cri ttt i t ifinicom cost simetrie Oh dopado coo tttt ■ ears laniard*, o process° rasps " 1<br />
par. assn m' divest mar anon. fipticoo lomaitudinsim qua d ■ a aimmula local do campo<br />
crimcolino. En halogenates ■lcalinos. tipo Nadi. KCI, etc a vacincie oeuvre p do ladb do<br />
contra <strong>de</strong> tor, Ji qualm. aimmtria local do carpe eriatalino. Poe ease motivo fi <strong>de</strong> as emperor.<br />
conforms o mo<strong>de</strong>l° propo.to. um eomportamento instant. d' o <strong>de</strong> ails° <strong>de</strong> temperatura um. lotion'.<br />
dm limbo* <strong>de</strong> Cu" nom halogenate,. m Nuoratom ■ lcalinom. (C1114, FINEP. FAIMSP).<br />
(ITP11:35/aA.F arrun<strong>da</strong> Di AGLONERADOS DC OH EN KC1 USANDO DOAS TECNICAS: ITC (COIRENTE TER-<br />
NOISTINULADA) E EIVD (ESPECTIOSCOPIA DE TRANSFORHADA DE FOURIER NO INFRAVENNELRO DISTASTE). Li<strong>da</strong><br />
go Olivairagllisimo Sin Li (Institute <strong>de</strong> P . Quinics do Sio Carlo.. USP).<br />
Jimmie <strong>da</strong>ms.. duaa tienicam amparimantai ■ pod's°. obaervor om mo<strong>de</strong>m do vibracio a a salamisip<br />
dislitrica dos aoloarrado. <strong>de</strong> ON- no ICI. Es trabalbom privies Foi observed° scram:. dim wadi<strong>da</strong><br />
par<strong>da</strong> dielitrica. picom <strong>de</strong> ralamagio es 66E (pica A). 11.21 (pico 2.91 (pico C), a uma frg<br />
quinci ■ <strong>de</strong> 4:10 8 Na. Com luta. medi<strong>da</strong>o utiIimando o valor <strong>de</strong> tempo <strong>de</strong> relamagio no pico, <strong>da</strong> moo<br />
era ECI:Ca" ■ obtido fel ■ cornet ■ termaamtinole<strong>da</strong>..podmoom notion um& comparator. (211E) do ocor -<br />
cinch. do pico A no metodo do ITC. Somme iateromea a obaervaelo <strong>de</strong>n. pieo A, poi. eats a o que<br />
maim as aproaimm is condie is* as quaffs nom permit= veriticar o men comportamento a<br />
Nadir a ralazacio dialfitrica 'troves do corrugate dm <strong>de</strong>mpolarimagio Lormoestioula<strong>da</strong> acompanba<strong>da</strong> tog<br />
bin <strong>de</strong> median <strong>de</strong> abaozgie &Lica.<br />
Referenci ■<br />
R.C. Patter I A.C. An<strong>de</strong>rson. Phys. Rev. Ea, 677 (1911).<br />
OTI/11:55/4A.F 3<br />
CARACTERIZACA° DO ESTADO MHO f 0_ ( P...) DA NOLECULA DE 1000<br />
CON TECN1CA DE DUPLA RESSONANC1A. Janis' S. Hickmann,vElialla Fernando!, Helena LIbardi<br />
e Ricardo E. Franck,. (InstiVVEN-di do 1110<br />
drcEirr- -------<br />
Os esto<strong>de</strong>s ionicos <strong>da</strong> molicula <strong>de</strong> co<strong>da</strong> sic <strong>de</strong> interesse fun<strong>da</strong>dmental. ji que<br />
sum curve <strong>de</strong> potential pods sir estu<strong>da</strong><strong>da</strong> cos gran<strong>de</strong> <strong>de</strong>telhe, <strong>de</strong>vido a seu elevado<br />
peso molecular. Tambov' sio <strong>de</strong> interesse pritico torque alguns <strong>de</strong>les estio envolvi<br />
dos em trassicoes lasers. 0 <strong>de</strong>senvolvimento dm tecnica <strong>de</strong> dupla ressonincia corn -<br />
lasers estimulou suitos traballios nests Area. Em nosso laboratArio foi <strong>de</strong>scoberto<br />
Clue laser <strong>de</strong> oltraginle (337 nm) tem ressgnancias aci<strong>de</strong>ntais entre o estado 11 4 x e<br />
um <strong>de</strong>sSes estado ionicos: o estado f 0: ( 3 1,..). Este fato abre diversas possibili.<br />
<strong>da</strong><strong>da</strong>& experimentais. ja que estes expellimenVos combines a seletivi<strong>da</strong><strong>de</strong> <strong>da</strong> tecnice<br />
<strong>de</strong> dupla ressonincia. cos a alto potencia caracterTstica <strong>de</strong> lasers moleculares <strong>de</strong><br />
freq0encia fixa.<br />
No presents trabelho, foram i<strong>de</strong>ntiflca<strong>da</strong>s algumes linhas do laser <strong>de</strong> nitrogenie<br />
responsiveis pelas ressonincias aci<strong>de</strong>ntais. bum comp os nimeros quinticos<br />
dos transicOes correspon<strong>de</strong>ntes induzi<strong>da</strong>s na molicula <strong>de</strong> iodo. Como um exemplo,<br />
sencionasos qua a linha P'(7) do laser <strong>de</strong> nitroginio isduz a transicio (16-1, 119<br />
(2-16) P(30) no iodo l A iDentificacio <strong>de</strong> algumas <strong>de</strong>stas ressonincias permltia<br />
resolver up discrepancla no literature sobre as constant's espectrosc5picas do<br />
estado f o qual era <strong>de</strong>scrita por dois conjuntos <strong>de</strong> constants; thcompativeis<br />
entre si. v
OTI/9:00/5A.F 1 RECOBRIKENTOS OPTICOS: TRATAKENTOS PRE-DEPOS100. Roberto N.<br />
<strong>de</strong> Agosto e Flute Horowitz (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFRGS - 90049 Porto Alegre, RS<br />
A confeccio <strong>de</strong> filmes fines tom boa a<strong>de</strong>rincia a quali<strong>da</strong><strong>de</strong> tanka durivel prei<br />
supie substrates isentos <strong>de</strong> <strong>de</strong>feitos mecinicos a contaminacio. hosts sentido. for<br />
instalado no setor <strong>de</strong> <strong>de</strong>posicio <strong>de</strong> filmes, com pressio positive...um -sisteme pars<br />
controle do temperature, umi<strong>da</strong><strong>de</strong> a filtragem <strong>de</strong> particulas <strong>de</strong> ate 5 um (po<strong>de</strong>ndo<br />
ser estendi<strong>da</strong> pars freckles <strong>de</strong> um).<br />
Previamente i <strong>de</strong>posicio, os substrates <strong>de</strong> boa conformacio mecinica <strong>de</strong>vem pas<br />
sir por um process <strong>de</strong> <strong>de</strong>scontaminacio, cuja sistemitica <strong>de</strong>veri resultar <strong>da</strong> avalT<br />
acio comparative <strong>da</strong>s seguintes ticnicas: banhos em <strong>de</strong>tergentos sums, alcool iso<br />
propilico (liquido/vapor), pito <strong>de</strong> freon CO 2 . muffles do nposicio a ozinio<br />
luz UV ou ions 0 - .<br />
Esti em n<strong>da</strong>mento a construcio <strong>de</strong> um microambiente limpo em que a selecio <strong>de</strong><br />
materials i critica <strong>de</strong>vido alta capaci<strong>da</strong><strong>de</strong> solvente do freon. Para a evaliacio<br />
<strong>de</strong> quali<strong>da</strong><strong>de</strong> estio previstos a contegem <strong>de</strong> particulas filtra<strong>da</strong>s no ■ icroambiente,<br />
testes <strong>de</strong> simulacio <strong>da</strong> influincia ambiental, medi<strong>da</strong>s <strong>de</strong> espalhamento <strong>de</strong> luz e<br />
elipsometrla <strong>de</strong> superficies.<br />
(Parcialmente financiado polo CNPq)<br />
011/5:20/5A.FI L1TOCRAFIA OPTIC* 111111-111CROE<br />
Cerel<strong>de</strong> P. Men<strong>de</strong>n, Lucile R. Cascara s Jaime FreAych<br />
Universi<strong>da</strong><strong>de</strong> Eseadual <strong>de</strong> Compinas<br />
O Iveu-se no laborearis ems Itiottlem pursuant, Optics que permit. miser°<br />
em filmes <strong>de</strong> gatecrash's! <strong>de</strong> esertteuras periOdicas (ro<strong>de</strong>o) eon lichee<br />
que 1 um a <strong>de</strong>limiter. eamparivel se Mahar quo a qua po<strong>de</strong> per °bei<strong>de</strong> corn<br />
g leams beam.<br />
Ess ■ escaologi ■ Poi <strong>de</strong>seavolvi<strong>da</strong> visaed° a transfer:acts <strong>de</strong>sses Walls Perildied, pare substrate<br />
. (vidre on semisen<strong>da</strong>tersa) !mon<strong>de</strong> or Ms' do to ins comp mho<br />
cars. As aplicagoes imediates ■ aos Cabricageo <strong>de</strong> compensates bologrifices s laser<br />
semicoodueer do tips DPI u 'Optics inesgrs<strong>da</strong> so aural.<br />
011/5:40/5A.F eszaeluzagIo DE LAIRS OE Ils-Os MATES DE EFIlITO E1LEMAM.<br />
e 84reio C. eilio (Institute do ■isica a goimica dm lap Eatit liaMb<br />
Cetus. estsbilisaado se laser <strong>de</strong> se-Ile oacioaal, eipo solo <strong>de</strong>r ■ agen<strong>da</strong> a betimeoto <strong>de</strong>ri<strong>de</strong><br />
no eleite lemma p ado par on tempo main:tics extern ens limbos do osinio. A frequiaci <strong>de</strong> ba -<br />
tisane° <strong>de</strong>pend, do tamanho <strong>de</strong> cavidpila i minima gonads um dos mo<strong>de</strong>s do ressonadr tt i 000 no contra<br />
ds curve <strong>de</strong> who do meio 'sisal". 0 batimento i produsido per um tempo <strong>de</strong> IOC. gored. por on<br />
solenOi<strong>de</strong> envolvando o tuba. e sus frogs:pri ■ 4 ids em sisal <strong>de</strong> errs strovis <strong>de</strong> on slums<br />
digital compost <strong>de</strong> Schimitt trigger, cootador rrrrr sisal, fir gets. buffer memory c 00000 sor<br />
D/A. 0 sins' <strong>de</strong> erro aliment ■ on PET on aquecedor que 'meshing= o tammaho <strong>da</strong> cavi<strong>da</strong><strong>de</strong> cons.-<br />
quentemente frequencis <strong>de</strong> maids do laser. (C1114, PAPE8F).<br />
II) T. misr, F.V. Rovoleki A J.L. II.)). App). Opt. Mt, 3173 (1980).
0uj9:00/5A.F IESPECTROSCOPIA 1NTRACAVIDADE CON UM LASER DE CENTRO DE COR NA REMO DE Wpm.<br />
GERMANO MEHL M.'s MAXIMO SIU LI - [MC- USP.<br />
Realizamos medi<strong>da</strong>s <strong>de</strong> absorcio <strong>de</strong> uma Nostra coloca<strong>da</strong> IntracavI<strong>da</strong><strong>de</strong> <strong>de</strong> um laser <strong>de</strong> centro <strong>de</strong> car<br />
Intelramente <strong>de</strong>senvolvido no IFOSC , quo utlliza come mole atIvo um cristal <strong>de</strong> KC1:L1 cos cen-<br />
tres FA(11), que tambim fol crescido preparado nas <strong>de</strong>pendinclas <strong>de</strong>ste Instituto. A amostra que<br />
utillzamos foi um cristal <strong>de</strong> al impurifIcado coo NO2, NOi e Li', a qual apresenta um pico <strong>de</strong><br />
absorcio as 2.714um. Este pico sltua -se <strong>de</strong>ntro do Interval° <strong>de</strong> siatonla do laser.lom eats ticnIca<br />
<strong>de</strong> espectroscopta obtivemos uma amplificacio <strong>de</strong> 50 yeses na medi<strong>da</strong> <strong>de</strong> absorcio. Lima possTvel cau-<br />
sa <strong>de</strong>ste fator <strong>de</strong> amplIficacio dove-se a competicio <strong>de</strong> modos, uma viz que a sIntonla do laser fob<br />
felts cos um prisms, o qual permits a oscllacio slmultinea <strong>de</strong> multlmodos.<br />
Atualmente no CTA-IEAv-Divisio <strong>de</strong> Lasers<br />
" Revista <strong>de</strong> FTslca Aplica<strong>da</strong> e Instrumentacio Vol. 1 no 4<br />
Apia FInanceiro: FAPESP, FINEP e CMPq<br />
021/9:20/511.F ICAAACTERESTICAS DA RHISSA0 DS 11H LASER DE N2 DE DMA PRESSAD EH FUNCAD DE FARA-<br />
METROS DO C1ROJITO DE DESCARGA-SICUNDA PARTE. N. Into Fernan<strong>de</strong>m Filho, A. Di.. T Jr. e C. A.<br />
Massone. Lburstorio <strong>de</strong> Espectroscopio s Laser, Institute <strong>de</strong> <strong>Fisica</strong>, dniversi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral 'Flumare,<br />
CP 296, Niteroi, 24210 R.1.<br />
Poi ap ado anteriorconte (1-2) um mtudo sabre ■ influincia mss casette r oo ican do pulse<br />
<strong>de</strong> emissio (potincla Is pito, entree. e largura temporal) <strong>de</strong> in laser <strong>de</strong> N2 <strong>de</strong> baize pressio. <strong>de</strong><br />
lamina parimetros do ' i ' odor. Se apresenta agora in panorama complete <strong>de</strong> influincia<br />
<strong>de</strong>stss fatoris ends se tem esiu<strong>da</strong>do positio do "spark -gap"em relatio so canal <strong>de</strong> diescarga. geome-<br />
tria dos eletrodos. &seinen i letridica, comprimento do canal <strong>de</strong> d ga a frequincia <strong>de</strong><br />
remonancia do circuit° excitador. Os resultados mostram que, pare in <strong>da</strong><strong>da</strong> mo<strong>de</strong>lo <strong>de</strong> loser. as caracteristicas<br />
do polio laser amnion po<strong>de</strong>m sir modifica<strong>da</strong> ■ em ati una 505 con peguenas e simples,<br />
modification no circuit° ezeltador.<br />
Trahslho parcialmente financisdo per FINS! a CNFq<br />
1.- H. <strong>da</strong> Silva Reis. A. Dias Tavares Jr., C. A. Hasson e M. S. Z. Chagtai. J. of Physics E 19.<br />
471 (1956)<br />
2.- N. Hen<strong>de</strong>e Alves. A. Dias T Jr. a C. A. Massone. IX Incontro <strong>Nacional</strong> <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Matiria<br />
Coo<strong>de</strong>nsm<strong>da</strong>, OTI-22.(1966).<br />
0TZ/9:40/5cl F (CERACAO DI RADIACAO SINTONIZAVEL NO INFRAVERNELHO LONCTNQUO A PARTIR DR HIST0<br />
RA DE remotmcias. Elsa C.Crus Vasconcello ■ ( Inst. <strong>de</strong> <strong>Fisica</strong> - DEQ - UNICA* ).<br />
0 estudo <strong>de</strong> espectroacopie a laser na raga° do InfrEvermelho lunginquo (1VL), do espectro ele-<br />
tremsgnitico tem si<strong>de</strong> prejudicado pals ■ Una dm font. <strong>de</strong> rediagio sismaisivell amiss mills. 0<br />
<strong>de</strong>senvolvimento <strong>de</strong> 1 gis, principslments o ■ bonbeados oticaments tem eatimulado pesquisas<br />
cape "picas ns regiio IVL( ) ). E o ' p me ccccc <strong>de</strong> 100 links@ i nn faille <strong>de</strong><br />
100 i 600um, min ain<strong>da</strong> a eintonisasio <strong>de</strong>letes 1 pe ccccc a sspectroscopin po 1 SS TOS<br />
triage so estudo <strong>de</strong> linhas <strong>de</strong> absortio cam frequAncias muito praxis. ■ <strong>da</strong>s frests:nons <strong>da</strong>s linhas<br />
disposivels Is Isms.<br />
Proposes uma ionte PR. siacaniaival a plink' <strong>da</strong> mama (au subtragia) <strong>de</strong> rsdiatio <strong>de</strong> micro<br />
on<strong>da</strong>s ■ intonizivel, cam radiatio laser IVL diaponivil. A mi 00000 <strong>de</strong>ems. frequincias <strong>de</strong> radiatio sg<br />
ri fait ■ em diodos <strong>de</strong> cantata <strong>de</strong> ponts, mEM(Hetel -leonine -Metal) ou Schottky.<br />
E. prinapio ■eri possivel guar-se uma verredur ■ na mei° 'spectral <strong>de</strong> 0.STME i 4THs(6001im<br />
i 7Sum ).<br />
(1) Ticnica <strong>de</strong> Ressonincis Hagnitica coo Laser (LItE)
011/10:15/511.F IASS0100 DE DOES FUTONS FOR PARES DE ATOMS. L. Acioli, A.S.L. Comma, J.R. Rios<br />
Wive a Cid B. <strong>de</strong> Araujo. Departamento <strong>de</strong> "'isles - 111111.<br />
Diseutiremos raultados Leiria's pare as formal <strong>de</strong> Liebe spectral <strong>de</strong> absorsio <strong>de</strong> <strong>da</strong>is hitons<br />
par paces <strong>de</strong> itomos <strong>de</strong> doll trim nivel@ quintieos saten<strong>de</strong>ndo resultados obtIdos previamente<br />
(1). Seri discutid ■ a eonesio dos mo<strong>de</strong>les estu<strong>da</strong>dos coo "apartment°s realised°. on 'Gli<strong>de</strong>s<br />
(2) e vaporer &agleam (3). Novas OfeiROS preeistes 110. CilCulOS series mall:Ado' cam 0.111011 ■<br />
futures eaperimentoa.<br />
(1) J.R. Rios Leite e Cid B. <strong>de</strong> Araujo, Chem. Phys. Lett. 13, 71 (1980); A.S.L. Comes. Teem <strong>de</strong><br />
Mestredo - UFPE (1982)<br />
(2) J.C. viol R. Suleson, J. Phys. Lett. 43, L745 (1982);<br />
R. Masson, J.Q. Liu e J.C. vial, J. Physique 45. 1533 (1984)<br />
(3) J.C. White. Opt. Lett. 6, 242 (1981).<br />
err/10:35/58.f Esmoo EC 024PORTANENTO MANIC° DE UN OSCILADOR OR VAN DER POL<br />
Andrea Regina lard a Jason Alfredo Carlson Gallas,<br />
Departarento <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> IAA, 88049 Florisn6polis.<br />
Seguindo sugestio <strong>de</strong> Jorge A Lisboa (1F-UFR6), investigamos numericamente<br />
o comporteapto <strong>de</strong> um osciledor nio-linear <strong>de</strong> van <strong>de</strong>r Pol excitado par uma force externs peri6dica.<br />
Oobjetivo a i<strong>de</strong>ntifier a.naturesa <strong>de</strong> certas oscilacEes, eparentemente onto-indomi<strong>da</strong>s, on transsissores<br />
<strong>de</strong> radio.<br />
(Parcialmente financial° polo Cleq,08,AS a F1NEP)<br />
mmmmmmmummmiew<br />
071/10:55/511.F ABS0Rci0 DR RAIDS E EN ATOMOS NA passaiga OK CAXPOS INTI1NSOS DE<br />
LASERS NA APROZ1MAgIO DR SIOILT -BARRIS, A. L. A. FONSECA a A. c.ng<br />
WES OLIVEIRA - ORPARTAUNTO OR PIMA - UnI- 70910, BaAsILia- Dr<br />
A 'beeches <strong>de</strong> Riles I no itomo <strong>de</strong> Nidroginio ea presence <strong>de</strong> campus intim<br />
sop ■ <strong>de</strong> 1 aaaaa a sece<strong>de</strong>d& utilisaodo-se a eproximagio <strong>de</strong> Seely a Barris <strong>da</strong> Viola<br />
<strong>de</strong> Plasmas. Rota 'pro:lash° <strong>de</strong> eampo intense nos possibilit ■ <strong>de</strong>terminsho dire<br />
to a simples ds segies <strong>de</strong> cheque O. an a 000000 i<strong>de</strong><strong>de</strong> <strong>de</strong> empanel° em airless <strong>de</strong> pa<br />
tine's ou soluhes ■ssimtiticas sPiFica ■ ;Jousts. Emeontramos qua a z yeti' coy ,<br />
(c i proporcional a amplitu<strong>de</strong> do lime) no regime <strong>de</strong> campus i 0000000 a cow C no<br />
limit <strong>de</strong> eempos super in
OT1/11:15/5A.4 COSIODACOVII ROA A REALIZACIO OE LAI ISOM SillorOlVDOOLUD OD CAMPO CLE11101ACIarI0O<br />
Goulds A. Virtue o Muni Tones Maim<br />
Dipartinanto do Visits - ICAO - unc<br />
0 praxis* auk Fedora mar "Siouan do Ina", vela polo Motto dos asmoleacau op , sok per siatenas epticos<br />
<strong>de</strong> sulks altrusts moristledo se<br />
suss potemcialtdodom priticas.<br />
pm lolesras eutru possibllidodu prods' poles *suds* sabre a -mew is lux<br />
O pan<strong>de</strong>r Neal <strong>de</strong> ands <strong>de</strong>n ter o manor odds tutrloacs umbel, suds o laser ■ Amu do Imo yowl cos moor<br />
rola. use as rentuat (4(11) 1 C crtogio do mead's do uso can anodising <strong>de</strong> slum seb-polosealsos<br />
( (aids) s ( ) laud mar abjure dr cansi<strong>de</strong>rivot aurae sem prelalass use.<br />
tams murk& metedssao s pnemilillU<strong>de</strong> d reeltuais do so na<strong>da</strong> mm-potossalmoo <strong>de</strong> emu aerates do oe -oolatm<br />
slots' lalcialments. am laser (1 0 I Ilia) pro Oalaincencla parmoitrlea nista ft COS on<strong>de</strong> eelackmoom ex<br />
basso eakingolos A l 53222 12 ■ .2102 . Vote. fetus lack= Bur airman do CmAlCabo (lW) longitu<strong>de</strong> num<br />
coolant Marl-Perot. 0 Wotan dui saeliiales d Kit sates-se e .A l, a outdo& a ■totoulai<strong>da</strong> pun possaaeo do<br />
111=1 2. As Mammies do 14.f0. i<strong>de</strong>ntleas nos dots klomo. pe<strong>de</strong>nio armour warionis ■ no tranostookbado di malt<br />
Oh In 111111110 Imam so as mules& do mimer, per O<strong>de</strong>s. oh Moore. no 'Oscillator Strught" doe iuteltano.<br />
eststlaties at time original A l sea ondillem<strong>da</strong> ■ Negri !monitor Ma fells ermistiliSs no (4 (An t Car ).<br />
(V or tad& marnio d palni10<br />
O11/l1:35/5A.F I immursatmcu DE MUM 1000110A POI UN 1'61011. J.L. Duartita AWN. C. Gam-,<br />
tro mto (Institute <strong>de</strong> <strong>Fisica</strong> Quimies <strong>de</strong> Sao Carlow, OSP).<br />
A traneferineia <strong>de</strong> enersia coast ions em um .eli<strong>de</strong> morn <strong>de</strong>ri<strong>de</strong> i i via entre oa me-<br />
mos permits que um ion A gonads acitado pare <strong>de</strong>trminsdos olvois 00000 firm a mum enersi pars<br />
o ion ■ ludo o ion A pare um nivel <strong>de</strong> snare. maim liizo o items 1 pare um nivel mmi ■ alto. A<br />
proposte <strong>de</strong>nte trabalbo a eatu<strong>da</strong>z um maeaniamo <strong>de</strong> forineia <strong>de</strong> mersia diferente do. °bier -<br />
rad°. em gondol.. es qua a trasafrineia a induzi<strong>da</strong> per um snoods foto°, comp ilustrado us figura<br />
abaizo. Neste p 000000 o <strong>de</strong>a<strong>de</strong>r A o 'eva<strong>de</strong> ■ um estado 112> atravi ■ do abmorgao <strong>de</strong> um 10100 do<br />
frequiacis vi a untie o mist= 611 1401 observe um sesuodo feton <strong>de</strong> frequineia u2 levando o ion ■<br />
pars o eatado 1b2, e o ion A pare o ostado fun<strong>da</strong>mental leo. 0 siatms em eatudo e o crime.) <strong>de</strong><br />
alu ♦inato <strong>de</strong> sadolinso dopado cum ctomo (CdA103:Cr"), ends o ion A i o Cr" e o ion 11 o Cd".<br />
021/11:55/51LF<br />
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AlsoacKo AULTIP070111CA RESSONANTO EN CRISTAIS<br />
Gimette Jolbert. Delfts [pillar, N.S.Orandi N.taeury (Dpro.Fisice - PAC/RJ)<br />
Utillaa-tea o mitodo <strong>de</strong>e "bands. vemtidoe" pare stu<strong>da</strong>r o efelto <strong>de</strong> eatado ■<br />
intermedliries uaa tranallies multifoanicas en um casts'. A probabili<strong>da</strong>d <strong>de</strong> Um:sic:0<br />
snsivel a rssomincia ■ <strong>de</strong> estados intermedlirlos i fortement .fated. pole iotenei<strong>da</strong><br />
<strong>de</strong> do laser.
Oil/B:00/6M BIE1TO OPPOCALVIM1C0 IMMO POO LAMPAOA OE CANDO odo. Armando Mira ,<br />
(Institute <strong>de</strong> revisions Emergiticaa Muclares - ZPEO/CMEN P .<br />
Destroys:en mss eaperieocia cads form foie msdi<strong>da</strong>s do Gigot optogsleinits observado nag<br />
candies.. squints.: a) Circuit. donator contend° ums limpid. <strong>de</strong> meted° oco <strong>de</strong> cobra-naiad°, <strong>de</strong><br />
babes torrent.; b) Ezcitario faits pals let do is ■ egoods limpid& <strong>de</strong> cobra-organic/. <strong>de</strong> sits torrent..<br />
Os resaltados d sssss =Mos nostrum quo o sisal a ues Ewa* linear <strong>da</strong> intoosi<strong>da</strong>ds <strong>da</strong><br />
lux excitante. o qua sugars a possIbili<strong>da</strong>do <strong>de</strong> utilisatio <strong>de</strong>ss assume p.m a constracio <strong>de</strong> aqui<br />
pameato pars soiling <strong>de</strong> mseerisis.<br />
011/8:20/6A.r DESENVOLVIMEMTO DE RNA CAMERA PARA NOLOORAFIA.<br />
Jos§ J. Lunotti ■ UNICAMP<br />
MMIMM■RIN■101■■11<br />
Intro do projeto PAOGT-InstrumintecioCMPq estIo endo dosonvolvidos components. necionals pa<br />
re ume camera hologrifica, do mensira a anent. dpen<strong>de</strong>r ds fonts muse Ltmssrt s do films<br />
hologrAfico.<br />
Os prloalros componantos dossnvolvidos sea: on obturador remota pare laser a on fotemstro. Estee<br />
on foss <strong>de</strong> premero 02 sumortes macinicos. a moss, filtros especial. sspelhos s e divisor<br />
<strong>de</strong> filing. Soria emrssentados as primeiros protAticos JA construidos ■ <strong>de</strong>scrunseos suss =recto<br />
risticas.<br />
011/8:40,6R.F BOLOOMAPIA INTEEFIRONSTSICA EM TEMPO UAL UTILIZAMOO COMM<br />
FOTORRIFRATIVOE<br />
Paeto A.M. dos Santo! - Join. Frallist<br />
Oolversidsd Fe<strong>de</strong>ral Plaid Umivorei<strong>da</strong>ds Ests<strong>de</strong>al <strong>de</strong> Camping.<br />
A ado combined. <strong>da</strong> folocoodotivi<strong>de</strong>d <strong>de</strong> efelto letroOptice linear em cristsi<br />
fotorrefretivos results soma modolgs. do Audio. <strong>de</strong> rfwaca goo permit. dusts<br />
forms ralisar rgistros em tempo mil masses materials.<br />
Os cristai ■ Es goalie do 11112111020 sio morms1 o isotripicoe moo sob <strong>da</strong><br />
los consequent. me<strong>da</strong>llic*. do iodic' <strong>de</strong> refrado sdquirem caractsrAstiess aminotriples..<br />
Om holograms soot. registrado prods; difereoca ■ motev.ls mas dIrods<br />
<strong>de</strong> polarised. dos /sizes mmmmmm 'tido difratado <strong>de</strong>rmas... Wilms's. Ess I - -<br />
ma chsmsdo <strong>de</strong> difracso aolsotripics, permit. racoastrocee do holograms em tempo<br />
real <strong>de</strong> salis& muito simples, masse pare materiels cam baiztssimo lieliocia<br />
<strong>de</strong> difracio.<br />
Como example <strong>de</strong> splice° doses titmice, sp eeeeeeeeee ma<strong>de</strong> dos mo<strong>de</strong>s do mibrado<br />
<strong>de</strong> an alto I ■ leoto, st eee e <strong>de</strong> ticoics do bologralla imtrIeromitrica ■ utihi-<br />
sando coos material <strong>de</strong> resists° a ctistol
OT1/9:00/6A.f DETETOIES PlEMELETRICOS PARA RaillAce0 ELLTRONAGNefICA. Calve 'miler Cord/ -<br />
so o Michel Andre Aenerter. Institute <strong>de</strong> <strong>Fisica</strong> Quemice <strong>de</strong> Rio Carlos - Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Soo<br />
Paulo. Cm. Postal 369. 13560 Ilia Carlos, SF.<br />
Apresentaresos us escudo ■ istemitico <strong>da</strong> respost <strong>de</strong> dttores.<strong>de</strong> radisqio gig<br />
troosgnidca <strong>de</strong>seavolwidos prtir <strong>de</strong> car:micas PZT cadged' e estrngeirs. Isis coos innuendo<br />
<strong>da</strong> area dos elecrodos, emanmsers do dilator. resposta es snores. es Irelands, as pot/ends,<br />
e feitos goasetricos. etc. Dees <strong>de</strong>tetores ado missies. berates. risLivammuta sensivaim (ati 2T/11)<br />
e po<strong>de</strong>a ser usadom suss large faixs espectrl a cos wiring coofigursgeos geositrices (simple.<br />
quadrantes. etc). Fesquisa subiroodona<strong>de</strong> polo CliPq/PADCV.<br />
071/9:20/6A.F<br />
faANSMISSiO DO IMACZaS *TRAVER DE PUMAS. FOR NZIOS PURANERIZ<br />
OFTICOS. J. Cal 1- ilni.ersi<strong>da</strong>d "Risen Bolivar" Departasento <strong>de</strong> <strong>Fisica</strong>. Ca<br />
V -----nr71-71. Fs liaferri. J. Iand l a C.C. Lo es - Universi<strong>da</strong>d Fe<strong>de</strong>ral<br />
Flusi Domino dm <strong>Fisica</strong>. N terai. R.I. rasa . As fibres opticas<br />
{mo<strong>de</strong> ■ ser utilieedse couo canals per' t aaaaa itir ■ inais iptieos, ou mop.<br />
isgon'. Para sue utilizecio i necessirio proce<strong>de</strong>r a ems a<strong>da</strong>ptacio do mind cos<br />
a f 1 bra . tato pod ser feito por E<strong>da</strong>m puromeute opticos. sem "tapas el i -<br />
ces. utilimando em tecnics <strong>de</strong> codificaceo eremitic. Into i utilised* cos :xito<br />
as aaaaaa lase° <strong>de</strong> ismgens 3-0 ou 3-D <strong>de</strong> use Unica fibre ou <strong>de</strong> lisi -<br />
nas <strong>de</strong> fibres. No camp do iranssissio <strong>de</strong> ass losses 2-0 pot uos Unic ■ fibre, i<br />
necessiria owe asostrages <strong>de</strong> images exist. por aaaaa um. pord <strong>de</strong> inforsacio.<br />
Us to do namero <strong>de</strong> fibres permits use traipse:Id ■ <strong>de</strong> amostrage ■ odor e por<br />
taut* us aumento no miner° <strong>de</strong> ponies troussitidos. Ap aaaaa tomes ■ lgua ■ resultados<br />
obtidns.<br />
OTI/9:40/6A.F 'MEDIDAS DE ESPECTRO E CAMPO PROXIMO EN TEMPO REAL PARR LURES<br />
SEMICONDUTOREE'. - Rubens do Amaral Nato - CPqD-TELEBEAS. C.11 .1579. Campinas -SP<br />
CEP 13085.<br />
O .stalls do ccocorboannto do optics do mimeo pare lasers seadcandutores as fun-<br />
* <strong>da</strong> sun currents <strong>de</strong> polsrizapio 8 <strong>de</strong> Kuno intense, pare sisteees <strong>de</strong> omemicapies 8ptleas.<br />
COe(es montages' relativamenbe simples Wimps cbservar sisulbmumments o espeetroe o emqmo<br />
proximo dos lasers as um rcnitor <strong>de</strong> vi<strong>de</strong>o, oqme cods ser entio relaeionrcb a outran par/ metros<br />
<strong>da</strong>peniente" <strong>da</strong> corrente <strong>de</strong> polarisecio. Alcune dos principals ersatz dbeervados sips a) co<strong>da</strong><br />
Ca <strong>de</strong> .atlas do solo transversalyara lasers dm contact° largo (18ina per exemobo) e as suss son=<br />
esquinclas no eepecteo <strong>de</strong> eadsaso/ b) a gran<strong>de</strong>r" Alp/Alp (Ape comprimanto <strong>de</strong> cods do mambo dm<br />
.miss*: corrente <strong>de</strong> polarleacio) sting. valorem positives au negatives par lasers versotarcnts<br />
i<strong>de</strong>nticos o par cents Lasers so<strong>da</strong> gran<strong>de</strong>e& suds <strong>de</strong> sins! as urn particular aorrenttu<br />
el inetabili<strong>da</strong><strong>de</strong>s do tips ompetbiio <strong>de</strong> so<strong>da</strong>s longitudinal' qua forme aosocia<strong>da</strong>s a fortes lindtacaes<br />
na remposta cm frequinela nee respective' correntes <strong>de</strong> polarizareice dl almrgarenbo mibitos<br />
dos =dos longitudinsis a panto <strong>de</strong>mistura-kos, quo foresee:10CW= a instabili<strong>da</strong><strong>de</strong>s do mo<br />
do transversal <strong>de</strong>mentias geralmente <strong>de</strong> cow's& tenni, recanico na raga) atIve mix altos -<br />
gam normal.
'REALIMENTACAO OPTICA ENTRE LASER SENICONDUTDR E FIONA NONONOTIO -<br />
Il<strong>de</strong>fonso Felix <strong>de</strong> Feria Jr.. Felipe R. Barbosa - CPqD-TELEBRAS -<br />
Camprias.<br />
A quall<strong>da</strong><strong>de</strong> do acoplamento laser-fibra nio pods ear consi<strong>de</strong>ra<strong>da</strong> apenas em ter<br />
mos <strong>da</strong> sueeficiencia. Devemos tambem consi<strong>de</strong>rar is realimentagio optics <strong>de</strong>vi<strong>da</strong> 3<br />
011/10:15/6A.F<br />
reflexes§ nes extremi<strong>da</strong><strong>de</strong>s do fibre. Este efeito 6 responsivel taste pale module -<br />
cio na amplitu<strong>de</strong> <strong>de</strong> luz acople<strong>da</strong>. come per ruido espectral am enlaces <strong>de</strong> linha<br />
optica.<br />
Neste trsbalho anallsamos as flutuagOes <strong>de</strong> intensi<strong>da</strong><strong>de</strong> no fibre e alteracine<br />
no eapectro do laser. Este estudo a feito pare diferentes geometries <strong>de</strong> microlentee.<br />
Procuramos diminuir a roodimentagao rem comprometer a oficiencla <strong>de</strong> acopla -<br />
mental Fazemos um estudo <strong>da</strong> tolerincia aos <strong>de</strong>slocamentoe x.y.z.9 <strong>de</strong> fibre coal<br />
relagao ao eixo optic° do laser.<br />
O11/10:35/6A.F ESPECTROMETRO UPTICO PARR ESTUDO DE PERFIS OE MIMS ESPECTRAIS<br />
3ose Alberto C.L.Ribairo (Fundogio Oromiloirs pore o Dosonvolvimonto <strong>de</strong> Enoino do<br />
Ciancioo) a Roberto x.c.r . is (Institute <strong>de</strong> Fitlica-Un' '<strong>da</strong>ds <strong>de</strong> Sao Paulo).<br />
Um espectrametro opt ico dm ro<strong>de</strong> 112 difracio em manic Czerny-T , foi<br />
construido perm o amitotic <strong>de</strong> temperature lattice <strong>de</strong> pl ■ mirth* <strong>de</strong> medic's do<br />
alergemento Doppler <strong>de</strong> linhes eepectreis dm impurezes. 0 espectrometro tem<br />
distencia focal <strong>de</strong> 1500 me a utilize Ile redo hologrifice <strong>de</strong> 3600 1/ ■m. Foram<br />
celcuIedos os efeitoti <strong>de</strong>s ellerrecoes entices cobra o <strong>de</strong>sempenho do sperelhe.<br />
Utilizando u ■■ leaped. <strong>de</strong> mercuric a um laser <strong>de</strong> Ne-Ne, <strong>de</strong>terminou-se a forme.. do<br />
rungs° <strong>de</strong> aporelho, obtando-se use lemurs instrumental <strong>de</strong> or<strong>de</strong>al do 0.06 X em<br />
3.3100 R. Visendo ■phorer s resolugio do espectriretro @studs-se. no memento.<br />
efeito <strong>da</strong> introdugso <strong>de</strong> aesimetries no Diatoms optics,, es qualm doves permitir<br />
reduzir o eberregoo <strong>de</strong> coma. qua e s mais impoetante nest. tipo do espectrometro.<br />
Eetu<strong>de</strong>-1e (ands o efeito <strong>de</strong> diverges tines <strong>de</strong> Elmore' <strong>de</strong> epodiSegeo sabre a forma<br />
<strong>de</strong> Cunene <strong>de</strong> ■parelho.<br />
OTI/10:55/6A.0 MUMS DA RESOLD00 DO ESFECTIONETRO AORTIC° - dPTICO<br />
Jos; !diner Earbosa Oliveira<br />
Diviaio <strong>da</strong> Eageobaria Si - lea. TEEC-ITA-CTA<br />
Sie Jos: dos Campos - E.P.<br />
A apliessio do difragio acristice- optica pars ■ seliser a composigio *spectral <strong>de</strong> ra-<br />
diaciu tom se reveled° ext eeeeeee to atr eeeee dosed° eompredo cos as ticnices coo-<br />
veecionsie. Into se dove so fate quo a empectroscopia ecuseico-Optics permits roe-<br />
User sintonia com eleva<strong>da</strong>s veloci<strong>da</strong><strong>de</strong> <strong>de</strong> <strong>de</strong>re, larger@ angular s resologio.<br />
Neste trebelho op e tames um ■ aniline <strong>de</strong>telhe<strong>de</strong> <strong>de</strong> resolugio obti<strong>da</strong> corn sapec-<br />
trametros qua utilizam criatal <strong>de</strong> seams°. As ■ itusgOse Departmental...quo natio<br />
son<strong>de</strong> iuvestiga<strong>de</strong>s no ItA Lambe= sap relate<strong>da</strong>s. <strong>da</strong> aniline <strong>da</strong> rasalusao sip love-<br />
d.s em conei<strong>de</strong>ragio as anisotropies optica e sciatica. a disparsio optica do mein<br />
e a geometria <strong>da</strong> coluna acustiga. Mostra-me_que es massage <strong>de</strong> veloci<strong>da</strong><strong>de</strong> _<strong>de</strong> ver-<br />
redura empeetrm germ use reduce° se resolugeo do empeetroostro. Configuregoee <strong>de</strong><br />
espectrametro ■ qua germ.' resolugio do or<strong>de</strong>al <strong>de</strong> 10 4 ■ io sapecificadsa.
011/11:19/6A.F IACOPLAPIENTO DE HOBOS DR FORMA PASSIVA ER LASER DB COMMIE PARA osismao DE PUL-<br />
SOS ULTRACURTOS.Luss Felipe Lorensoni <strong>de</strong> Oliveira a Alvin Elliot Kial.Oepto.Eletranica Quiutles,In ■<br />
tituto <strong>de</strong> <strong>Fisica</strong> Clab listaghin. Universi<strong>da</strong><strong>de</strong> Estadusl <strong>de</strong> Campinss.<br />
Utilisamos um laser <strong>de</strong> co .cam cavi<strong>da</strong><strong>de</strong> linear, con ums solocio <strong>de</strong> 10 -4 M <strong>de</strong> Ro<strong>da</strong>mins 6C em sm.<br />
tarot. bombeado per limpadm flash. ands obtivemos miss.. na 'aim <strong>de</strong> 345 a 430 -no <strong>de</strong> ptilsos can di<br />
ragio <strong>de</strong> 1 micromeguodo a una largura <strong>de</strong> Hahn <strong>de</strong> 1,6 A.Introdusimos ums celm.contendo um* solugio7<br />
<strong>de</strong> DODC1 (3.3'dietilosadicarbocimoina iodi<strong>de</strong>)) am atanol, can um messiah° optic. <strong>de</strong> lam.Aa para<strong>de</strong>s /<br />
astern.. <strong>de</strong> muss janalms esti° revemti<strong>da</strong>s por films anti -vitiator. pars evitar per<strong>da</strong>s per reflesio,<br />
<strong>da</strong> or<strong>de</strong>m <strong>de</strong> 62. Has para<strong>de</strong>s i , ■ interface vidro-solvents provocari reflexio <strong>da</strong> spans 12,/<br />
i mm ndo <strong>de</strong> revencimento.E faits ■ recirculagio do DODCI - <strong>de</strong> use beam <strong>de</strong> ■uclie<br />
sisal's.<br />
O DODC1 pomsui caracteristices <strong>de</strong> trmm.mIsmio nio -IL 1 pare alt. i i<strong>da</strong><strong>de</strong> inci<strong>de</strong>nts ocorre<br />
■aeuragio do mein a consequentemenee alt. transmissio, a par. balsa ocorre 'mamma sssssssssss<br />
'slam sendo o chimes°. <strong>de</strong> abaorvedor saturivel.<br />
Situamos a cola a 4 cm do eapelho 1002 radiator a usentsmos pmulatinamente ■ clucentragio,e ohs<br />
o ■eguinee. Hi astreitamento dm lmrgur ■ temporal dos pulsom i em 6.6.10 M conseguimos use<br />
<strong>de</strong>utgio temporal <strong>de</strong> 80 ns. Hi <strong>de</strong>slocammeto <strong>de</strong> pica <strong>da</strong> bands <strong>de</strong> sadism pars o vermelho, pois tinhamom<br />
o pica em 595 nm a pelmets a WC an 610 am.<br />
Notmoos qua hi suits insubili<strong>da</strong><strong>de</strong> nm smimmio, Cato mdvindo dm 11 ' (energia do pulmo/mecgio<br />
rata irradie<strong>da</strong>l do pulso mar manor qua a fluincia <strong>de</strong> gio do abmorvador, nio send. sufi '<br />
pare ■aturi-lo. Portanto nece ss i ss focaliaar o false no calm do laser/odor pars po<strong>de</strong>r haver a plena<br />
modulacio <strong>de</strong>s per<strong>da</strong>s e amis. .bear o pulse ultracurto <strong>de</strong>sejado, gun i <strong>da</strong> or<strong>de</strong>m <strong>de</strong> 3 pa.<br />
Dave ain<strong>da</strong> s ssss a cola num. posigso e <strong>de</strong>ntro <strong>da</strong> cavi<strong>da</strong><strong>da</strong>, pare qua o pulse quando ogle /<br />
chases pals ■egun<strong>de</strong> ves, o ab dor jell estaja relasado a pronto pare us nova chaveamento.<br />
011/11:35/4A.F1PROCESSOS DE COMPIESSA0 INTRA-CAVIDADE DE PULSOS LASER ULTRA-CUR-<br />
TOS. Rubins S.Miran<strong>da</strong>. Carlos H. finite, Crus e Marco A.I. Scarper°. Depto. <strong>de</strong> Elea-<br />
crania. Quintica, ITCH-UNICAMP.<br />
Cote tratuallso tem coma objetivo a escudo, at - <strong>de</strong> uma slmulagio swamies. pro-<br />
d ■ comp - <strong>de</strong> pulses em 1 <strong>de</strong> cavi<strong>da</strong><strong>de</strong> em anal, operand° as regime<br />
<strong>de</strong> acoplameotos <strong>de</strong> mo<strong>de</strong>s cos pulses contrapropagantem. A combinagio dos efeitos <strong>de</strong><br />
auto-modulagio <strong>de</strong> Ease e dispersio qua acorns. em 1<br />
llamado a cootribulgio <strong>de</strong>ste ■ so perfil do pulse d<br />
(trabelho em an<strong>da</strong>mento).<br />
<strong>da</strong>me. tipo i estu<strong>da</strong><strong>da</strong> ens<br />
prommilo ma cavi<strong>da</strong><strong>de</strong>.
WI/PAINEL 1"PROJETO DE DI000 ISLETROLUMINESCENTS EM LIGA clumsokitilA InGaRai, SOUS<br />
- Pollee R. Barbosa - Clotai-MLBONAS, 13.085-Campinas - SP.<br />
A chama<strong>da</strong> pare diapositives eletrolominescentes <strong>de</strong> emissio em 1,3pm<br />
<strong>de</strong>vi<strong>da</strong> i excelente tranamissaolile sisal am fibris aticas monomodo nesse comprimonto<br />
<strong>de</strong> on<strong>da</strong>. Apresentamos o projeto <strong>de</strong> um diodo eletroluminescente end-<br />
tindo nessa faixa <strong>de</strong> 1,2111-1,32um. Para o pro2eto sao consi<strong>de</strong>ra<strong>da</strong>s a dopagem <strong>da</strong><br />
reglio ativa a cama<strong>da</strong>s confinantea, comprsivaolnI4Wkl, a espeseuras <strong>da</strong>m<br />
virias came<strong>da</strong>s.<br />
Sio discuti<strong>da</strong>s tambem a geometria do dispositivo, a Influincia <strong>de</strong> macro'smom<br />
<strong>de</strong> recomblnacio interfacial, a a otiminacio <strong>da</strong> eficiincia a do ban<strong>da</strong> passimte<br />
<strong>de</strong>mise LSD.<br />
OH/PAINE!. 1 LASER DR Corm DR CON SINTONIXAVEL NO INFRaMemzum PROXIMO. Ricardo Aaa. <strong>da</strong><br />
?AM S Maximo Sin Li (iantituto <strong>de</strong> ' quimica <strong>de</strong> Sio Carlos. USP)<br />
rei conatruido on laser ds centre <strong>de</strong> cor (LCC) qua utilize come silo ativo um ' 1 <strong>de</strong><br />
KC1 12 Licl cos reatroa two. 0 precise', <strong>de</strong> criacio <strong>de</strong> (II) i foie° atrav6a <strong>da</strong> fotoranxersio<br />
<strong>de</strong> central P em F A(ll). A cavi<strong>de</strong><strong>de</strong> Otica do LCC i rereads' per 3 espelbos, qua junto cum o<br />
main stile; forum mma cavi<strong>da</strong><strong>de</strong> astigmaticamente compenaads. 0 aspen* <strong>de</strong> 'itri<strong>de</strong> i um =mimeo undo<br />
a emperfici ■ cancava i 'Masonic refletivs pars 2.7 um a altamente Imago. perm 314 me. a mapelts°<br />
crntral i um espelho di prat ■ altamente rafietive e empathy <strong>de</strong> sai<strong>da</strong> i parcialmente transmissive,<br />
52. pare 2,7 um. 0 LCC i Domboodo per um lamer <strong>de</strong> Ar' on S14 an, obtoodo-ma. at 000 o <strong>de</strong> um<br />
prisms <strong>de</strong> safira come meio dispersive. um in rrrrr lo <strong>de</strong> ■ ineenia <strong>de</strong> LSO a 2,03 um. Aombeando o LCC<br />
cam but dm Ar' em regime dm moltilinbas, obtevm-se 'Kier ' <strong>de</strong> 0.142 Co. um limiar <strong>de</strong> excitagio<br />
<strong>de</strong> 272 mu. 0 (slim do LCC tee ' ' do mo<strong>de</strong> Moo a sus divergincia esti em tome <strong>de</strong><br />
3,3 ■ rsd.<br />
011/PAINEL ESPALHARENTO OE HIE POR ESFERAS RUGOSAS. S.L.Cosar.E.F.Vasconce -<br />
los a G.A.Farlas. Departamento <strong>de</strong> Ftsicm.UFC - FOrtalera,Ceari-60.000.<br />
Estu<strong>da</strong>mos o espalhamento <strong>de</strong> )110 por uma esfera qua apresenta uma rugosi<br />
<strong>da</strong><strong>da</strong> aleataria. Consi<strong>de</strong>ramos a rugoSi<strong>da</strong><strong>de</strong> pequena, <strong>de</strong> Bodo qua os campus elitri -<br />
co e mignitico seja ■ colculados por teoria <strong>de</strong> perturbacio.<br />
Calculamos a Deere's total espalha<strong>da</strong>. a segio <strong>de</strong> cheque <strong>de</strong> espalhamento<br />
e mnallsamos a aistura <strong>de</strong>s pari<strong>da</strong><strong>de</strong>s nas fancies esfiricas (Swift a rugosi<strong>da</strong><strong>de</strong>.
OTI/PAINEL ALARCAMENTO ESPECTRAL OR PULSOS LASER INTERNS EM FIRMS °PUGS<br />
Telma V. Cardoso. Hugo L. Previte. Alvin Kiel e C. H. Into Cruz<br />
UNICAMP - INSTITUT° 08 FISICA/DM<br />
Ovando ue pulse <strong>de</strong> lus loteoso se propaga to um fibre Optics. sua frequncla instant:nes<br />
<strong>de</strong>sloca<strong>da</strong> pars o versatile e o emit. ea fronts e nu muds do pulse. respectivemente. Bete fe<br />
ammo. chimed° cute-mo<strong>de</strong>lagio <strong>de</strong> Isms (AMP), i <strong>de</strong>ci<strong>de</strong> i <strong>de</strong>pen<strong>de</strong>ncie do indite <strong>de</strong> refracio come<br />
■ intemi<strong>da</strong><strong>de</strong>. A acio combina<strong>da</strong> <strong>da</strong> AN? cm a disponi° <strong>de</strong> mloci<strong>da</strong><strong>de</strong> <strong>de</strong> grope positive do mein<br />
las com qua n frequincia. no melor p do pulse. neje uma fungi° linear do tempo; naniresta-<br />
se come to pulso alarm& temporal e 2spectrstmente que pods ser comprimido no tempo pet ■ pas-<br />
■aim am Wilms <strong>de</strong> 'tram com disperse° °posts. De eeeee ems o inclement° <strong>de</strong> nooses pemquima ■ so<br />
bra este efeito am fibres Ziptica ■ menemodo, uman<strong>da</strong> um loser <strong>de</strong> Nelaag cm no<strong>de</strong>-locking continuo<br />
(A - 1.06nn. lergurn spectral -0.3 I. pulses cam durosio 100 pa, potineiss <strong>de</strong> Pico 100 -<br />
200 11) e me limbs <strong>de</strong> atraso formsdo per um par <strong>de</strong> gra<strong>de</strong>s <strong>de</strong> difraqio. No memento, estu<strong>da</strong>mes o<br />
alarganento espectral Al em fibres memo& <strong>de</strong> T2lebris cam <strong>da</strong> poancia do laser. Em<br />
ma fibre <strong>de</strong> 1600 m. ohmervemos 611-171 (em mince° a largura spectrel do laser). pare uma potincia<br />
media &copie<strong>da</strong> i fibre <strong>de</strong> 600 MM. Nota-se que AA i uma funiio critics tante <strong>de</strong> potencia<br />
implo<strong>de</strong> 1 fibre moo do alinhamento. Traballie ■ publicados na area report= resulted°s smoothen<br />
tes nos mums com fibres curtas (i300e) a lasers <strong>de</strong> potencies maim alum.<br />
Aira<strong>de</strong>cemos a FARM e a Tlebris polo ■uparte finasceiro.<br />
OTI/PAINEL TEMPO DE CRESCIMENTO DO PULSO ER LASERS DE CORANTE SIHTOHIZAVEIS<br />
3.H.Hartin Rios, A.E.Klel, 61.L.FratinIto. (Institute <strong>de</strong> <strong>Fisica</strong>, UNICAMP)<br />
Estu<strong>da</strong>mos experlmentalmentm a <strong>de</strong>pendincla do tempo <strong>de</strong> crescimento <strong>de</strong> um pul<br />
so. T ,com o comulmento <strong>de</strong> on<strong>da</strong> A num laser <strong>de</strong> corante sIntonlzavel (com gra<strong>de</strong> 2m<br />
Ligulo <strong>de</strong> Inei<strong>de</strong>ncla rasante), bombeado transversalmente per um laser <strong>de</strong> nitroge-<br />
n lo (pulsos <strong>de</strong> 8 ns <strong>de</strong> folio, 400 kW <strong>de</strong> potencla <strong>de</strong> plea, SHi <strong>de</strong> repetiao). As me<br />
di<strong>da</strong>s foram reallza<strong>da</strong>s Co. um oscilosceplo r4pIdo a fotodlodo <strong>de</strong> avalanche (tempo<br />
<strong>de</strong> subl<strong>da</strong> do conjunto
INTERPENOUTRIA EN FIBRILS MICAS ONINODAIB<br />
Jean Pierre von <strong>de</strong>r Plaid<br />
Depto. <strong>de</strong> 'Isles - PUC/RJ<br />
Os retardos <strong>de</strong> grupo in fibres 'pities@ unimodmi ■ po<strong>de</strong>m sec madidos Interferometri<br />
camera, coo ems precisio do - 2 fe entre 1000 um s 1700 um.<br />
1sta medi<strong>da</strong> permits <strong>da</strong>terminar a disparsie cccc :tics <strong>de</strong> Morse unimedmis. e em<br />
particular a disparsio <strong>de</strong> polarisegio em fibres birefringentas. ■irefringincias<br />
dm or<strong>de</strong>m <strong>de</strong> 1 es/ ■ po<strong>de</strong>m ser dire 00000 to madi<strong>da</strong>s sem o emprego <strong>de</strong> alementos pole<br />
rismdorem. A tecnica pods ter esteodi<strong>de</strong> a fibra do rafting:1m ate 0.02 gp ■ /■ a-<br />
t " <strong>da</strong> million dos Wrap!. <strong>de</strong> interfarincie em fungi° do comprimenta <strong>de</strong> ands.<br />
Bats ticnica permits tambile d m hear retard° <strong>de</strong> fame entre .os dram modus' <strong>de</strong><br />
polerisegao, coo aplicagias a seosore ■ e stemma <strong>de</strong> trenemisame c 00000 te.<br />
07I/PAINEL<br />
ALTElagEo LOCALIZADA DO INDIC!! DI IBTRACIO BR NATBRIAIII UMLAUT'S":<br />
APLICACAO NA moDucIo DB MPH I CUIAB OTICO!<br />
Raul Almei<strong>da</strong> Nuns., Urinal Paciornik, Luis Carlos Sue<strong>de</strong>s Valente.<br />
Ripolito Jose :Latium/mkt. Luis Carlos E dm do Carnes<br />
PUC/RJ. UFF<br />
Os cristai ■ ou filmes <strong>de</strong> materials ianicom s iinicee-molecularee ■ lo muito Genoa<br />
—<br />
✓eis ao impacto <strong>de</strong> [einem <strong>de</strong> alatrons nu fairs <strong>de</strong> 20 k V a 30 k a 9, f do.<br />
<strong>de</strong> forma locelismds. grand <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> <strong>de</strong>faitos superficial. do tips centres<br />
<strong>da</strong> tor. Beta proprie<strong>da</strong><strong>de</strong>. associsd ■ a focalisacio do fairs eletanico <strong>de</strong> UM& microsson<strong>de</strong><br />
el 000 o ica (fain* <strong>de</strong> 1 a 100 ■icra) e d laid° ■ dm<br />
controls <strong>de</strong> ports amostre permitirmm <strong>de</strong>srinvolver on isses& <strong>de</strong> geragio <strong>de</strong> perfis<br />
por litografia el Lea.<br />
A alto <strong>de</strong>usi<strong>da</strong><strong>de</strong> <strong>de</strong> absorgio &tics produsid ■ am aubmtratos <strong>de</strong> LIP (Pico <strong>de</strong> 'boor<br />
glo do P sits em 250 nm) produs veritigio do Indica du reEragao se regiin<br />
do inf 00000 melba suficiantes pars condusio otica (An : 10 -3 a asp <strong>da</strong> fairs<br />
<strong>de</strong> 5 a 10 sacra).<br />
Bo laboratOrio. amiss iticon coo 20 v <strong>de</strong> largura foram produsidos e mita-<br />
dos <strong>de</strong> langameato <strong>de</strong> lot natio send., analisadoe. Do estudo do distribuigio mo<strong>da</strong>l<br />
pretends-se analimar perfil <strong>de</strong> Indies <strong>de</strong> refragio <strong>de</strong>s linbas produsi<strong>da</strong>s ao len<br />
go do profundi<strong>da</strong><strong>de</strong> <strong>da</strong> fairs.<br />
O PANEL IINISENVOLVINENTO DE gOTENCIONBTROS OPTICOS PARA OPBRACIO EN IMES<br />
06 TIBIAS MORONODO. Seralo Calasebi Jose Ta<strong>de</strong>u <strong>de</strong> Jamul'. CIID/Telebria, C.P.<br />
1579. Campine - 13015 - SP.<br />
O rapids d Ivimento <strong>de</strong> aplicagio <strong>de</strong> fibra monomodo em 00000 icagi<strong>de</strong> tem produ<br />
sido gran<strong>de</strong> <strong>da</strong>mand ■ <strong>de</strong> ecopladore ■ a diepositivos correlatos tails como chew.' optica<br />
■ seletiva ■ multiplena<strong>de</strong>res. Apra 0000000 s nestle trabalha on neconismo ■ impiai<br />
■ partir do coal foi <strong>de</strong>seuvelvi<strong>da</strong> Pupa charm ;optics seletiv ■ ou potonciimetre Optico<br />
passivel <strong>de</strong> °partici° a ravels sub-dB <strong>de</strong> per<strong>da</strong>. Este dispositivo ale poseue compensates<br />
Sprig!' di 000000 s mends ituido - apeees palms fibrin sum estrutura<br />
0<br />
<strong>de</strong><br />
suport ice. 0 ch dm p o is luminous e iudusido placard<br />
at <strong>de</strong> <strong>de</strong>formagle ■ 'listless asimim <strong>da</strong> <strong>de</strong> scoplamento fabrica<strong>da</strong>, na<br />
opal ocorre o f ens <strong>de</strong> batimento optics. Ob nos goo 7 gf <strong>de</strong> carga mplica<strong>da</strong><br />
■ximlmente i a 00000000 <strong>de</strong> acoplamento 1ptico produs 551 <strong>de</strong> variagin nas potincims<br />
&prices <strong>de</strong> saI<strong>da</strong>. Bates a Dutra@ resultsdom ego iuterpretados assumiudo-se <strong>de</strong>for-<br />
■agpies elisticaa no es 0000000 <strong>de</strong> bum o "ptico produsi<strong>da</strong> palm fusio dos fibres<br />
em um perfil bianico. A per<strong>da</strong> total <strong>de</strong> p - la Optica medi<strong>da</strong> no dispositivo i <strong>de</strong><br />
aprozima<strong>da</strong>mente 0.1 dl a goal alio l senslvel 1 cargo - ins neceseiris 1 armrest°.<br />
Da<strong>da</strong> e ■ implici<strong>da</strong><strong>de</strong> cooceltual dusts dispositivo. sues 0000000 rlaticas <strong>de</strong> bmi<br />
is per<strong>da</strong> a alto estabilid ■<strong>de</strong> mecinica, o memo -se atrativo pars oparagle ■ em<br />
red=s do fibres monomodo ou em sistemas Opticos di instrumeatmgio.<br />
Iambi.. no Dept° <strong>de</strong> 111 "<strong>da</strong>ds <strong>da</strong> Essc-usr, 13560 - B.Carlo ■ - SP.
OTI/PAINEL<br />
1141CROLENTE ELIPT1CA PARA ACOPLANENTO OPTICO BE FIBRA 141 1N014000 COM<br />
LASER SEMICONDUTOR DE GUIAMENTO POR GAN1IO. Jose Ta<strong>de</strong>u <strong>de</strong> Jesus e Il<strong>de</strong>fonso F.Faria<br />
Jr. CPyll/Telebria, C.P. 1579. Campines, 13085, S.P.<br />
X—Wartsao <strong>de</strong> per<strong>da</strong> no acoplamento latter semicondotor e fibre iptica i <strong>de</strong> gran<strong>de</strong> in<br />
teresse pare comunicesEes Sptices. A dificul<strong>da</strong><strong>de</strong> <strong>de</strong> se obter ban acoplamento resi:<br />
<strong>de</strong> na diferenca entre os modos <strong>de</strong> emissio do laser (eliptico) e <strong>de</strong> guiamento do fi<br />
bra (circular). Estudos sabre a eficiencia do acoplamento laser semlcondutor-fibri<br />
mostram que fibres com face plans resultem em baize acoplamento ('MS). align <strong>de</strong> is<br />
troduzir ruidos no sinal emitido polo laser <strong>de</strong>corrcntes <strong>da</strong> reflcxio <strong>de</strong> luz nests<br />
face. Para nelborar esta eficlincia e minimizer problems <strong>de</strong> realimentncito Optical.<br />
utiliza-se microlente na extremi<strong>da</strong><strong>de</strong> <strong>da</strong> fibre a ser acopla<strong>da</strong> so laser. Eats ticnico<br />
permite obter-se eficlincia <strong>de</strong> ate 301 pars laser com guiamento per ganho. Neste<br />
trabaiho procurnmos melhorar o acoplamento loser-fibre utilizando uma estrutura<br />
com geometria elIptica e microlente. Esta geometria a obti<strong>da</strong> a partir <strong>de</strong> seccio <strong>de</strong><br />
acopladores bidireclonsis <strong>de</strong> fibre optic. monomodo produzidos por fusio. Com este<br />
configuracio esperamos obter acoplamentos superiores a 401. Resultados experimentais<br />
preliminares serao ■presentados e discutidos.<br />
OTJ/PAINEL IONA NOVA CONCEPOO DE MODULADORES ELETRO-OPTICOS. Sergio Celaschi<br />
a Cesar A.Evora. CAO/Telebres ■ C.F. 1579 - Campine@ - 1308S - SP.<br />
@scenes d ■ comuoicacio optic ■ <strong>de</strong> sits largura <strong>de</strong> bends ■ longs ■ dlotincias opers ■<br />
com 1 <strong>de</strong> pequens 'argues ■ spectral ("Distributed reed-Back L "), send* a<br />
inforoacio tranninitI<strong>da</strong> via fibras monomodo. Estes lasers quando modulados a mites<br />
fregoincies (GAB) p m a ter Ialguro ■ asp . . i . comprometendo<br />
amain todo o ' as <strong>de</strong> comuniessoes. Noduladores eletro-iptieo ■ e PPPPP OM so laser<br />
tem lido utilinadoe pare ■olucionar sate problems. pori ■ o estado-<strong>da</strong>-arts <strong>de</strong>nte ■<br />
diapositives pa<strong>da</strong>ce <strong>de</strong> sites pan<strong>da</strong>s <strong>de</strong> p P ' is Optics (:7 dB por dimpositivo)s1im<br />
<strong>de</strong> baixa estabili<strong>da</strong><strong>de</strong> mecinica. Apresentamos eeeee trsbalho time nova eeeee pcio <strong>de</strong><br />
■oduladores aletro-Spticom, es goals sirs li <strong>de</strong>s limitacee ■ @pentad's ■cimaale!<br />
to eeeee toga°, o modulmfor a tornado por um scoplador 2.2 m do, no goal ■ Ira..<br />
cio <strong>da</strong> potincia Optics eeeee ferids <strong>de</strong> uma fibre i outra i fort <strong>de</strong>pen<strong>de</strong>nt. do<br />
comprimengo <strong>de</strong> on<strong>da</strong> mitido a do Indica <strong>de</strong> retracio do meio externs is fibres<br />
u a regiio <strong>de</strong> acoplamento Estudom iniciai ■ <strong>da</strong>m m que este element° ap<br />
boa estabili<strong>da</strong><strong>de</strong> secinica a opens a nfireis <strong>de</strong> per<strong>da</strong> <strong>de</strong> potincia eletrommg a ' in<br />
.<br />
t I dB. Suss proprie<strong>de</strong><strong>de</strong>s Optical' nip regi<strong>da</strong> ■ polo fenameno <strong>de</strong> interfere:<br />
m eee i e optics. reaio <strong>de</strong> estrous 'bilids<strong>de</strong> do dimpositivo <strong>de</strong> acoplamento ■ peg<br />
eeeee missiles nas eeeeeeee se <strong>de</strong> propagscio do .eio. Sendo eats acoplador cony.nientemente<br />
mooted° em um sub ttttt o eletro-Optico. ou pejo, cujo Indite <strong>de</strong> reinstics<br />
seja p 1 <strong>de</strong> modulasio, es p - ins Optical. scree complementarmonts sodulads@<br />
nom dues fibres d ■ salads do diapositive. Seri° spresentsdos dodos preliminare'<br />
ben come d' 'do o impost° priactpio <strong>de</strong> operas:a <strong>de</strong> tall element(' <strong>de</strong> module-<br />
SAO.<br />
Taulbee': no Depto <strong>de</strong> Eletricl<strong>da</strong>dn - EESCIUSP - 13560 - S.cartn ■ - SP<br />
OTI/PAINEL<br />
I TRACADO DE SACOS ER SISTERAS drItcos. levee Aline' (institute <strong>de</strong> Filmic. Quimica<br />
<strong>de</strong> Sin Carlos. uSP).<br />
Oa eitodos ususi ■ pare ■ otimisagio <strong>de</strong> nistemes Ignites canning en cretuar cilculo atra-<br />
via du um sap <strong>da</strong> Lei <strong>de</strong> Snell, in que pm eoelieiente ■ <strong>de</strong>s aberrsgies ipticas relacionam-se<br />
com o grau <strong>de</strong> asp . No entente a Lei <strong>de</strong> Seen admit, dual rep eeeeeee caps vetorinis. con um. di<br />
1as envoivendo es co- diretores, can a base eonsi<strong>de</strong>rm<strong>da</strong> no pool* <strong>de</strong> interceptacio do raio no<br />
interlace. 0 conjunto <strong>de</strong> equacoen qua <strong>de</strong>termine. ■ ecologic do raio i Distant, simples no traced°<br />
<strong>de</strong> taios meridienuis,. on<strong>da</strong> as pods eitbelecer tin conjunto commm <strong>de</strong> equegies par. CUIWATUra,<br />
silica ■ a negatives <strong>de</strong> interfaces estericas, e on ■ interface, plans@ o resultado a 'mediate. posse<br />
mod° obtimme dodos sobre as aberraces ■ creatitieas„ loco paraxial. loco do circulo <strong>de</strong> coufuslo<br />
▪ estabelecendo amain Os parimetro ■ do e i ttt na optico em consi<strong>de</strong>racio.
011/PAINEL CASAMENTO DE PAM UNA NOVA TIME* PARA FADRICAO0 DI COMPONENT'S<br />
BOLOGRIFICOS<br />
Lucile B. C<br />
Universi<strong>da</strong><strong>de</strong> Istadual <strong>de</strong> Campine.<br />
▪<br />
Gereldo F. Hen<strong>de</strong>e, Jaime ■ ralli'cli<br />
11 pees/v.1 g imminence dole bolas aaaaa Insetted, entre else use relasie<br />
<strong>de</strong> fess pr6-<strong>de</strong>termina<strong>de</strong> (re lass, castr ■-fase, ±900 ). Tape po<strong>de</strong>ri nos permitir<br />
graver uma reds <strong>de</strong> difrasea pass-a-passe pale superposisao spacial ds reds ■ no-<br />
sorea.<br />
O le <strong>de</strong> fase pods vlsbiliser uma titmice suite discuti<strong>da</strong>, mem peace execute<strong>de</strong><br />
comp s Slates' <strong>de</strong> Fourier, pars pr.:Ansi: um ■ weds assimitriea (blamed) por superposigae<br />
<strong>de</strong> harmaaicem especial..<br />
Apresant aaaaa a resulte<strong>de</strong> ■ experimental@ prelimluares. '<br />
Oil/PAINE!. I APL/CACAO DE DISPOSITIVOS DENICONDUTORES PARA EXCITACAO N DETECAO<br />
BM ESPECTROSCOPIA RANAN A Rubens B <strong>de</strong> Castro e Paulo N B Pedreira IFGW UNICAPIP<br />
Construimos um espectrometro Raman sem partas movais, on<strong>de</strong> a fonte<br />
<strong>de</strong> excitacio 6 um laser semicondutor <strong>de</strong> Gaalas tipo monomodo longitudinal emitindo<br />
em 8600 X e o <strong>de</strong>tetor i um mosaics monolltico <strong>de</strong> foto-sensores <strong>de</strong> Si, refrigeredo<br />
termoeletricsmente a -40"C, e controlado por um microcomputador. Para mini<br />
mixer reflexos Ique indusem funcionamento multimodo do laser), a radiacAo 6 Collma<strong>de</strong><br />
a dirigi<strong>da</strong> sabre a amostra usando um refletor esferico. Com uma potAncia in<br />
ci<strong>da</strong>nte <strong>de</strong> 8mW, calculamos qua a expomicio efotiva por sensor 6 1650 eletrons/seg<br />
P/ piece Raman -1000 cm-1 do tolueno. 0 <strong>de</strong>sempenho Redid fa! 3 vexes pier do<br />
qua o calculado, sendo isso atribuivel a insficiiacias no sistema <strong>de</strong> coleta <strong>da</strong><br />
lux espalha<strong>da</strong> e iluminacio nio uniforms <strong>da</strong> regi6o ativa. 0 <strong>de</strong>aempenho calculado<br />
pole ser melhorado por 3 or<strong>de</strong>ns <strong>de</strong> greeds= cell aperfeicoseentos tocnicos e<br />
fonts& mail potenten.<br />
nTI/PA/NEI FLEITURA CM AMPLITUDE OS ON REOIST20 &TIDO RN VASE<br />
?mule A,N. dos Suttee, Luella 11.Capeato, Gerald. F. Nestles, Jaime lirellieh,<br />
Universi<strong>da</strong><strong>de</strong> Moral Fluminesses Universi<strong>da</strong><strong>de</strong> Istadual <strong>de</strong> Cempinas<br />
Ums Lessem grave<strong>da</strong> num film fatearifice pods ser observed, porgies sla module a<br />
amplitu<strong>de</strong> <strong>de</strong> lux qua a a aaaaaa se: shame-se <strong>de</strong> resists° em amplitu<strong>de</strong>. A_mesma ime-<br />
sem 'steeds sum films trump <strong>de</strong> fo r Los results sums modulasaa <strong>de</strong> roleva<br />
no fllme o sue nip pods sir observadojoie ela mio sista s ■mplituds ■em a lese<br />
<strong>da</strong> les us leitur ■ (resistro nu fess) a goal o cabs no i senelvel.<br />
passive) Ter em emplitu<strong>de</strong> us resists <strong>de</strong> fame se ■ ste (informagio) module a amplitu<strong>de</strong><br />
<strong>de</strong> time red* <strong>de</strong> lase do mita irequanais (portadore) staved' ne fotorresins.<br />
eats mitedo tem elsumss aaaaaa @ai<strong>de</strong>s. lute aaaaa utast !Aril repredusia, alt ■ sea-<br />
■ibili<strong>de</strong>ds, alts fi<strong>de</strong>li<strong>de</strong><strong>de</strong> e dIfiell <strong>de</strong> <strong>de</strong>terierar. Serie apremsete<strong>de</strong>s resulte<strong>de</strong>a<br />
experiments's.
UTI/PAINEL 1 LASER DE ARDONIO IaNICO DR 111.11A POTENCIA. Artemio Scslabrin(lee-<br />
'<br />
tituto <strong>de</strong> F' ' . Depto. Elatrinica Quistina. UNICAMP ).<br />
O laser <strong>de</strong> Ar e tem gran<strong>de</strong> importincia ea pesquis ■ ciencifica e nas dplicacie ■<br />
tecnoligicas per emitir linha ■ into gm regime 00 espectro visivel<br />
(4118om 5L4 nm). Lamar. <strong>de</strong> Ar s <strong>de</strong> potinci ■ <strong>da</strong> or<strong>de</strong>m <strong>de</strong> IV au maim esigem -<br />
ma <strong>de</strong> refrigersq;o <strong>de</strong> igua gelid& pare sue operacia. Nos Ultimo@ anon foi Maven-<br />
volvido nos EUA. Europa a !Bpi* um laser <strong>de</strong> arginlo pequeno ■ refrigsrado a ar,<br />
que apssar <strong>de</strong> sue balsa potincla ( 1-20mW ) gran<strong>de</strong> niimero <strong>de</strong> apli<br />
tacos'. Nesse comunicacio ap mos as principsi ■ i <strong>de</strong>m tipo<strong>de</strong><br />
laser, ben come relatamo ■ sabre o prolate <strong>de</strong> d 1%qm...et° <strong>de</strong> um lamer <strong>de</strong> Are<br />
ds balsa p is qua esti geo<strong>de</strong> @labored.) ma UNICAMP.<br />
OTI/PAINEL J ROTACIO DR FARADAY EN CRTSTAIS ELETRO-OPTICOS: Egberto Munin.<br />
Antonio 'attain Villaver<strong>de</strong> (Inst. <strong>de</strong> <strong>Fisica</strong> - UNICAMP).<br />
A fonts <strong>de</strong> voltage. geradora dos pulses in <strong>de</strong> tempo magnitico foi totalmente<br />
i aa <strong>de</strong>, consegnindo-se uma precisin malbor qua LX na selesio <strong>de</strong> voltagem <strong>de</strong>-<br />
■aja<strong>da</strong> ( equivalentemenre do tempo ■agnitico ). Foram feitos testes <strong>de</strong> Conte tom<br />
<strong>de</strong>sempenbo satisistirio. A calibracio do sistems foi realised& at aaa a do umo <strong>de</strong><br />
uma ■momtra <strong>de</strong> vi<strong>de</strong>o F1-5, cuj ■ rotacio <strong>de</strong> Fara<strong>da</strong>y i conheci<strong>da</strong>. 0 listens, ji cars<br />
teased° a calibrado, foi usado pars Emile a Rotagio <strong>de</strong> Fara<strong>da</strong>y <strong>de</strong> uma familia <strong>de</strong><br />
aa i aa sis eletro-Optico ■ dieter:Woe a nio d dos: ADP, RDP. ED*11 . CDA<br />
correspon<strong>de</strong>nces a dile aaaaa s cations e anions. A medisio foi realisa<strong>da</strong> cobrindo-se<br />
espectro visivel <strong>de</strong> 347 etc 694,3 nm ■ mediants o uso <strong>de</strong> uma ■ irie <strong>de</strong> 1 . In<br />
emtedo fel (alto aaaaa ado relscLonar o valor ds constants <strong>de</strong> Verdt dos diferantes<br />
cristals tom as proprie<strong>da</strong><strong>de</strong>s dos cations a anions qua formen esses cristais.<br />
OTI/PAINEL<br />
LASER DE Nd:YLF CW COM 1 WAIT * . Wagner <strong>de</strong> Rossi, Gessi Eduardo Calve Nogusira,<br />
NiLson Dias V' ' Junior Spero Penha Novato. (institute <strong>de</strong> Pesquisae<br />
Energetics' a Nucleates IFEN/CKEN/S1).<br />
Foi con do e tested* oafs um laser <strong>de</strong> Ad:IPLF, o quinto <strong>de</strong> use familia<br />
<strong>de</strong> lasers do Nd:YLF qua rims <strong>de</strong>senvolvendo no 1PEN. A cavi<strong>da</strong><strong>de</strong> bombeadora i do tipo slips. duple<br />
tom refletores <strong>de</strong> ouro a con dual limpadsm <strong>de</strong> tuns -holosinio perfasendo 2000 watts <strong>de</strong><br />
potincia <strong>de</strong> mitred... Foram utilisado ■ bastOss <strong>de</strong> Nd:YLV usinados a polidos um nossos taboret - '<br />
▪ msdi<strong>da</strong>s comp ' tom bests:w ■ ds Nd:VAC foram realisado ■ a serio ap o<strong>de</strong>s. PIKE?.<br />
Prolate PINE?
01I/PAINEL IRELACOES FJITSE POT2IICIA DE EXCITACAO I COMPOSICi0 DA M1STURA GASOSA EM LASERS<br />
DE CO, DC. J. A. Martins <strong>de</strong> Mello, R. N. do Braganca a C. A. Massone. LaboratOrio <strong>de</strong> Espec aaaaa °-<br />
pia elem.-, institute <strong>de</strong> !<strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong><br />
296, literal, 24210 RJ.<br />
0 eetudo dos release entre components. <strong>de</strong> vi g (002412-11e) parr lasers <strong>de</strong> CO: a-<br />
present ■ pa inters's. critic° per sus relacio cos ■ eficiincis do funcionamento a potincia maxima<br />
<strong>de</strong> emissio do laser. For anslisa<strong>da</strong>s as misters. (CO2-112 -He) 1-1,-T cam 2.0. 1, 2, 3 a 4 a T 6, 8,<br />
10 a 12; pare tubas <strong>de</strong> <strong>de</strong>icers' <strong>de</strong> 1 metro <strong>de</strong> comprimento a diametral! <strong>de</strong> 8 e 10 mm. Se acbou on<br />
comportamento geomatrico norm no piano "pot -antis <strong>de</strong> excitacio vs. preemie ;me<strong>da</strong>l <strong>de</strong> 002 as ■istara<br />
gamma". Este comports:mote p1 ' one eerie <strong>de</strong> divi<strong>de</strong>s em relacio oo significsdo ass slips..<br />
obti<strong>da</strong>s, ova dispeaLcio ice. significado doe Foca.. etc. Da analise <strong>de</strong>s ml 1-0-T<br />
fel possivel inferir a taxi <strong>de</strong> dissociacio do CO2, <strong>da</strong>ndo no indicative do p <strong>de</strong> trsneferinci<br />
■ 000000 ante <strong>de</strong> allergia<br />
e-(rapIdo) CO2 00' 0<br />
CO' CO2 (X. moo) 4. 00 00 2 (1. 00°1)<br />
Prabelho parcialmente financiado par VIM CIIPq<br />
RELTaird4olOVOS RESULTADOS EIPERIKENTAIS NA GERA00 DE PULSOS LASER KULTIFLOS NO CO EXC1fiswi<br />
ONF DE CATODO OCO. N. Brim Fernan<strong>de</strong>s Falb.. R. <strong>de</strong> Macedo Men<strong>de</strong>s. C. B. Pdpaleo<br />
e C. A. Maisons, Laboreario <strong>de</strong> Espectroscopia a Laser, Institute <strong>de</strong> <strong>Fisica</strong> ■ Universi<strong>da</strong><strong>de</strong> F era<br />
Flrsiiiail77CF296, literal, 24210 2J.<br />
Foi ap do emote (1-2) um loser <strong>de</strong> CO 2 excited° por configuragio <strong>de</strong> cited° oco quo<br />
germ's um conjunto <strong>de</strong> pulses laser multiples, pare um inic o pulse <strong>de</strong> excitagae. Este "Lame se<br />
Daisies no mo<strong>de</strong>lo <strong>de</strong> C. S. Willett (3) con 5 ano<strong>de</strong>.. Deets mo<strong>de</strong>lo se obteve no comportment° qua<br />
pereitiu <strong>de</strong>terminer a proporgio CO 2-1112 quo optimism,. o process° <strong>de</strong> transfarincis ressonante <strong>de</strong><br />
margin-<br />
0 trabolho foi agora realised° cam no ■ istems <strong>de</strong> 10 @Intrados. come meio do optimiser a <strong>de</strong>icers;<br />
<strong>de</strong> "glow" negative ea diminnir e distiacia entre mo<strong>de</strong>. pars um memo comprimento <strong>de</strong> catodo.O.<br />
reeultados confirmam totalmente o obtido anteriormente a moll= a compleni<strong>da</strong><strong>de</strong> do problems mob<br />
ao ap um. megun<strong>da</strong> si<strong>de</strong> <strong>de</strong> minimos nos interval°. temporsia pare proporgie ■ vealveis<br />
<strong>de</strong> N2 nu misters. 1st° nio tem, no moment°, enplicagin tearica.<br />
Trabalho parcialmente financiado par FIMEP a ClPq<br />
1.- R. <strong>de</strong> laced° Mends., J. L. <strong>de</strong> Sousa Oliva s C. A. lessons; 4th International Symposium on<br />
Quantum Optics, Nov Zealand (1986)<br />
2.- R. <strong>de</strong> !Sece<strong>de</strong> Meads", J. L. <strong>de</strong> Sousa Olive e C. A. Masson; !wrists Brasileirs <strong>de</strong> Vicuo 3, 16B<br />
(1985)<br />
3.- C. S. Willett; IEEE Journal of Quantum Electronics (Correspon<strong>de</strong>nce) 368 (1970)<br />
OTI/PAIMEI I ESTUDO DO MECAM1SMO DE commosio PASSIVO DE UM LASER PULSADO DE Ild:TLF*<br />
Wit Santiago <strong>de</strong> Assist*. !lima Au gusto Vicen ***** . Wagner <strong>de</strong> Possi ,<br />
Nilson Dias Vleira Junior e S aro Penba Hereto. (Inatitulo <strong>de</strong> P.m Enos<br />
81 Nuclear.. - 114.NICHEN SP.<br />
Seri donate a operatic do laser do Ild:YLF cm chevemento passive vtilisando no absent.<br />
d ' 1 <strong>de</strong> centres <strong>de</strong> I, on LiP. Imes centre. sin abtidos ono cristals <strong>de</strong> Li? ultra!!<br />
ros crescidos pela ticnica <strong>de</strong> refine per sons sob atmosfers <strong>de</strong> IF. Emss cri ttt i s sio setae<br />
irradiedom cos lei.e <strong>de</strong> elitrons, sendo quo us dos pre<strong>da</strong>tes <strong>de</strong> irradiacao sio os centres F e .<br />
Esse ■ centres possums um bands <strong>de</strong> sbaorcio larga, centred. es 960 um. ma bands <strong>de</strong> anima° con<br />
tra<strong>de</strong> no 1.12 um e no tempo <strong>de</strong> <strong>de</strong>calmento <strong>de</strong> . 100 no ■ i temperature ambience. Ji obtivemo ■ puT<br />
sos <strong>de</strong> duracao <strong>de</strong> 80 os no regime Q-snitched presentemente mum° ■ astu<strong>de</strong>ndo a influincla dos<br />
perametros <strong>de</strong> cio na operacim do loser mem regime a ■ poesivel uriliaacim no regime <strong>de</strong><br />
operacio "mo<strong>de</strong>-locked".<br />
* Cm apples <strong>da</strong> FINEP.<br />
** Balmier. <strong>de</strong> Doutoramento CAPES-PICO. UM.<br />
** Boleista <strong>de</strong> Meatredo CAPES-PICD, UP Itajubii.
Of UPAINEL J CARACTERISTICAS OE CIRCUITOS DE EXCITACAO PARA USERS DE N2 OE ALTA EFICIENCIA.<br />
2. Flo Co.... C. E. Fellows, A. Dias Tavares Jr. e C. A. Mesons, Laborenrio <strong>de</strong> Espec<br />
pin e Laser. Institute <strong>de</strong> <strong>Fisica</strong>. Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral Flumi CP 296. Niteroi, 24210 RJ.<br />
Poi publicado recentemente (1) no trabalho don<strong>de</strong> se obteve use ef'<br />
is <strong>de</strong> 32 no funcionamen-<br />
to <strong>de</strong> no lamer do tip° TB <strong>de</strong> N 2 . <strong>de</strong> baize pressio. Amelizando a posigio do minim <strong>de</strong> pot la-<br />
ses do mmissio no grificos do tipo "'monocle laser <strong>de</strong> emissio vs. emerge <strong>de</strong> excitscio" se <strong>de</strong>ter-<br />
mines= <strong>de</strong> variacio <strong>de</strong>uces minims no fungi° <strong>da</strong> pressio <strong>de</strong> N 2 no tubo <strong>de</strong> d ga a enr-<br />
gia <strong>de</strong> encitagio. Estes 'silicas moots= famIlise <strong>de</strong> setae cujas pen<strong>de</strong>nt ■ persists: a) ettu<strong>da</strong>r<br />
inn ' doe frequencies <strong>de</strong> mmmmm nimbi do circuitos excited:wee b) finalises ■ influincia dos<br />
valorem <strong>de</strong> impediecia do circuit° no comportment° do laser. Dist ■ modo. to ■ i<strong>de</strong> posmivel spli-<br />
cer Lou resulted°s obtidos em Cl) cm cambia os results:los do ttabalho <strong>de</strong> Meseta Kimura (2) no<br />
relacio aos velorss do impedinci parasite do circuit°.<br />
Trebalho prcialment fiemmeiado per PUMP CON<br />
1.- B. Oliveira dos Santos, C. E. Fellows, J. B. <strong>de</strong> Oliveira a Sousa C. A. Na ( A 32<br />
efficiency M2 laser) Applied Physics B ( A ■er publicido no 1987)<br />
2.- Z. Negate e T. amuse; J. Phys. A 6. 1193 (1973)<br />
T /PA1NEL<br />
OETEMMINACAO OE COMSTAMIES dPTICAS EN FILMES FINDS, Simla Bei= Nendis. FUNREC<br />
A =stir dm trebelhos doesenolvi<strong>da</strong>s pre .Aerlifecier Susnepoal sabre a mitodo dm curves<br />
=solvent= no &Unwiring:a <strong>de</strong> content= optima, <strong>de</strong>senvolvemas elgoritno computacianat a<br />
=limn= o no ne carectarisacie dm film= fin= clientele= dm intmrease no rebricscio dm<br />
filtrum Optic= interferancimis.<br />
Ateevie <strong>de</strong> =did= espectrorotssitriese. =flannels ■ trenemitincie dm wanamemdm<br />
<strong>de</strong>posited, no substrata <strong>de</strong> indite <strong>de</strong> =free= canhecido, s mita<strong>da</strong> pammibilita a <strong>de</strong>terminecia<br />
<strong>de</strong>s =natant= lotioa do mstariel <strong>de</strong>posits= : indica <strong>de</strong> rwtrugiu a, consume dm &mars= k<br />
espessurs do films d.<br />
No presentee trebelbm, =Dame as resulted= encanteadoe no carecterisecio do TiO2 a SiO.<br />
011/PAINEL icommuipo OE UN RING DYE LASER. Marcos L. Rannoch.' Luis A. 0. Nunes ijarbus<br />
7-Notro Nib Unit:Auto <strong>de</strong> Fields Quimic <strong>de</strong> Sio Carlos. usr).<br />
Eutaw, construindo um Ring Aye Laser continuo com compo eeeee s nacionais, a pereir <strong>de</strong> um <strong>de</strong>-<br />
senho f ido pato Prof. Clau<strong>de</strong> Guy <strong>de</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Perim IV. cos o qual obtem-so resolucies<br />
melhorea quo NH: (vier it eism abeixo). Oe elementos i 0000 cavi<strong>da</strong><strong>de</strong> s as componentes leis cmo<br />
ecalone. amines do compensano. filtros e spelhos foram <strong>de</strong>senvolvidos no Oficina <strong>de</strong> Otice do<br />
1FQSC. No momento estsmos erahalhendo na ales:ink ■ <strong>de</strong> satabilitacio e na monitorecio dos gagmentoe<br />
<strong>de</strong> sintonizacio par um microcomputador. Ales d ■ aplicno <strong>de</strong>uce laser no estudo <strong>de</strong> dfsitos em<br />
slidos. *stenos utilizendo-cm em no experiment° <strong>de</strong> espectroscopie <strong>de</strong> mid, en owes eilula<br />
<strong>de</strong> vapor <strong>de</strong> Alia. Deuces apizescae ■ po<strong>de</strong>rmos obter indicenes sabre utilizacio <strong>de</strong> <strong>de</strong>fitos<br />
co=o memoris isles sobss ■ i cio <strong>de</strong> itomos em superficial:.<br />
I Rae Of Mum (Ai<br />
2.4es Of count<br />
b. LYIIT FILTEA<br />
II Atrium& SE PARADN<br />
S FURY-PEW 1NTRAVIDA91<br />
6. RAG'S PAraLtLAI<br />
1 . ETALO £1110<br />
R00% Mums TSFERicos<br />
al. IMMO le NJ ►
01I/PAINEL CALCUL° E CONS11000 DI FILEN SIRREFRINCENTE Di PLACAS INCLINADAS FARA LASER<br />
DE CORAMTE. Eucle<strong>de</strong>s Harms Jr.. Ediveldo Cardoso/ Remit) C. Zilko (Institut° <strong>de</strong> <strong>Fisica</strong> a (WU- .<br />
ca <strong>de</strong> Sio Carlos. USP).<br />
Estado. c nnnnn uindo um filtro birrefrinaants <strong>de</strong> places inclinedss pars sso intrscavi<strong>da</strong><strong>de</strong> <strong>de</strong><br />
losers <strong>de</strong> 'ornate C.V. "single mo<strong>de</strong>". A performance do Ultra fol calculate ■travis <strong>de</strong> computador<br />
Fora s rrr r <strong>de</strong> subsidio I sum spmalrucie. 0 cilculo utilisa Estrin' <strong>de</strong> Jones conceits <strong>de</strong> <strong>da</strong>m<br />
poldrizasio <strong>de</strong>ntro <strong>da</strong> cavi<strong>da</strong><strong>de</strong>" al. Erroll sleatOrios <strong>de</strong> imps rrrrr orientagio ralativs antes as<br />
trim piaci" <strong>de</strong> quartz° qua cemp6em o filtro form introduaidos no cilculo. <strong>de</strong> musics a avaliac<br />
cam ester ecru ■fetam ■ efi r rr is <strong>de</strong> !Meagan. As plus" quo compliant a filtro foram orisua<strong>da</strong> ■<br />
atravi ■ <strong>de</strong> 11-2 e poli<strong>da</strong>s num pot" <strong>da</strong> Loaitach cam pa:statism° malbor qua 3'. Apin a<br />
montage= final. o filtro sari ("it'd° sum espectrefotimetro Cary 17 na cavi<strong>da</strong><strong>de</strong> do laser <strong>de</strong> toque<br />
gamma construindo. (FAFESP).<br />
(1) A.L. Moos. J. Opt. Soc. As. 64. 447 (1974).<br />
(2) C. Holton a 0. 'rescue, 1111 J. O. Mot. lima, 577 (1974).<br />
OTI/PAIMEL I TRANSIOES DE PASS EN CEUTA'S OR 14141ISO4 - A.R.M.Nartion.J.Nan<strong>de</strong>s Filbo.F.11;<br />
A.Melo ■J.E.Noretra F.A.Carmno - Dept, <strong>de</strong> Pri<strong>de</strong>d <strong>da</strong> UFCe.<br />
CrIstais <strong>de</strong> sulfates <strong>de</strong> Lido a *mania (NV41.11104) apraseutam ma trawls& <strong>de</strong> foss<br />
10°C e sutra a 166°C. Entre estas transis;es o material 6 Ferro-alltrico impaprio.<br />
Ma temper a ambience este material parlance as arupo "spacial Foa l (C:,). Segundo<br />
Foulet a Mathiso n) . spiv tranaisia <strong>de</strong> 10 °C o cristal puerto a um drupe cam simmis peacoat'<br />
C 2. No tomato. outros dotards (2) indicaram a possibili<strong>da</strong>d <strong>de</strong> qua o amp° 'spacial ma fats <strong>de</strong><br />
baixa tamparatura sorts <strong>da</strong> clams CL .<br />
Os resultados <strong>de</strong> eapalbamento Raman aqua apresentados revalue ass ambisoi<strong>da</strong><strong>de</strong> <strong>de</strong> for-<br />
me inequivoca. Rvidiuctan clarss <strong>de</strong> dobrameuto polar (fonoms LO a TO) indium quo ■ estruturm nao<br />
tam centre' <strong>de</strong> Inversio, eliminaado a possibili<strong>da</strong><strong>de</strong> <strong>de</strong> um strops poutual C.<br />
(1) - R.Poulet a J.F.Nathian - Solid State Comm. 21. 421 (1977).<br />
(2) - 0.T.Ifitsui.T.Shiroisht.M.Tabasbi<strong>de</strong>, Kato e 11.Same<strong>da</strong> J.10bps.Soc.Japem 39, 1143 (1973).<br />
WU/PRIEM.<br />
a<br />
Tommigfts Dg FAIR EN CRESTAIR Ell LLESOA - A.J.S.Olivaira J.E.NOrira.J.Nsm I<br />
-<br />
<strong>de</strong>s Filboa.R.A.Mile a F.A.Catano - Onpartsmatt <strong>de</strong> Ffsice<strong>da</strong> P.<br />
Cristmi ■ <strong>de</strong> dulfsto <strong>de</strong> lido pothole (111110 41 'pretest= virtu trataisies <strong>de</strong> Lass<br />
as temperaturas abates, dm 300K. A natured' dolmas transigues tem lido objeto <strong>de</strong> mita controvir-<br />
■la. Em particular. as transisaas quo ocomem a 2001 e 1601. quando o eristal S restriado, recebards<br />
virias Intarpretasies dlecordsules. Poi lug rids quo ■ treasisio a 2001 ■eria <strong>de</strong> 1 11 anima,<br />
levando a cristal do prupo especial Cg so 'repo Ct,. Into parsec comtradicar apneas observasies<br />
tom difragio <strong>de</strong> Liu -X. A trsosisio a 160E pseud ear do tip, form-elllgice e ferreiWistica .<br />
levando a ems tura ortorraabice. possivelmatte cos grupo "spacial C :.<br />
Om estudo extensivo d rrrrr transississ foi efetundo utillun<strong>de</strong> -se ticuicas do espelbs -<br />
mento Pam a medi<strong>da</strong>s <strong>de</strong> constant' dielitrice. Os resultados sugars, um explicasio peva Mum<br />
sisio <strong>de</strong> 2001 quo reconcilia is obserwas6as <strong>de</strong> espalbamento <strong>de</strong> lux a <strong>de</strong> rein -x. Rase mo<strong>de</strong>lo,um<br />
re -erranjo ripido dos Ions SO4- as torso <strong>de</strong> um situ parabola so sin -c do cristal torus possrval<br />
ma se:future aidia cos eixo C6 ums simmtris instantiate' Cl. also C3.<br />
A mends trumicia (a 1601). quo malamute lees a tam es rrrrrrr ortorranbics. p<br />
t er precedid ■ por uma fess intermairia, atravh <strong>de</strong> um trsonisio do tipo or<strong>de</strong>r-<strong>de</strong>sor<strong>de</strong>m. scar -<br />
rends is torn <strong>de</strong> ISM. Elsa transicio saris <strong>de</strong>vl<strong>da</strong> tto coa<strong>de</strong>lamsato <strong>da</strong> music impedi<strong>da</strong> doe foes<br />
■ulfato, mom um paqueno r-arranjo dos Ion, <strong>de</strong> steatite.<br />
D<br />
epute:onto <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> Moral do Marais&<br />
Campus do lacing. - 63.000 - Maranhao
OTI/PAINEL EQUAGOES DE TAXA E DIESTASIL1DADE OTICA EM LASER DC CO2 SEQUENCIAL. P<br />
Aka LLLLL Jr., J.W. Tabora a J. R. Rios Leite. Department° <strong>de</strong> Prince, UPPE.<br />
Apr mmmmmm reline asupprie<strong>da</strong><strong>de</strong> ■ ds hiestabili<strong>da</strong><strong>de</strong> <strong>de</strong> um laser <strong>de</strong> CO2 operando entre as Hahne<br />
regoleres a ■equenciais 11J a son<strong>de</strong> cheesed° per co _ea d ga, praise° name celula <strong>de</strong> CO2<br />
pure <strong>de</strong>ntro <strong>de</strong> cavi<strong>de</strong><strong>de</strong> dimmumio <strong>de</strong> revi<strong>de</strong>ds par veriarao <strong>de</strong> um suporte <strong>de</strong> espilho com piemoslitrico.<br />
Discutiremos as &quasi's <strong>de</strong> taxes <strong>de</strong> relarecio <strong>de</strong> populacio quo explicam o compertamento<br />
quasi-estitico a as oscilagoes temporai ■ possEvei ■ no 'Eames W.<br />
J.w. Tabosa e J.R. Rios Lake, Opts. Lett. 11, 566, 1986.<br />
[0 N.M. Gibbs, "Optical Instability : Controlling light with light", Aca<strong>de</strong>mic Press, N.T. L985.<br />
OLI/PAINEL ARIUT OE LASERS DE PRRP1L OE CANHO teeeeTtnn<br />
Theban Emilio <strong>de</strong> Almei<strong>da</strong> Santos, Sandro liercelo Rossil*Fra<strong>de</strong>rico OLas Nunes!<br />
T ' ha <strong>de</strong> Jesus Serra Mattes***<br />
* 81ebra Microel ice 3/A<br />
■ * Estagiirio na 81ebra Microsletranica S/A (IFCW - UNICAMP)<br />
*** LPG. UNICAMP<br />
Mil/sand:6 cilculom computacionain, ■ irmulamom a Influincla <strong>da</strong> temperature sabre<br />
o ganho, peall <strong>de</strong> portadores a indite <strong>de</strong> refracio <strong>de</strong> um Laser Array obtido a<br />
partir do Laser <strong>de</strong> ganho Lnvertido 1P.Prince e N.B.Patel)i Proceeding 100C-8833,<br />
2903-101. A partir <strong>de</strong>sta ■ curves, verificamos a possibili<strong>da</strong><strong>de</strong> <strong>de</strong> projetar Lasers<br />
<strong>de</strong> alto-potencia pare aplicacoes em diversas areas.<br />
OTI/PAINEL I OBSERIFACAO DE CAOS OETERMINISTICOS EM OESCARGAS ELETRICAS EN GA-<br />
SES. Thomas Braun', Jorge A. Lisboa', Ricardo E. Francke'e Jason A.G. Gallas'<br />
(Institiardi rmal niver- Siffial—FOWIT51RTO Gran<strong>de</strong> SUTT-e Diparrtaaeato<br />
<strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa Catarina')<br />
Nos mostramos que <strong>de</strong>scargas eletricas em gases sob excitacio D.C. po<strong>de</strong>m apre<br />
senior osci1acoes no corrente que assume, um comportamento caftico <strong>de</strong>terministic -6.<br />
E caracteriza<strong>da</strong> udil rota pare o caos via dobramento <strong>de</strong> periodo para <strong>de</strong>scargas seta<br />
<strong>da</strong>s num tube <strong>de</strong> PlOcker contendo he- lie. Esse sistema tambim apresenta triplamento -<br />
e quietuplamento do periodo que saguem ape's tima bifurcacio <strong>de</strong> periodo 2 pars o<br />
coos. Alin disso, ob sssss mos sequenclas <strong>de</strong> dobramento <strong>de</strong> periodo para <strong>de</strong>scargas<br />
abertas {"flowing systems").
OTI/PAINEL I DEPOSKAO DI PUKES FINDS AMORPOS C CRISTAL1MOS PELO RETODO SOL-GEL. !gilt<br />
Della Santina RoMillem e Michel Andre Ammeter. lamtituto <strong>de</strong> <strong>Fisica</strong> a Quimics <strong>de</strong> Sip Carlos, Uni<br />
wersids<strong>da</strong> <strong>de</strong> Sim Paulo. Cs. Postal 362. 13560 Sio Carlos. SP.<br />
ftilisamos o procamm 501-Gal pare <strong>de</strong>posigeo <strong>de</strong> muds@ films sobra vi<strong>de</strong>os<br />
cos eapeasura centrole<strong>da</strong>, pets !Au<strong>de</strong>n "dip-coating' a panic <strong>de</strong> molucies orgammaalicas. Preparamom<br />
cama<strong>da</strong>s <strong>de</strong> Ti02, 11i02, TiO2 -CeOg o cama<strong>da</strong>s colori<strong>da</strong>s <strong>de</strong> 5i02-2 m0D ce<strong>de</strong> R Co, Cr. Re.<br />
Fe a Cu. Descreveremos p <strong>de</strong> fabricacio, 'maim como ■ lgumms ■plicagies tecnologicas e<br />
discutlremos o ■ resultados obtidos. Peaquisa sulmencious<strong>da</strong> pole FAPESP, PUMP. CIIPq e CHER.<br />
OTI/PMEL I GRIASIO DE CERTROS DE COI DO TIPO Felt) ED HATRIZ DE ECI:Da. . Germano World<br />
45,1. *Nam= Sist Li (inmituto <strong>de</strong> <strong>Fisica</strong> e Quimica <strong>da</strong> Sio Carlos, USP).<br />
0 centre Fell) num matrix <strong>de</strong> EC1 consiste num contra F acopledo a duas imp <strong>de</strong> Ns. .<br />
visinbas maim proximal. Cristei ■ <strong>de</strong> aC1:14 . con contras F5(IT) rip utilixedos coma moil) cc cc <strong>de</strong> la<br />
sera na raga° do infravermelbo proximo. Com eats CrilLai a possival Wain eaidoi0 LaMar ■ iatOdiaSval<br />
COntio<strong>da</strong>seate MIA is 10 do 2.25 a 2,65 um. Como fonts <strong>de</strong> excitatio pods mar ntilisado um<br />
lamer <strong>de</strong> Ar em 516 nm. Mara e cristal cam este tipo <strong>de</strong> centro <strong>de</strong> cor seta ba tttttt emtu<strong>da</strong>do. es<br />
ticnicas pars produgio <strong>de</strong>stes ttttt or nip sae amplemenle divulga<strong>de</strong>s. 0 process° conbecido pars pro -<br />
dusir eat " polo irrsdiagio <strong>de</strong> bands F em Lorna <strong>de</strong> 514 no Iles ver<strong>de</strong>). No 0014O10, just.-<br />
mate coo F II (11) sio !arma<strong>da</strong>s o ttttt tips <strong>de</strong> <strong>da</strong> cor. <strong>de</strong>nominados ram a FA(l)<br />
quo competes ma absorcso do faits <strong>de</strong> excitagio do. centres FeIII). impsdindo a acao laser. Pala mil<br />
1ise do eapectro <strong>de</strong> ebsorcio. verificamos qua ums posterior irradingao do criatel as S90 no. <strong>de</strong>strai<br />
om centre. T AM increment. ma ttttttt ' DIM Sabo-se qua a irradiasio dos control'<br />
FA(1) Ism 590 am) provoca use reorientacio classes comm. Entio chegamos ■ conclusao qua a eaorieg<br />
taeie condos a um processo <strong>de</strong> ■igeria° do centre) FA(1). Una vet qua mote p <strong>de</strong> migesgio explies<br />
a sus <strong>de</strong>struigio pm. formagio <strong>de</strong> outros tipos <strong>de</strong> centers <strong>de</strong> car. Rio conseguimos ain<strong>da</strong> observer<br />
■ agio lamer no ECI:lhe tom F 11 (11) per falls <strong>de</strong> uma fonts <strong>de</strong> excitagio mess poteate<br />
Cu. laser <strong>de</strong> Ar . cmpo ' major quo IV). man cos a dominio dm ' <strong>de</strong> preparmcio <strong>de</strong>nte mein<br />
mite. conseeuimom no grand, awango pore exten<strong>de</strong>r o i lo <strong>de</strong> operagio do Laser do Centro <strong>de</strong> Cor<br />
quo d lemma a ji esti em funcionamento. (FMW. CNPq. MEP).<br />
En<strong>de</strong>rego atual: CTA-lEat - Divisio <strong>de</strong> Laser<br />
OTI/PAINEL 1 TRANS100 DE FASE TETRAGONAL-NONOCLINICA EH RDP-K.C.Serra e ,r.E.A.<br />
Halo, J.Nen<strong>de</strong> ■ Filbo..1.E.Moreira a P.A.Ce - Dept9 <strong>de</strong> <strong>da</strong> UPC.<br />
Cristai ■ <strong>de</strong> KH 2 PO 4 (CD?) eofrem uma transitio <strong>de</strong> uma fasts tetragonal pa<br />
es uma fame monoclinicm quando equecidoe <strong>da</strong> temperatera ambient@ a uma temp -<br />
ra acima <strong>de</strong> 4531C.<br />
Este trabalho epresenta uma marline's clara <strong>de</strong>ssa 'vie <strong>de</strong> lose atra<br />
vie <strong>de</strong> ob cies coma o eepalbamento Kaman. A temperature <strong>de</strong> transicio S forte -<br />
mente <strong>de</strong>pen<strong>de</strong>nce dm emostra do tratameuto titmice a qua ell i aubmati<strong>da</strong>. A fame<br />
Ifnica a meta-astivei a persimte du ttttt tempo molt* lonpo meamo quando o ms<br />
genial i 'rigi<strong>da</strong> <strong>de</strong> volts S temp mbiente em condigias controla<strong>da</strong>s.<br />
Depart/manta <strong>de</strong> <strong>Fisica</strong> dm Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral do Alagoas.
OTI/PAINEL I EU1SSIO VISRACIONAL DO CM INBUZIDO FOR ABSOlci0 DO corm F EM comas DE ECI<br />
IMPURIFICADO CUM OCN . Guillermo Gummin Nortek'. Niximo Siu Li (Institute d ■ Fisicm Willies <strong>de</strong><br />
Sio Carlos. USA).<br />
0 acoplamento <strong>de</strong> control F com imp diatimicas <strong>de</strong> CM- em SCI. fecilit ■ at r dm mbmorcio<br />
do F em S40 om ■ transferincia <strong>de</strong> eneraim pars o CN' persitindo i emismio vibracional<br />
Ilene silting es A.Bu. Realisamom um escudo do emisio sm funcio <strong>da</strong> ratio <strong>de</strong> centru ■ f<br />
orl presents do imp <strong>de</strong> OCN' introdusi<strong>da</strong>s involuntariament d ' nto do crisis!<br />
(MCI 1% KM. comparemo ■ motes resultadom cos amostres <strong>de</strong> maim mita p qua nio possum OCM".<br />
Os result/dos obtidos indicas uma concentracia <strong>de</strong> 6z10 16 em" do centres F coax a melbor<br />
tracio pars ob cao <strong>da</strong> 'Elisio vibracionsl. A p eeeee go <strong>de</strong>tecta<strong>de</strong> <strong>de</strong> 10' 4 mot do OW nio jails<br />
fl - i ■ do CM C000 era aereditado em o rrrrr trbalhom. (FAPESP. COPq).<br />
DTI/PAWL IMMO DE MIDAS OE DISSINETRIA OPTICA NA CERA DE CANNAUBA - A.4. <strong>de</strong> Paula<br />
G.A. Barbosa - Departamente <strong>de</strong> Fiske - Ins U7140<br />
Tondo em vista resultados ja obtidos por Correlacie <strong>de</strong> futon ■ ootres ticnica ■ qua <strong>de</strong>screvem a<br />
Cara <strong>de</strong> Carmauba no fame liquid. ammo commis ■glomormdom moleculeres gran<strong>da</strong>m <strong>de</strong> forme cilindri<br />
cm imersos em um liquid+, isotripico, tentamom ' <strong>de</strong> ticniem mails direta medi<strong>da</strong>s do tmmaoho e<br />
forma d glomorados. A dissimmtria <strong>da</strong> lux espalbs<strong>da</strong>. ratio du intenido<strong>de</strong> para doi ■ ingulos<br />
<strong>de</strong> espalhamento simitricom em relacie a 900 ■ formace <strong>de</strong> forma dirata mesas informacims. Nhatamos<br />
um statema optico-aletrinico pare =die a funcio d(6) I63)/10-1M<br />
Para Lector o sistsma foram [mites mmdi<strong>da</strong>s pars uma suspensio <strong>de</strong> esferam <strong>de</strong> poliestireno.<br />
Separamos ■ Cars <strong>de</strong> Carnaubm mm furies per cromatografi ■ liquids <strong>de</strong> colons estamos [amend° mmdi<br />
<strong>da</strong>m pars co<strong>da</strong> fracio combinacies <strong>de</strong> fracies.<br />
(ger tarbim secio dm paimiis).<br />
...'.71r;147rIEL7r<br />
ISM° DO PROCESS° DC GELIFICA00 DE SOL DE SILICA POR ESPALHANENTO DIMBNICO DE'<br />
LUZ. E.C._fiemath. D.I. don Santos. M.A. Ameartera. J.E.C. MOrira". Institute <strong>de</strong> Fimie ■ e<br />
Dolores <strong>de</strong> Sao Carlos - Univermidm<strong>de</strong> <strong>de</strong> Sio Paulo. Cm. Postal 369. 13560 Sio Carlo.. SP; Universi<strong>da</strong><strong>de</strong><br />
Fe<strong>de</strong>ral do Cesri. Cm. Postal I262, 60000 Foreman:a. CE.<br />
0 empsibmmento <strong>de</strong> Wm, estu<strong>da</strong>do em funcio do tempo a do infulo <strong>de</strong> empalhamnto.<br />
permits obter informacies dinimicam sabre oa proc <strong>de</strong> crescimento <strong>de</strong> partaculam. As medi<strong>da</strong>m<br />
do comficiente angular V d In g (q.c)/dtiq 0 dm funcio <strong>de</strong> auto- e loci* do campo elitrico dm<br />
lus empalhad ■ polar particular em sumpensio ,(11.0 ■ ( %( o,)). 11.(q0.) ) foroece a Lana midis <strong>de</strong><br />
relammtio <strong>de</strong> flutuseio ',spectral q 4. 1 men 0/2. Ap 'memos es rmultadom tee is<br />
mieroesferas m000dimp <strong>de</strong> silica es sumpeomio (Sol) prapara<strong>da</strong>a a partir <strong>de</strong> solocies ormnome-<br />
tilieas altomente bisicae <strong>de</strong> KNOS/ilcool/isum (.itodo <strong>de</strong> Saber). Ifismquimm pubmsoci eeeee palm<br />
FAPESP. CNN a FINED.<br />
▪
OTI/PAINEL<br />
IDETERNINA00 DOS PARAMUS 0! CAMPO METAL'S° DO Br NO AlC13<br />
C. Coots°. M. A. Pings. J. A. Senjudo, C. B. Siebert& a C. Restart (Instituto <strong>de</strong><br />
<strong>Fisica</strong> ■ Uniwersi<strong>da</strong><strong>de</strong> Estadual <strong>de</strong> Campinas - UNICANP)<br />
Experiment°s di foto lomi is <strong>de</strong> alt. resolucio, i temp <strong>de</strong> 13 K,<br />
pismires ■ i<strong>de</strong>ntificagio <strong>da</strong>m transigies entre os @sta<strong>de</strong>s '4 E3/2 - 4 115/2<br />
poo<strong>de</strong>ntes is imp <strong>de</strong> Ed* no camp° criatalino quasi eibEio do AlC13. As midi<br />
<strong>da</strong>m foram realiaa<strong>de</strong>s utilisando ■ Hobe 4850 X <strong>de</strong> um laser <strong>de</strong> Assisi°, um espec-<br />
trOmetro dor duplo e ■ ciente. <strong>de</strong> gem <strong>de</strong> I' par. a <strong>de</strong>tscgio <strong>de</strong><br />
lug emiti<strong>da</strong>. Os p <strong>de</strong> sesta, q e sgun<strong>da</strong> or<strong>de</strong>r; <strong>de</strong> comp° cristaiino<br />
foram dsterminados a ',astir dos aspects° ■ <strong>de</strong> luminescineia. Experiment°. <strong>de</strong> APE a<br />
4,2 K confirmsm roe o 'cica<strong>da</strong> fun<strong>da</strong>mental do 10 * cosrsspon<strong>de</strong> a um dubleto Kramer<br />
quasi isotripico cos a. SOO 2 0,03. As 'masers. foram prepara<strong>da</strong> ■ ■ portir <strong>de</strong> limalba<br />
■ <strong>da</strong> liga All_ m : Er ma (a. 0,1) ■ goal se Les sasgir <strong>de</strong>ntro <strong>de</strong> umo 'spore <strong>de</strong><br />
quarts° mum ?altar <strong>da</strong> C12 cos pressio a temp aaaaa so eontrola<strong>da</strong>s.<br />
1 0ecialmente finsociado para WIMP, C1114 a CAPES.<br />
OTI/PAINEL MIMS DE SATURACAD EM TEASSICOSE ATOR1CAS ESTIMULADAS POE LASER C.V. SIN70211<br />
WEL. AINANDO MIRAGE, IPEN/C11101/11P.<br />
Apresentsmos um mitodo para <strong>da</strong>trminscio <strong>da</strong> potisci as tic; em transicies<br />
estimula<strong>da</strong>s per loser. Descrevemsa ums esperlincis gods foram faitas =Man <strong>de</strong> absorcio /mica<br />
par Stomps assn discorso <strong>de</strong> catodo oco, wood° um loser continuo, mintosisivel, <strong>de</strong>alt' resolucio.<br />
Os colorsm do produto do seam <strong>de</strong> choque <strong>de</strong> ebsortio polo tempo <strong>de</strong> <strong>de</strong>esimento do nivel @Retro&<br />
(vs . 1) a <strong>de</strong> temperature dos Aromas foram obtidos pal. =Elise do perfil dm limbs <strong>de</strong> absorb:0.<br />
OTI/PAINEL I UMW DO En ol COMO Immo Ell GdA103. labottiio J.N. <strong>de</strong> Padua ■ Luis A.O.<br />
Jorbag_C. Castro Moto (Institute <strong>de</strong> <strong>Fisica</strong> a Wales <strong>de</strong> Soo Carlo.. US!).<br />
Atualmente eatn°. estu<strong>da</strong>nto Cu 43 come isposesa am CdA103. 0 ion trivalent. <strong>de</strong>lhirapio subs -<br />
titui o Gadolinso mote c r i rrr 1 fa esta autmetido a um eampo escalating' <strong>de</strong> simetria C m . Ea trabolbo<br />
‘ 1 / Lai mostrado, do espeetroscopia so ifravernelbo, gam ■ imetri ■ level Cm no<br />
C4A10 3. pods SIT asto<strong>de</strong><strong>da</strong> coma ms simstria cubic. (0b) submati<strong>da</strong> um. ligaira distergio Come per -<br />
turbos.° <strong>de</strong> or<strong>de</strong>m superior) coo mimesis C m . Nedi<strong>da</strong>s preliscimares op aspects° violasl dr sksor -<br />
cies <strong>de</strong> Cos3 em CdA103 mo aaaaa em as absorros do arca<strong>de</strong> ton<strong>da</strong>mental 7r0 pars as 'nu<strong>de</strong>s Dm. "D1 02 cos<br />
■ estrutors <strong>de</strong>vido so caw ' a lino do CdA103. Loses limbos <strong>de</strong> absorgio sio borrasca el<br />
trellis (<strong>de</strong>nted do resoling° do mpactrofotometro Cary 17) s argon.. <strong>de</strong>1a., sio sensiveis a variacio<br />
<strong>de</strong> tempera . neste trabolho preten<strong>da</strong>mos laser um estudo <strong>de</strong>tslhado do cristal ness ■ regiio<br />
.spectral, strove. <strong>de</strong> ticnices <strong>de</strong> luminescincia a Basso ostimulado, par. 'inten<strong>de</strong>r a foamsno<br />
<strong>de</strong>scrito. A tienica <strong>de</strong> Raman estimolado a mcolbi<strong>da</strong> per dor informagies sobre os niveis proximo.<br />
so estado fun<strong>da</strong>mental . per indusir ums coerincis entre os estadoa a screw astudsdos. po<strong>de</strong>ndo<br />
portanto <strong>de</strong>r informatics sobre os tempos <strong>de</strong> interagia.<br />
I) !lazuli'. V.S.; Nune"s. L.A.0.; Zino, S.C.; Scheel. n.J. in Castro, J.C. - "Infrared Electronic<br />
Transitions of to is GdA10 3 ". Sol. Stet* Cosmos. 2(O:27-30, 1954.
OTI/PCNEL I ocrEgRo OIICA DA RESSONANCIA NAGNKT1CA DO CENTRO e ER EC11511. pario Antonio<br />
Sonati e Nichol Amite Ammeter. lastitoeo <strong>de</strong> <strong>Fisica</strong> s Oulmics is Sio Carlos - Universi<strong>da</strong><strong>de</strong><br />
<strong>de</strong> Sio Paulo, Cm. Postal 569, 13560 Sao Carlos. SP.<br />
As proprie<strong>da</strong><strong>de</strong>s magneto-Opticas mediae gm sbsorgio do cestro <strong>de</strong> me F: OM<br />
-<br />
ECI:SN foram estu<strong>da</strong><strong>da</strong>s antes 1.5 20 K sob comps agnitico <strong>de</strong> 0 ate 5 I. A dotal° O<strong>de</strong>s <strong>de</strong><br />
realm:aim parsagnitic ■ (00PR) foi san<strong>de</strong>d& aas gags lag 2pou s long 2pgu e s tempo<br />
do relagagie ■pin-reds T1 foi <strong>de</strong>termined° em fungi° <strong>de</strong> tempera pars as condigies <strong>de</strong> res aaa a -<br />
cia. (etu<strong>de</strong>'a asks em se<strong>de</strong>seato pars <strong>de</strong>terminer a glacial° <strong>de</strong> I; a funds do canpo magnetics.<br />
Paquisa subvemiena<strong>da</strong> polo FAIMSP. CNPq 11112.<br />
7)21/1171DT IELREFLET1VIDADE NA CONJOCASA0 DE PARE CON LASER DE CO2. J.N. Tabors, Claudio L.<br />
Cesar, N. Outlay ■ J.R. Rios Leite. Department° <strong>de</strong> <strong>Fisica</strong>, Univerei<strong>da</strong>do Fe<strong>de</strong>ral <strong>de</strong> Pernambuco.<br />
Discutiremos a teori ■ e an<strong>da</strong>mento <strong>de</strong> experimental' <strong>de</strong> conjugal° <strong>de</strong> Pose <strong>de</strong> Reines <strong>de</strong> Laser<br />
<strong>de</strong> CO2 par mlseura <strong>de</strong> on<strong>da</strong> <strong>de</strong>genera<strong>da</strong> lives do efsito Doppler CB. Os gases usa<strong>da</strong>s sio SPg, CR2011<br />
e CO2 quests. Examlnaremos ■ <strong>de</strong>pend:nes <strong>da</strong> refletlel<strong>da</strong><strong>de</strong> do mole conjugador com a <strong>de</strong>ssintanisacio<br />
entre Lager s Trinacria rotraibracionals dos aliculas<br />
[] R.Fisher "Optical Phase Conjugation', Aca<strong>de</strong>mic Press. N.T. 1983.<br />
[2] R.L. Abrams e R.C. Lind, Opts. Lett. 2, 94, 1978; 3, 203, 1978.<br />
OTI/PA1N§L blUDANCRS DE EASE INDUZIDAS POR PRESSAO EM LAS. R.CENTODUCATTE -<br />
OFQ - USES - V.LEMOS - Institut', <strong>de</strong> <strong>Fisica</strong> - OMICAMP J.E.MOREIRA, J.MENDESFILHO<br />
▪ F.S.A.MELLO - DP - UPC.<br />
NH<br />
4<br />
Li SO<br />
4 (LAS) pertence a uma clause <strong>de</strong> materials ferroelAtrices nos quids ocorrem<br />
varies tranaicees <strong>de</strong> Ease estruturals com rotacio ou reorientacio dos radicals<br />
qusndo a temperature A varia<strong>da</strong>. Para este material dues transicoes <strong>de</strong> la or<strong>de</strong>m<br />
foram Observa<strong>da</strong>s <strong>de</strong> acordo com o esquemal Pnaza 186LS9C . Pna2<br />
O diagram' <strong>de</strong> fame P-T pare este material 6 limited° no extremo superior <strong>de</strong> pressio<br />
a 7 kbar a a simetria <strong>da</strong> fame <strong>de</strong> alto pressio a uma questio em aberto.<br />
Nos observamos transicoes <strong>de</strong> fain no LAS no interval. <strong>de</strong> 0 a SO kbar utilizando<br />
o espectro Ramon coma indicador <strong>de</strong> =<strong>da</strong>nces <strong>de</strong> simetria.<br />
Um dos fonons <strong>de</strong> vibracio <strong>da</strong> ro<strong>de</strong> <strong>de</strong>rivado do modo tipo v 1 <strong>da</strong> molecule lives mostra<br />
um comportamento muite peculiar com a premise() no intervalo <strong>de</strong> 21 a 36 kbar.<br />
Este comportamento a diacutido em termos doe modificacaes 0 estabillzacio <strong>de</strong>s<br />
Eases estruturais do LAS.
OTI/PAINEL I 0E0[00 DO flIDICE DE REF1A00 DE FILMES DIELgTRICOM<br />
Jo;o Carlos Cencio, Eidnei Paeiornik, Raul Almei<strong>da</strong> Nunes, Luis Carlos Coat<br />
ar■ Valente e Liss Carlos 5 do Corso % ['spiv <strong>de</strong> 140100, ructe.f<br />
Pretends-se medic a invite <strong>de</strong> refresio asp <strong>de</strong> film ■ <strong>de</strong> mteriais<br />
isolante <strong>de</strong>positaries vieue so ■ubstretes isolantes a weir do tlenic ■ <strong>de</strong><br />
reflect ccccc ia. Lux polerise<strong>de</strong> II. apliea<strong>da</strong> eon ;ripple <strong>de</strong> inciameim oonheei<strong>de</strong> e<br />
a inteesi<strong>da</strong><strong>de</strong> <strong>de</strong> lug reileti<strong>da</strong> i medi<strong>da</strong>. 0 periil <strong>da</strong> Istensi<strong>da</strong>d ■ <strong>de</strong> rtie:icy i<br />
compared° cos 0 obtido per um progress <strong>de</strong> eomputador 'conceal i<br />
Be<strong>de</strong> cum um valors qua is pretends medic.<br />
WI/PAINEL I KEDIDAS DE PROPRIEDADES MICAS E ELETRICAS DE FUMES METALICOS<br />
A.M. <strong>de</strong> A onto, K.N. Baibich a Flavio Horowitz. (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> UFRGS,<br />
YOU49—Por o ogre. RYT----- ------<br />
Este trabalho. em lase initial do montagem, visa fazer medi<strong>da</strong>s simultineas<br />
<strong>da</strong> refletincia iptica e resistincia elitrica <strong>de</strong> filmes metilicos durante sus <strong>de</strong><br />
poslCio em substrata a temperature amblente. 0 interesse principal é o <strong>de</strong> estu=<br />
<strong>de</strong>r a transicio entre a Ease inicialmente isolante (substrata) e a fase conduto<br />
ra. Durante este transido que servo observados os efeitos <strong>de</strong> allutinacio el<br />
nuclear -a° <strong>de</strong> 'ilhas' condutoras quo, tom a continued° <strong>de</strong> <strong>de</strong>posicao via crescer<br />
at chegar a percolated.<br />
0 monitoramento dm refletincie do filme em crescimento serf feito com laser<br />
HeNe (1.632.8 nm) i incidincia quase-normal. A caracterizado iktica <strong>de</strong>veri ser<br />
complementa<strong>da</strong> tom medi<strong>da</strong>s interferODitriCIS e polarimetricas apos a <strong>de</strong>posic-ao do<br />
films.<br />
As medi<strong>da</strong>s elitricas serio realiza<strong>da</strong>s utilizando um sistema <strong>de</strong> medi<strong>da</strong> dm<br />
condutivid<strong>de</strong> em corrente alterna<strong>da</strong> <strong>de</strong> bailie frequencia com <strong>de</strong>teccio sincrona<br />
e tempo <strong>de</strong> resposta muito manor que 6 segundos previstos pars a fait. <strong>de</strong> interes-<br />
SO.<br />
DTI/PAINE', 1 DETERS/MACAO IN VITRO DO raToe az reovaglio SOLAR DE PROMOS SRASILX1205.<br />
Stip° E. Cardoso. Lucas R. Alves. Michei_A. Aseerter. Institute <strong>de</strong> <strong>Fisica</strong> e Duimiem <strong>de</strong> Sip Carlos<br />
- Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Pio Paulo. Cs. Postal 369. 13560 Sio Caries, SP.<br />
Os pre<strong>da</strong>tes <strong>de</strong> protesio solar ■io esseeterisados per um aUsere inteire 2, 4. S<br />
etc. Por <strong>de</strong>finicio, este miner° ; a rasao dos tempos minima <strong>de</strong> ■pereeimento do elites' <strong>de</strong> psle<br />
recobert ■ <strong>de</strong> um produto a pale sem prated* quando submeti<strong>da</strong> a irradissio <strong>de</strong> los eltrayielem<br />
tipo Uva. Estes Inhere. mi. <strong>de</strong>terminados per medi<strong>da</strong>s in vivo. Deseroveremes as <strong>de</strong>nies. optics.<br />
use<strong>da</strong>s ma <strong>de</strong>termined° do Eater <strong>de</strong> prote<strong>de</strong> solar PAS in vitro s dsremos os remultados obli<strong>de</strong>s RE<br />
ra varies pre<strong>da</strong>tes <strong>de</strong> fabricedo enamel e estreaseirs. Peaquies sub 0000 iona<strong>da</strong> polo CNN, PAPEEP<br />
a Johnson I Johnson.
RESSONANCIA MACNgTICA<br />
Coord.:- Mgrio Engelsberg (UFPE)
RES/10:15/56.F EFEITO CEIENKOV MAGNETIC° NO CdCr 2 Se osnavAdo ATRAVIS DA EMS<br />
DO 113 Cd - J.C. f <strong>de</strong>s e J.B. <strong>de</strong> Oliveira e Sousa do Institute <strong>de</strong> <strong>Fisica</strong><br />
<strong>de</strong> Univ. Fed. aluminum a e U. Fink <strong>de</strong>s Si Akeisegesellsebert, RPA.<br />
0 Unite Cerenkov Magnetics consist. no excitagio <strong>de</strong> mignon. por<br />
pulse ■ <strong>de</strong> aaaaaa te elitrica em material. ■ cujos portadore ■ <strong>de</strong> to ■ sashes<br />
sltemobili<strong>da</strong>ds. A magostisacio, so recuperar 'sou valor initial apes o pulse<br />
<strong>de</strong> coirente, ram varier continuamente o campo biparfino do 113 Cd o quo aqui<br />
vale a usa varredurs <strong>de</strong> camps no come em quo a frequencies do espmetrimetFo<br />
i mantle!' fixa. Pare o CdCr 2 Se 4 ferromagnetic°. ■ RUN do 113 Cd s 77 K tem<br />
sproxima<strong>da</strong>mente 20o kHz <strong>de</strong> tenors. esti aaaaa a<strong>da</strong> on 101.12 /111s. ■ Isisa<br />
virile& polo coupe hiperrino 'spas o pulse do corn etc chrism a 11 <strong>de</strong> sou<br />
valor; <strong>de</strong> equilibria.<br />
Preten<strong>de</strong>mos nadir rrequencls <strong>de</strong> INN em fungi° do tempo <strong>de</strong>cor-<br />
rLds60ls pulse <strong>de</strong> aaaaaa te cuji Isrgura a do or<strong>de</strong>m <strong>de</strong> 1 us. Bete crab.-<br />
lho esti as &a<strong>da</strong>mants,.<br />
RES/10:35/5A.F<br />
RELAXACAO SPIN-NUCLEAR REDS EN VIDEOS. Efts' J.P. Santos e Mario Engeleberg<br />
(Department° <strong>de</strong> <strong>Fisica</strong>. °PPE).<br />
Os mecanismos do rola:eels spin-ro<strong>de</strong> em widrus no buixos temperatures tem si<strong>de</strong> objets <strong>de</strong><br />
consid 1 atengio. Em quasi so<strong>da</strong>s ea cases os nucleon estudsdos (11 11 , tia23, A." e mitres)<br />
possuem spin nuclear 1b1/2 e o mecanisso do relaxagio involve o memento quedroLsoler do allele° a<br />
is eradicates <strong>de</strong> campo elitrico nos posicee ■ nuclear's. Tames realised° =dile". <strong>de</strong> tempo <strong>de</strong><br />
selling:a spin -ra<strong>de</strong> T1 no vidros do tipo (Csf2)(0203)t- N observaodo ■ ressonancis do FLY<br />
(1=112) to temper aaaaa s 1.11EcT1100E. Os resultados sap comparados cos dodos epistentes em 11203<br />
vitreo (6 11 ) na mess !el <strong>de</strong> m temperatures. Tondo em vista qua no caso do Fly po<strong>de</strong>mos ignorer<br />
is ereitos quadrupoIsres as analogies es <strong>de</strong>pendincia ems a temps <strong>de</strong> T1 no ambos os casco<br />
permit's extrair sigmas concl em niacin as proposto mecanismo quo 'evolve os mo<strong>de</strong>s <strong>de</strong><br />
tuuslamento ceracterfsticos dos vi<strong>de</strong>os.<br />
RES/10:55/5A.F EFEITOS DE FLUX° OK rums IN IES SONANC1A MAGNKTICA. V.B. Pereira Leite. T. J.<br />
Senammba, A. T N. Psnetucci, C. J. Mason. N. A. Schmidt (Departamento <strong>de</strong> <strong>Fisica</strong> a Ciincia<br />
do. <strong>Materia</strong>ls. Institut° <strong>de</strong> Flisca e °eli<strong>de</strong>s <strong>de</strong> Sio Carlos, USP).<br />
Apneas. dm P - is Nagnitica sir aspens. hi motto tempo come umw ticnicm nio invasive e<br />
aperentemense simples pare se nadir flume <strong>de</strong>s fluldoa, ■ sea realists:* ns pritice nio e um<br />
reeked°. 1st° porque o flux° slats so ardidma por Ressonincia Magnetics <strong>de</strong> dire aaaaa s formes, quo<br />
<strong>de</strong>pend,. canto d ■ ticuice empregs<strong>da</strong>, comp do tips <strong>de</strong> fluxo analissdo. Aqui memos os principals<br />
e feites quo ap ■ nos experimentes por Nesseumeci ■ Nagnitica Nuclear, as simulacies dos meo-<br />
w s, bee come peamiveis usilisecie ■ <strong>de</strong>stos ereltos pera c medicio <strong>de</strong> 'luso. Reaultedos eeperi-<br />
senreis °hi<strong>de</strong>s ne espectrimetre d ivido no Laberatorio do lessemimcia Hamitic' do DICNJ<br />
IMISC/USP sae tambim ap ados. (VAMP. PIMP)
RES/11:15/5AS] GRRAci0 DR /HACENS FOR DIN RM CAKPOS ULTRADAIXOS. George Carlo. do Nascimento.<br />
Ricardo Immanuel do Sousa a Mario Engeleiter@ (Departanento <strong>de</strong> <strong>Fisica</strong>. OFPE).<br />
A geracio <strong>de</strong> imegems por RHN em camp. magniticos ultrabaixos irea quit minds pernenece<br />
pouco explors<strong>da</strong> mss que promets um <strong>de</strong>eenvolvinento rotor° hasten!, otimista. Nessus resulted°.<br />
preliminares implementatio do tecnice usaudo cosmos magniticos <strong>de</strong> 200 Gauss serio apreeentados.<br />
A inetrumentatso no <strong>de</strong>senvolvimento inclue, slim do equipamento <strong>de</strong> radio frequincias, a constru -<br />
tie <strong>de</strong> no eletromagmeto. 0 estigio areal do trabalho sera diecutido comp tanbin sues possiveis<br />
implicogoes.<br />
RES/1I :35/5AF 110111NA DE RF PARA osagAo RE !MACROS MDR 1101 - RESSOADOR LC DISTRIDWDO DE Will0<br />
PORTE PAM IS Nft. M. A. Schmidt. A. Tennis. T. J. Bousgambe, V. D. Pereira Laity. N.Panepocci(los<br />
tituto <strong>de</strong> <strong>Fisica</strong> e Quimica <strong>de</strong> Sio Carlo., Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo).<br />
lobinas <strong>de</strong> radiofrequinci ■ peva gerscio <strong>de</strong> lumens <strong>de</strong>ven produsir tempo magnetic° homogeneo<br />
pa reglio <strong>de</strong> amostra a fornecer no boa relate° sionl/ruido no cocaina° doe sinais <strong>de</strong> RON. Em frequencies<br />
alt.. o comprimento <strong>de</strong> bobina se torus ums fragio reaoavel do comprimento <strong>de</strong> ands. s o pro<br />
jet° <strong>de</strong> behind. nio pods ler feito unicamente tom base is parimetros concentrados. Este trabolho<br />
apre eeeee os resultados obtidos no Laboreterio <strong>de</strong> Re I. Magnetic' (IFOSCAISP), on<strong>de</strong> foram<br />
construi<strong>da</strong>s bobinas 'Era obtencio <strong>de</strong> imagen ■ <strong>de</strong> preton ■ em us limiest° <strong>de</strong> 2 Ti.!. (115 MX:). Estes<br />
bobina ■ consistem en um circuit° reason/ate LC. on<strong>de</strong> a ind mmmmm is e s capacItincia sio distribui<strong>da</strong>s<br />
<strong>de</strong> force que .s estrutura construi<strong>de</strong> poesua geometric eilindrics, e tambin pre<strong>da</strong>te camp° magnetite<br />
o nail hamogeneo possivet. A geometria cilindrie ■ foi adota<strong>da</strong> visando maxim aproveitsmento do espy<br />
co itil no interior do magneto. (FAPESP. FINE?).<br />
RES/11:55/5E.FIA STUDY OF NUCLEAR SPIN-LATTICE RELAXATION T 1 FOR 54 Mn IN THE<br />
ANTIFERROMACNETIC DIELECTRIC CRYSTAL HoC1 2 .411 20. Araiito<br />
Departamento <strong>de</strong> <strong>Fisica</strong>-UPC. a N.J.Stone - Clarendon Lib o y-Oxford-UK.<br />
A systematic study of the <strong>de</strong>peu<strong>de</strong>mce of the Nuclear spin-lattice relaxation of Mn 54<br />
present se a dilute nuclear impurity in HOC11.4H20 bee been ma<strong>de</strong> below 1 X, using the technique<br />
of low temperature nuclear orientation. Variation of T1 for the two antiferromapnetie<br />
sublet o i mmm is presented es a function of applied field and of temperature. in the region of<br />
the entiferromeenetic-spin flop transition.<br />
The dIfferinm applied field <strong>de</strong>pen<strong>de</strong>nce of T1 for the two magnetic auhlattices whose<br />
e lectronic assents are respectively parallel and antiparallel (up and down) to the external<br />
field have been interpreted in LOMB of unequal transverse fl Ions of the electronic<br />
spin and ■pin wave <strong>da</strong>mping. For the Mee <strong>de</strong>pen<strong>de</strong>nce, it is found that 1/TI<br />
as Ta with n a 1.40(2) and n 1.10(1) for the <strong>de</strong>mo and up sublettices respectively. It is<br />
shown that a simple spin wave approach is ina<strong>de</strong>quate to provi<strong>de</strong> ■ quantitative <strong>de</strong>scription of<br />
the relaxation phenomena near the antiferromegastic - spin flop transition.<br />
.....m■- ■T ■
RES/6:00/6A F<br />
ESPECTROS DE APB DE ANOSTAAS POLICRISTALINAS A PARTIN DE HANILTONIANOS<br />
EFETIVOS DE SPIN COY. INTER/U:10 INAORUPOLAA FORTE. A.R.Sobral, N.V.Vugman.UFAJ<br />
Hamiltonianos efetivos <strong>de</strong> spin,. introduzido per Abragam e Pryer (contend° as<br />
interacees hiperfinas magneticas).e bastante eficas no interpretagao dos experimentos<br />
<strong>de</strong> espectros <strong>de</strong> APE. Para obter solugees analiticas do referido hamiltoni<br />
one. use-se a teoria <strong>de</strong> perturbacio a<strong>de</strong>qua<strong>da</strong> (ease teoria conelete em splicer ro<br />
Raciest ao sistema <strong>de</strong> coor<strong>de</strong>na<strong>da</strong>s dos tensors g. A e apenas pare as direct:Nes<br />
principais do espectro. As fungoes resultantes envOlvem a convolusao <strong>da</strong> forma do<br />
linha do espectro <strong>de</strong> on monocristal e a intensi<strong>da</strong><strong>de</strong> <strong>de</strong> absorgio (obti<strong>da</strong> a partir<br />
do referido hamiltonlano) em fungi° do campo magnetic° aplicado e integrado sabre<br />
a auperficie <strong>de</strong> uma esfara unitaria.<br />
De posse <strong>de</strong>stas fungees anaItticam confeccionamos on programa <strong>de</strong> computador<br />
(Fortran) pare simular os espectros <strong>de</strong> p6.<br />
Nool000<br />
RES/6:20/6A.F<br />
NEDIDAS POR R.P.E. DA INTERAGIO QUADRUPOLAR 01 =maw DE 0111110 110110VALENTE.<br />
S.Na ' Junior a 11.9.Fusoma (Institut° <strong>de</strong> Finks <strong>da</strong> 1.111J).<br />
A nil's. por R.P.E. (Resgooinei ■ Paramagnetic Eletrinics) do complex° 11,090:8) r6,<br />
do em redo <strong>de</strong> KC1 a trradiado a 77K (Vugmen, N.V., Rossi. A.M.. Demon, J., (1973) J.Chem.Phys.687<br />
3152) Nostra a formscio <strong>de</strong> spicies peut-coor<strong>de</strong>nedsa instiveis a comparators embionte,que apes -<br />
sent= Interegio guedrupolsr Forte i<strong>de</strong>utificods <strong>da</strong> assimetria a ds superposicio dos B-<br />
ohn. centrals do multiplets hiperfino (Vugmsn, N.V., Wi<strong>de</strong>. A.O., Damon, J., (1973) ■ J.Chae.<br />
Phys., 59. 4418).<br />
O escudo <strong>de</strong> smomtras similar.' irrsdia<strong>da</strong>s a temp smbients mosses a formscio <strong>de</strong> es<br />
pecie ■ hess-coor<strong>de</strong>nados mom a di -clora<strong>de</strong>s, sat vets a temperature 'ablaut*. Rs sepia' mono -On=<br />
✓ed. temben foi i<strong>de</strong>ntificsds a presencs dm Interne° Quadrupolar Force (E.Ilartios Junior- Tess<br />
<strong>de</strong> Nestrado - Institute <strong>de</strong> <strong>Fisica</strong> -NFU -1985).<br />
Eaperlinciss reslisa<strong>da</strong> ■ a 12K, possibilltsrsm a medids doe components. do tensor quadri,polar<br />
na espicie di -clors<strong>da</strong>. Os valorem "nemato<strong>de</strong>s dos component. ■ dos tensor's g. A e P dist&<br />
&specie sio g, 2.6135, ge .1.9714, AL -291G. Af .492G. P .45GL P 54G a P...-99C. A interpretasio<br />
<strong>de</strong>stes cep <strong>de</strong> R.P.E. foi remIizsds utilisendo -se fetegoes lque dust/eves o comportment.<br />
do. espectros <strong>de</strong> R.P.E. as prising' <strong>de</strong> Interscie ■ Qoadropolsres Fortes (Vugnon, N.Y., Grid. ■ A.<br />
0., Janette, S.I., Malec. Phys. 35, 3, 7I5. 1970).<br />
Cabe<br />
quo meta i a palmitina wee quo me coosegue medic o valor dos component. ■<br />
do tensor quadrupolar per. um complex. <strong>de</strong> Osmio monovalent..<br />
Esti sends realisado in estudo comparative sistemitico cos bases no teoria <strong>de</strong> orbitals<br />
moleculmres, entre as 'species panto-coor<strong>de</strong>nsds ■ s boss-coor<strong>de</strong>nsds ■ mono ■ di-closed.' <strong>da</strong> Casio<br />
(I) e India (II). 1F1NEP, CNPq, arc -UFRJ).<br />
RE518:40/6R.F<br />
JESIUDO FOR RAE DE NOVAS ESPECIES BROMADAS DE atm DIVALENTE. C.G.A. Naito.<br />
p.V.Vugman (Institute <strong>de</strong> Ffeira-UFRJ).<br />
▪ irradiacio por galas-I, a temp. ambient. (f.A.) a a 7714 do Ion diamagnetic°<br />
Ir III (01)2' inserido en use reds <strong>de</strong> lar ■ produs pale winos duos especies psremogniticss difereness<br />
is N T.A., a coo configurscio 5d 7- - by ■pin.<br />
A printing espeeis <strong>de</strong>tected., o etmolszo pentacoonimnado Is II (01)1-. "presents gg .2,211<br />
g m em torn do 1.965 e Air-22.3C. A sogund ■ algae aucoutra<strong>da</strong>, o complex° monobrommdo<br />
10 1 (00 4 Br4 ", apresents ga -2,169, g o .4,965, Air-15,2G a A4r ■53.1G. A components paralels do ten<br />
sor hiperlino do 'roapiewo pentscoor<strong>de</strong>nads nip foi undid <strong>de</strong>vido a superposices tom o complex° mm<br />
brooado, po<strong>de</strong>ndo-ac opens. "stung. a components persistm do tensor g .<br />
At aaa a do estudo <strong>da</strong> vorimgeo angular, observmmo ■ quo ambits as especies "premiums si<br />
na<strong>da</strong> maid). Foi medi<strong>da</strong> tambim, a components perpendicular do tensor superhiperfino do nitroge-<br />
nio do ci aaaaa axial, quo vele At.1■41,6 G pars ambit. se @specie*.<br />
Estamos investigando a interacao quadrupolar forte (SQI) nos shin ■ do iridio a do brow<br />
na espicie nombroun<strong>da</strong>ii qua ambos ap memento <strong>de</strong> quadrupole alto. Mita malls. esti ■end°<br />
rein cui<strong>de</strong>dosamente pois a 'specie monobroma<strong>de</strong> 'mantra-se pareislments retobert ■ pals 'spiels<br />
peotacoor<strong>de</strong>nalm. Po<strong>de</strong>mos 4 ttttt mr pores. in feito conjugado <strong>de</strong> SQL con o ligents a tom o metal,<br />
tam Unica us li<br />
(MEP, CNPq. CEPG-1101.1).
RES/9:00/g 7-1 ROTULACAO DE FURORS BASE DAS IRREPS DOS GRUPOS DOPLOS PONTUAIS<br />
CRISTALOGRAFICOS- A.O.Caridc, S./.Zonetto a S.R.A.Nogucira -<br />
Neste trabalho mostramos como pods ser faits a rotulacio dos representacoes irreduziveis<br />
<strong>de</strong> grupos duplos pontuals cristalovrAficoa a <strong>de</strong>s suas bases correspon<strong>de</strong>nces,<br />
construindo um operador autoadjunto unico, qua rotula gtravis <strong>de</strong> semi<br />
autovalores, com a vantagem <strong>de</strong> que ester autovalores po<strong>de</strong>m ser eseolhidoe cal<br />
qua sompre evi<strong>de</strong>nciam s <strong>de</strong>scencifincla em simetria numa sequancia <strong>de</strong> subgrupos. 0<br />
metodo pods ser extendido a sequAncian que incluam nao apenea grupos finitos mar<br />
Umbem grupos compactor, jig qua ales poesuem irreps unitArias do dims:lei° finita<br />
RES/9:20/6A.F ISTUDO POE RAE DE F. 3 ' EM (NR4)2 In CL 5 R2 0<br />
G.S.M.Parcitl (PUC S.PAULO). A.Piccinl a R.R.Rechenberg (1FUSP)<br />
medi<strong>da</strong>. <strong>de</strong> RPC do sal (A14)2 Fe C1 5 11 2 0 diluido no sal isomorio <strong>de</strong> In<br />
mm tam <strong>de</strong>pend:aria angular astu<strong>da</strong><strong>de</strong> per Misr. (1).<br />
Especero ■ po<strong>de</strong>m ser explicados par dois ■ itLo ■ nio equivalent.. no piano<br />
me corn o also s fasendo 400 com o else a. Pars os doia sitios o eiso<br />
coinci<strong>de</strong> cos o eine b.<br />
Voriando a temperature <strong>de</strong>eds a ambient. ati a do nitroginio liquido <strong>de</strong>ter-<br />
■ iasmas a voriatio dos Hanger°. <strong>da</strong> hamileoniana <strong>de</strong> ■ oin.<br />
(1) S.R. Niars and G.R.Sharp, .1.Chem. Ploys. 66, 4172 (1977).<br />
RES/9:40/6A.r I LEINuOTAPIENTO OA SUI- AliA OE RESSONiNC1A MAGNETICA. Mario Engelsberg„ Deport.-<br />
mono <strong>de</strong> <strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>r.' <strong>de</strong> Pernambuco, 50.000 Recife, PS.<br />
Foresee um inform sabre o 1 anent° <strong>da</strong> <strong>Fisica</strong> Dresileira patrocinado polo SRI' na Area do<br />
<strong>Fisica</strong> <strong>da</strong> Aseiria Goa<strong>de</strong>ara<strong>da</strong> Sub-Area <strong>de</strong> Ressoniscis Eagaitica. Resuairesos o relatirio womentool°.
RES/10:15MAX] ESTUDO FOR RPE DA TRANSFORMACAO DE MSC es-6 FM CRISTOSALITA<br />
A1P0 4 Ronaldo S. <strong>de</strong> Biagi a Alvaro Steams (Segiq <strong>de</strong> Engenharia e Clincia <strong>de</strong>s<br />
<strong>Materia</strong>ls, Institute Militar <strong>de</strong> Engenharia. Rio <strong>de</strong> Janeiro, RJ).<br />
Na faixa ds temperatures em qua ocorre a transformagio <strong>de</strong> fess reverelvel<br />
a-6, o espectro <strong>de</strong> APE <strong>de</strong> amostra ■ <strong>de</strong> cristobalita ALPO, apresenta uma linha v<br />
cuja intensi<strong>da</strong><strong>de</strong> a proporcional a fragio <strong>de</strong> fame B presents na amostra, <strong>de</strong>termi -<br />
na<strong>da</strong> por difragio <strong>de</strong> raioa-X. Eats linha i atribui<strong>da</strong> a us <strong>de</strong>feito eletrOnico que<br />
esti presents apenas na face B do material.<br />
RES/10:35/6A.F1 ESTUDO FOR R.P.E. DA FORMACAO DE CENTROS DE V2* Eli Mg0<br />
Antonio Alberto Ribelro Fernan<strong>de</strong>s (Secio <strong>de</strong> Eng. a Ciincia dos Materisis-INE-RJ)<br />
No presence trsbElho, fel estu<strong>da</strong>do, *trivia do ticnica <strong>de</strong> ressoninci ■ paramag<br />
netts& eletrinica (R.P.E.), s formaceo <strong>de</strong> contras <strong>de</strong> V 2* produzi<strong>da</strong>s por irradimio<br />
em iaido <strong>de</strong> magnesia policristalino. Varificou-se que pars amostra tom maiores<br />
concentracoes <strong>de</strong> vanidlo memos centres <strong>de</strong> vanadio divelente seo produzidos pars<br />
um meSmo tempo <strong>de</strong> irradiscao.<br />
RE5/10:55/6A.T1 RPE OA 1NPURELA No" NO AlC1 3 - 01C. O. Coats°. B. Rolla. O. E.<br />
Barberis e C. tettorl (Institute <strong>de</strong> <strong>Fisica</strong>. Ualvecsi<strong>da</strong><strong>de</strong> Istadual <strong>de</strong> Csmpinas).<br />
Ruperimentos <strong>de</strong> RP! um Ban<strong>da</strong>-11 es ispureaas do No" no ALCI - CIC.. ■stink,<br />
2, Nostra que es ion. No" optic num mitt* <strong>de</strong> closest. aziel Co. coo isus eisos <strong>de</strong> ■imetria<br />
perpendicularse is cams<strong>da</strong>s do carbons. 0 "spectre ceaseless ds 31 'Wham <strong>de</strong><br />
is do tips Oysonisna ■ pon<strong>de</strong>ndo is ersosigies seer. os sIvels do esfine<br />
e hiperfina do multiples° (S ■ 5/2 e X ■ 512) do No** e i re ssss n tie<br />
dos spins porsadores <strong>de</strong> carat (CCU) con valor isoteSpico <strong>de</strong> a ■ 2,0020. Os pease-<br />
[ro ■ do Hamiltonian' <strong>de</strong> Spin usual pace siseeria axial forms obtidos por ■juste <strong>de</strong><br />
minima" quadrados pars a vsriagio insular doses. 30 linhas. i temperature ambient%<br />
■endo 1,9997; gr - 1,9973: 154,9 Gauss; s ■ - 1,7 x 10-4 Gauss, AL ■ 81 Gauss a<br />
?yr BB Gnus.. Vale a pens remitter que, no quo sop concerns, este foi's primaira<br />
observecio do espectro ds RTE <strong>de</strong> fins a biperfina, complesament" resolvi<br />
do, do No" num' matrix Basilica.<br />
Supers, fi fro: TAPEBP e CNPq.
RES/11:15/6A.F I CORRELA00 ENTRE OS DEFEITOS RESPONSAvE/S PFLA TERWILIPIINESCENCIA<br />
(TL) E ESR OA CALCITA - Sonia liatsue Tatmmi(TFUSP), Plasm) Matsuoka(IFUSP) e Shigueo<br />
Watanabe(IFUSP).<br />
InIciamns um trabalho <strong>de</strong> <strong>da</strong>tacin por DTL(Onsimetha Tormnluminescente)<br />
e ESR <strong>de</strong> um peca <strong>de</strong> °stalagmite, retlra<strong>da</strong> <strong>da</strong> Caverns do Diabn-SP. Um don<br />
problemas importantos no <strong>da</strong>tasao per gates mitodos i a establlicla<strong>de</strong> a tenneratura<br />
ambiente doe <strong>de</strong>feitos responsaveis pelos lanais <strong>de</strong> TL e FSR, nue foram induaidos<br />
na amostra por radiacio natural, portanto <strong>de</strong>vemos i<strong>de</strong>ntificar e conhecer as prn-<br />
Prie<strong>da</strong><strong>de</strong>s dos <strong>de</strong>feitos em questa°.<br />
A amostra forneceu <strong>da</strong>is pima TL distintos nue aoarecem naCcurva<br />
<strong>de</strong> emtattio, corn temperaturae <strong>de</strong> 261 °C e 334 °C e tree sinus dminantee corn g<br />
2,003; g 0 2,005 e 2,013 que aparecem no espectro <strong>de</strong> ESP medido a temperature<br />
aeblente; notamos que os doim prlmeiroe valores <strong>de</strong> g coincl<strong>de</strong>m corn os dos contras<br />
Core CO; respectivamente e o terceiro é um centre, ain<strong>da</strong> nan i<strong>de</strong>ntiElcado.<br />
Alguns pesquisadores(como T.Cal<strong>de</strong>ran, et a1.19R4J.Phys.C:Snlid<br />
State Phys.17 2027-2030) relacinnam n pion <strong>de</strong> TL <strong>de</strong> 250 °C <strong>da</strong> calcite corn n mina'<br />
<strong>de</strong> g 2,00T<br />
Atravfis <strong>de</strong> tratamento tarmico e irradiacao corn radiacTio wine este<br />
egos tentanto encontrar tal correlacao Instep e<br />
RES/11:35/6A.F I APLICACOES DE RPE EN ESTODOS OE INTERESSE A ACROPECUARIA. Ladislau Martin Me<br />
toj Luiz Alberto Colneso (EMBRAPA-1.1APOIA-Sio Carlos/SP); Ana Rita A. Mo uelrn(EmBRAPA-OEPAE-Caine<br />
Posts! )39 - Site Carlos/EP); Luiz A. Risen (EMBRAPA-014/1 , - Celia Pasta 130 - !lento Conceive.-<br />
RS) a Otaciro E. Begelman° (Innieuto <strong>de</strong> Mice e Quince <strong>de</strong> Sio Carlos - USP - Cain Postal 369<br />
Sao Carlos/SP).<br />
Escudos <strong>de</strong> ■plicacoes pry:tics. <strong>de</strong> Ressonincia Paremagnitica El - ice (RPE) is estop is esti°<br />
■endo d ivldos pal ■ Ilni<strong>da</strong><strong>de</strong> dr *polo a Perinea s Desenvolwimento <strong>de</strong> 1 Agro<br />
p la (UAPD1A). dm EMBRAPA (Empress Brasiletra <strong>de</strong> Pesquime Aarop to) em colsb aaaa io corn o<br />
Institute <strong>de</strong> <strong>Fisica</strong> e Quince <strong>de</strong> Sio Carlos - USP - Eio Carlo.. Em um doe projetos 00000 n<strong>de</strong>-se cm<br />
tzar e <strong>de</strong>terminer mi tri eeeee (fess <strong>de</strong> Mn"; Cu"; Fe" e ) em solos e plant... U<br />
ellizando um espectrametro Varian E-)09. Bonds X (9CHz) manias <strong>de</strong> alpine solos ji forme analisa<br />
<strong>de</strong>s a observou-se. principalmente. o ion Na. " T less <strong>de</strong> analisar o solo lntaeto estio send;<br />
faits.. porim dificul<strong>da</strong><strong>de</strong>s surges <strong>de</strong>vido as elevm<strong>da</strong>s convener aa 6 ee <strong>de</strong> ions metilicos. As aniline<br />
<strong>de</strong> folbms. ralzes s grios este° undo inIcie<strong>de</strong>e. Em um outro eared° tentn-se a caracterincio<br />
<strong>de</strong> vinhos. produndoe pale propria EMBRAPA, dm ticnica <strong>de</strong> RPE. Madi<strong>da</strong>s preliminaries most<br />
aaaaa a presence <strong>de</strong> lone <strong>de</strong> Mn" e Fe" .<br />
RES/11 :53/5A.F I AMUSE OE FUNOICLOA COPRIco POR RPE R.A.S. Heger, M.V.Vugman (institute <strong>de</strong><br />
<strong>Fisica</strong>-OM) e .1.1).figneros Biller (Seilyirr—'—<br />
cautsuca IME.4J).<br />
A fungici<strong>de</strong> C 1611 14 08C., complex° <strong>de</strong> cobre do ieido <strong>de</strong>hidrommetico. fat analysed° per<br />
RPE Oluxxoniuela Paramagmhica El ire) em ban<strong>da</strong>-X no estado ■aid° (em form <strong>de</strong> policristale)<br />
a dissolvido em clorofarmio.<br />
Has amo poli aa i aa aline o Cut' apresent ■ um g corn tempo proxima<strong>da</strong>nen<br />
to in<strong>de</strong>pen<strong>de</strong>nt." <strong>da</strong> te rrrrr tura <strong>da</strong><strong>da</strong>s per g..2.251<br />
A teatime dos espectros <strong>de</strong>s 'mown em molucio a vi r i rr temperatures esei son<strong>de</strong> itit4<br />
e <strong>de</strong>stacam-se os seguintes aopecios :<br />
(i) 0 valor do <strong>de</strong> acoplamento hiperfino isoeripice pare a solucio ago conge-<br />
constant.<br />
la<strong>de</strong>, cm tempo mbiente, a dodo per A. /bC sendu v2,129;<br />
(ii) Arial <strong>de</strong> 210K limbs' do Cut' ap . m um cleite dr relax:10e opin- spin<br />
<strong>de</strong>pen<strong>de</strong>nt' <strong>de</strong> temperature;<br />
(iii) Abaixo donna temper aaaaa observe - se ma modificacio dos espertros <strong>de</strong> vi<strong>de</strong> ao<br />
efeito <strong>de</strong> "slow-tumbling";<br />
(iv) Medi<strong>da</strong>s a temperature <strong>de</strong> nitrogCnie liquid's, pare non anilise oais complete do si<br />
do ondo sti localized° Ca'. r son<strong>de</strong> rcaliza<strong>da</strong>a. inclusive nedi<strong>da</strong>s no ban<strong>da</strong> -q.
1.<br />
RE5/PA1NEL l ESTABILIDADE TERMICA E ELIA VIDA DE DEFEITOS PARAGNETICOS PRODU2I-<br />
DOS PELA RADIACAO /ONIEANTE EM CALCITAS NATURAIS: /NPLICACOES A<br />
GEOGR0Hotccia PO % EPR<br />
A.Ronsi 1 ------ , G.Poupeaul.2, A.Rivera l , J.Danon l [Centro Brasileiro <strong>de</strong> Seequisas FIsican<br />
; e Institut Dolomieu a U.A. 69 CNRS, Grenoble/Franca 2 1.<br />
A radiacio natural produs, em calcites, centros paramagniticos nue po<strong>de</strong>m ser<br />
<strong>de</strong>tectados por CPR. Eapectros <strong>de</strong> amostras irradia<strong>da</strong>s no laborstario com rains y<br />
sio ■ imilare ■ aos espectros <strong>de</strong> &mantras irradLa<strong>da</strong> ■ pale radioativi<strong>da</strong><strong>de</strong> ambiente<br />
rains clismicoa.<br />
Realizamos experienciax do aquocimentos ixotermicos cm calcites entalagmlticas<br />
naturals nfia irradla<strong>da</strong>s Icaverna Arago-Franca) a irradia<strong>da</strong>s no laboratorMaiea<br />
verna Santana-Sio Paulo). /nvestigamos o comportsmento termico <strong>da</strong>m especles h1 e -<br />
h3, geralmente utiliza<strong>da</strong>s na geocronologia por EPS. Obnervamos clue: 1) em use <strong>da</strong>m<br />
amostras, coma a previsto pelo mo<strong>de</strong>l° <strong>de</strong> Yokoyama at al 11992) os eletrons assoela<br />
dos a linha h3 se redietribuem nos shims h1, entretanto esta redistribuicio nio<br />
oeorre em outras calcites. 2) o <strong>de</strong>felto amsociado a h3, possai energia <strong>de</strong> ativaam<br />
a fatore ■ pre-exponencial que po<strong>de</strong>e varier <strong>de</strong> amostra pare amostra <strong>de</strong> 1.3eV a<br />
1.5006.900 12 a 1.4x10 12 respectivamente. Como consequancia <strong>de</strong>stan valores a<br />
mcia vi<strong>da</strong> pare as eletrons h3 a 1500 po<strong>de</strong> entio varier <strong>de</strong> 5:110 4 a 2x106 anon. Dis<br />
cute-se no trabalho as implicaams <strong>de</strong>stes resultadce na <strong>da</strong>tacio por BPS.<br />
Yokoyama, Y at all C. R. Acad. lei. Paris 294, 759 11982).
RES/PA1NEL<br />
RESSONLNCIA MANTICA NUCLEAR DO 157 Cd EM C4Al 2<br />
I. S. Oliveira * . K.K.B. Alves, UM. e A.P. cuimarees, CBPF<br />
A KMN do 157 Cd (1.312) em GdAl 2 permit, estu<strong>de</strong>r as interaque ■<br />
hiperfinss e a relooacio outlasr no nUcleo <strong>de</strong> um* terra rare estado<br />
5, em um sitio <strong>de</strong> alto eimetria.<br />
0 espectro hiperfino obtido a 4.2 K consists <strong>de</strong> um pico eztrei<br />
to (largura aproxima<strong>da</strong>mente <strong>de</strong> 0.1 MHz) do em 27,05 = 0.0271110<br />
com dole satiilites qusdrupolsres afastados cerca <strong>de</strong> 0,7 MHz. A ori-<br />
'gem do grad' <strong>de</strong> tempo eli aa i aa ■ entido polo aUcleo do gedulinio<br />
ums questio tont rrrrrr I<strong>da</strong>, ■ endo Gm Wee esplica<strong>da</strong> pela contribu<br />
isio dos elitrons nio-5 (5d 6p) presentee neste satin.<br />
Estamo ■ estu<strong>da</strong>ndo a relmtscio nuclear no 157 Cd em ruosro <strong>da</strong> po<br />
tincia <strong>da</strong> rf aplica<strong>de</strong>. 0 tempo <strong>de</strong> relaxacio TI i redid* ■ partir<br />
dos ,cos est imulados e T2 obtido pals sequincia <strong>de</strong> Kelm. Ob mos<br />
qua us tempos medidos <strong>de</strong>pso<strong>de</strong>m <strong>da</strong> p is, efeito qua esti essoci-<br />
ado a diferenca entre os pr <strong>de</strong> relatacio nos dominion e nos<br />
para<strong>de</strong>s <strong>de</strong> Bloch. UM2 variacio <strong>de</strong> um fator <strong>de</strong> 100 na poancia apli-<br />
ca<strong>da</strong> rr n<strong>de</strong> a um fator do *e<strong>da</strong>m <strong>de</strong> 2 em T2 a 4,2 K.<br />
a Aluno <strong>de</strong> memtrado do CBPF
SENICONDUTORES<br />
Coord.:- A<strong>da</strong>lberto Fazzlo (MAP)
SEn/3:00/4A.F 1 IMPLAMTACAO DI IONS DR Au Ell GaAs: MOM DA DiSfinsulad liSPACLAL II SUA IVO<br />
LUCA° COM 711ATAKENTOS TERM1COS. C.A. Oliviari (D. Plains - DFSCar - S. Carlos - SP), R.P. LLVi<br />
Firica - UFRCS - Porto Alegre - RS). P.C. <strong>de</strong> Prince (I. Fisics - OVICAMP - Campinas - SP) e<br />
J C Gal i (D. <strong>Fisica</strong> - UFSCar - Sio Carlos - SP)<br />
foram.implanta<strong>da</strong>s a <strong>de</strong> GaAs eon ions <strong>de</strong> 197 Au cam soorgia <strong>de</strong> 200 haV doss igual<br />
a 10 1' visando os seguintes objetivos: (i) temporar a alcance projetado R p a o <strong>de</strong>svio pa-<br />
drio dm distribuigio especial dos ions implantadm 16 nom as previsass Inulads. pelf<br />
programa TRIM (Transport of Ions Matter), <strong>de</strong>senvotwiRe por Diersack a Ilsgemark; (ii) verificar<br />
a difusio do Au Implants:he, 'pis aaaaaaaaaa termite <strong>de</strong> 1 bore. a ISO. 200. )30. 400, 500 e<br />
600 °C. A tonnina <strong>de</strong> medl<strong>da</strong>s foi a <strong>de</strong> !spectroscopist di Retro-espalbamento <strong>de</strong> Rutherford (1111S).<br />
nom partIcula ■ alt. <strong>de</strong> SOO kaV esoalha<strong>da</strong>s a 160 em dirogio do Iola. inci<strong>de</strong>nce. Os resuit:Woo<br />
obtidos foram: R p 540 R s 1 340 L. Ds rasultados dg. tratamento ■ tirmicos -nos mos -<br />
tram qua ate 300 °C nio ocorreu nenhuml difusio do Au. Ji a 400 C. o perfil se cornea msis largo<br />
a sofreu um ligeiro corrimento en direcio a superficie. Um medi<strong>da</strong> <strong>de</strong> canalizacio (channelling)<br />
mostrou que parte <strong>da</strong> nomads amorfisa<strong>da</strong> polo Implantacio haul ■ si<strong>de</strong> recristalisa<strong>da</strong>. Este *-<br />
fait° tem ■ ido observado em amo aaaaa trata<strong>da</strong>s por maim <strong>de</strong> 50 minutes. em tmaperaturas ■ partir<br />
<strong>de</strong> 3S0 °C. Apia aaaaa mento a SOO °C ■ 20: do Au seasegou pan a superficis. e a recristatilacio<br />
<strong>da</strong> nammla smorls foi qusse total. Fit:atm:ate. a 600 C. co<strong>da</strong> o Au segregou pars a superficie <strong>da</strong><br />
smostra. Oasts ■ resultsdos prelimf po<strong>de</strong>mos comeluir qua Au basicsments aim difun<strong>de</strong> no<br />
GaAs. a que o <strong>de</strong>slocamento observado a mirth. <strong>de</strong> 400 C mitt i tirmico a sic provocado pale movi -<br />
mato <strong>da</strong> interface ca' 1 -amorfo en diregio i superficial.<br />
SEM/13:20/4A.F SISTRMAS DR 11-1111GATIVO BM WORMS DR METALS DR TRAMSICIO CM<br />
SEMICONDUTORRS. Sonaldo Mote (Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Santa Me-<br />
els) a A<strong>da</strong>lberto FMZELO (Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Rio Paulo - Rio Paulo).<br />
Ussodo o formatismo do Rsl<strong>da</strong>ne-An<strong>de</strong>rson @etu<strong>de</strong>s°s a possibili<strong>da</strong>ds <strong>de</strong><br />
obter misters. <strong>de</strong> U-negative so impuresas <strong>de</strong> metals <strong>de</strong> tronsicia em ■emicondu-<br />
tones. E proposto. memo se ■ incluir a i pie elitron-re<strong>de</strong> ■ a ocorriocia ds<br />
U-nagativo comp consequincia d ■ hibridisscio imparess-baspe<strong>de</strong>iro pars aspli-<br />
csr porqus alpine *sta<strong>de</strong>s <strong>de</strong> azi<strong>da</strong>gio podso sitar <strong>de</strong>sapareeidos osstes<br />
SEM/8:a0/4A.F IIMPUREZAS OE NETAIS DE IRANSICAD EN LIGAS DE MOMS III-V Ricardo Pintanal,<br />
Vivilf Maria Silva Domes e Jose Roberto Leite (Institute <strong>de</strong> Ffsica <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> 540<br />
lrau l0)<br />
islu<strong>da</strong>mos o comportment° <strong>de</strong> impureMS <strong>de</strong> metals <strong>de</strong> transicho em lips <strong>de</strong> compostos III-V Me.<br />
funclio <strong>da</strong> composicho <strong>da</strong> liga. Estanos consi<strong>de</strong>rando inicialmente a liga <strong>de</strong> GaAsi. xPx e os contaminantes<br />
netilicos Cu, Fe e Mn . bastante comuns nestes materials. Utilizanos 0 mo<strong>de</strong>l° <strong>de</strong> aglomerado<br />
molecular <strong>de</strong>ntro do mdtodo <strong>de</strong> espalhanento mditiplo - As . (CdPq)
SEN/9:00/411.F IESTUOO OE HMIS PROFUNOOS EM GaAs CRESCI00 POP noup- Merclo A.A.<br />
rudonal o Americo S. Inhnta - IFFM-UNICARP.<br />
Usando Espentroscople do 1ronslonto <strong>de</strong> Nivel Pr ..... o IOUS). ontu<strong>da</strong>me anon-<br />
tras do GaAs t1Pos n o p. cronci<strong>da</strong> ■ par MOCVO no CPO do T.:Umbria a Vocuo-MOCVO no<br />
00-UNICARP. Ivosonto.<br />
Os rosultodos m a presence do nivel. proFundna prO:<strong>de</strong>os a anted, do<br />
band. prolbid. Alguns <strong>de</strong>stos nfvola po<strong>de</strong>msor 1dontifIcados cam ravels connect:Jos<br />
no litoraturo. tots calm o EL2 o a dovIdo a croon. Outrns tom orlpom dosconhoci<strong>da</strong>.<br />
(TelebrisJapesp.CMIN).<br />
SEN/9:20/AA F I--....077<br />
CONDIC CONTORNO CRISTALINOS NO CALCULO DE DEFEITOS EN SENIC0NDUTORES1<br />
APL1CAEA0 AO SELENETO DE EINCO. Paulo S. Guimaries. !CT/Institute <strong>de</strong> Pesquisa ■<br />
Especial. - !SPE. CP: 513 - 12201 - Sio Jose dos Campos, SF, Brasil: s Manool L. <strong>de</strong> Siqueira. dui<br />
versi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Minas Gerais - UPIIG, Belo Hari . MG, Brasil.<br />
CoudicOe ■ <strong>de</strong> contorno cristalinos foram <strong>de</strong> lvido ■ pars a obtancio <strong>da</strong> estruturo ■ letrO<br />
nica <strong>de</strong> &<strong>de</strong>ltas em ■emicondutores polo mitodo autoconsistents do espalhameuto multiple - Ea).<br />
Site oo<strong>de</strong>lo foi aplicado ao carol° <strong>de</strong> aiguns <strong>de</strong>feitos no magneto <strong>de</strong> mince.<br />
SEN/9:60/AR.F ESTRUTURA ELETRONICA DE IMFUREZAS DE METALS DE tuss[cAo 3d EM EnS. - Nino<br />
Chitchats. J.L.A.Alves a M.L. De Slq ' . Department* <strong>de</strong> P. , lax ,UFHC<br />
CP 702, Belo Horizonte, MG, Braun.<br />
Efetuamos cilculos auto -consistence. par. l <strong>de</strong> impurezas <strong>de</strong> metals<br />
<strong>de</strong> transigio 3d cm ERB@ mom o use do mitodo <strong>de</strong> espalhamento saltiplo. As impurerss introduzem of<br />
veil monoeletrOnicos <strong>de</strong> simetri ■ E e T2 na Eaixa prolbidn a raison:incise 000000 pon<strong>de</strong>ntes na loins<br />
<strong>de</strong> vaancis. O. niveis ds [size proibidn metres um comportamento monot5nien na seri'. quo icon<br />
sistente corm resultados experimentais "expurgados" <strong>de</strong> ereitos <strong>de</strong> multipleto (1) .<br />
(1) A. Fassio, M.J. Colds.. and A. &anger. Phys. Rev. B 30. 7430 (1984 )
SEM/10:15/4A.F "CARACTERISACAO 011 CENT= DO RECOMBINACAO PROFUNDOS EN CdSe POLL<br />
CR1STALIN0'. M.J.S.P. Brasil, F. Decker a Paulo Motisuke - IFGN - UNICAMP e<br />
J.R. Moro - CPO - Telebraa<br />
Estamos investigando filmes pollcristalino ■ <strong>de</strong> CdSe pare a fabricacio <strong>de</strong> colulas<br />
eolares fotoeletrogulmicas. Este trabelho consists basicamente na caracterixacio<br />
<strong>de</strong>stes filmes por espectroscopia <strong>de</strong> fotolumineecincia a fax parte <strong>de</strong> um programa<br />
<strong>de</strong> otimizacio <strong>da</strong>s cdlulas.<br />
No espectro <strong>de</strong> emissio infravermelha <strong>de</strong>stee amostras, observamos dues ban<strong>da</strong>p,com<br />
piece em A m - 1.20 um a Am - 0.95 um. Numa anilise doe resulted°, experimentais<br />
usando um mo<strong>de</strong>lo baseado em coor<strong>de</strong>na<strong>da</strong>s <strong>de</strong> configuracio, <strong>de</strong>terminamos os parimetros<br />
caracteristicos dos centres <strong>de</strong> recombinacio correspon<strong>de</strong>nt's. Propos°a tambim<br />
algumas explicacOes sabre sues origens.<br />
SEM/10 35/4A F<br />
T1TANIO INTERST1CIAL ON SILfCIO<br />
genegegturarjgarmas e gasign_filimmdcLgazhaus.<br />
Department° <strong>de</strong> Eletronica Quentica (Institute do Ffeica <strong>da</strong> UNICAMP).<br />
Buenos celculando Tlintersticial en Silicio.usando le* metodo tightbinding<br />
semi-empiric° e o mitodo do Fangio do Croon. Os elemontas <strong>da</strong> matrix<br />
<strong>de</strong> acopiamento do cristal pro on a impuresa.bon come as auto-energies dos,<br />
orbitals "d" do impureia sao calculados usando as paramotros do Harrison (4L<br />
Estancia conparando con cilculo s "ab initio" (ASO) meado fungio do Green nip<br />
auto-consistento.<br />
SEM/10:55/4A F I EFEITOs Di PRESSA0 UNIAXIAL RA ENERCIA Di imegin Di EWA= D EN C.:Sb s<br />
Ge:As. Gerald Weber a Luis Eduardo Oliveira, Inatituto <strong>de</strong> <strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong> Estmdual <strong>de</strong> Ciampi -<br />
nos.<br />
0 ciilculo <strong>de</strong> energis <strong>de</strong> ligsgio <strong>de</strong> estados 0- em a Cs:As sob prosaic: uniaxial l mo largo<br />
dm dirocio [111] a feito aaaaa a <strong>de</strong> um assume verisolomel na_apresimacio <strong>da</strong> mosso-of:nig:2 utill -<br />
send° use fungi:" envelope - pore os <strong>da</strong>is elitrons do estado 0 - do tipo proposto por<br />
Ehendresekher. Correcies do tipo vale-Orbits, interegio elitron-olitron a efeitom <strong>de</strong> pressio unisvial<br />
ale consid cam o seams tipo <strong>de</strong> formalism° utilisado resentments 2 no cum do Bi:P s<br />
Si:As sob p aaaa a uniesisl na diregio BOO].<br />
ReferCnclae:<br />
1. N. Taniguchi a S. Narita, J. Phys. Sac. Jap. 43, 1262 (1977).<br />
2. L.E. Oliveirs e L.N. Falicov, Phys. Rev. 633, 6990 (1986).
SEN/11:15/4A.FICARAcTERIEACAO DE GaAs IMPLANTADA CON No - Fernando likaws. Paulo<br />
Motisuke, Francisco Prince - UNICAMP 0 Israel Saumvol - UFRS<br />
Substrata. <strong>de</strong> GaAs tipo n com dopagem residual <strong>de</strong> - 10 16 cm -3 foam. implantado ■<br />
com ions <strong>de</strong> Na+ a - 100 Rev. Isto resultou numa distribuicio <strong>de</strong> dopagem com pico<br />
a - 200 A <strong>de</strong> profundi<strong>da</strong><strong>de</strong> e concentracio midis . 10 18cm-3 . Aativaciodos ions foram<br />
feitos por tratamento titmice) a 050 °C por 30 minutoa numa ampola fecha<strong>da</strong> contondo<br />
uma atmosfora <strong>de</strong> Au. Apreeentaremos resultadoa <strong>de</strong> caracterizacio <strong>de</strong>stas<br />
amostras utilizando tacnica <strong>de</strong> fotoluminescancia a baixa temperatura.<br />
5EN/11:35/4a.F ESTUDO OE CANADA3 EPITAXIAIS DE GaAlAs:Sn POR NEDIDAS DE FOTOLUMI<br />
NESCENCIA. ii.Romsoro Nontesinos, J.P. von 4,r Waid (Departamento <strong>de</strong> Ftsica-PUC-11.7)<br />
Mario T. Furtado (C140-TELEBRaS).<br />
Sera° apresenta<strong>da</strong>s medi<strong>da</strong>s <strong>de</strong> fotolumineacincia na faixa <strong>de</strong> temeeraturas entre<br />
63.3K e 300K em cama<strong>da</strong>s apitaxlais dm Ga1_01 xAssSn. as quaffs sao usa<strong>da</strong>s coma<br />
cama<strong>da</strong>s passives em lasers <strong>de</strong> hateroestruturs dupla. A baixa temperatura (Pto.<br />
triplo NO na recta° proximo ao gap foram observa<strong>da</strong>s tres ban<strong>da</strong>s: a transicio<br />
ban<strong>da</strong>-ban<strong>da</strong>, a recombinacio rediativa <strong>de</strong>vido a presence <strong>de</strong> impurezas residuals<br />
associa<strong>da</strong> a transicio ban<strong>da</strong> <strong>de</strong> conducio-aceitador rano, i<strong>de</strong>ntifIca<strong>da</strong> coma impureza<br />
residual carbono e uma transicao envolvendo um complex° <strong>de</strong> natureza nio i<strong>de</strong>ntifica<strong>da</strong><br />
net literatura consulta<strong>da</strong>. Na regLao <strong>de</strong> balsa energia observa-se a rsemissio<br />
provenlente do eubatrato a uma bands larga em 1.510V associa<strong>da</strong> a impuresa<br />
<strong>de</strong> Sn. Variando a temperature a posalvel calcular a energia <strong>de</strong> activacio <strong>de</strong><br />
alguns dos centros radiativos e a resolucio <strong>de</strong> duos ban<strong>da</strong>s a T. ambiente consegue-se<br />
palm carioca° <strong>da</strong> intensi<strong>da</strong><strong>de</strong> <strong>de</strong> excitacio.<br />
5EM /11:55/AA.FI PSOPRIEDADES dPTICAS DOS SENICONDUTORES SEM1NACNETICOS.<br />
Mauro R.Sar<strong>de</strong>l ■ Jr a A<strong>da</strong>lberto Maio<br />
Institute <strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sao Paulo.<br />
A origem <strong>da</strong> aboorcio em cerca <strong>de</strong> 2.1 eV no material ■ emicondutor seminagniticoCd<br />
l-s Mn r Ti tem lido objeto <strong>de</strong> d'<br />
.<br />
Embors a Leonia <strong>de</strong> Tanabe-Sugano<br />
:presents dilicul<strong>da</strong><strong>de</strong>a para ova interpr aaaa io como sendo uma transicio intrs - d<br />
6 A 1 . 4 1' ■ splicacio do metodo <strong>de</strong> multipleto ■ (Fszsio rt ■ 1, 1986), calculando ■<br />
energia <strong>de</strong>st ■ transicio em torsos dos p aa aa tros ds <strong>de</strong>formacio orbital A e A t ,<br />
do "splitting' d off do cempo cristalino e dos parimetros <strong>de</strong> Recall amicom, propi-<br />
cia um estudo d ■ canal i ■ <strong>de</strong>nts hipatese 0 calculo <strong>da</strong> varincio, cos a p<br />
hidromtitica, dm energia assim obtidm„ recal na anilise dm <strong>de</strong>pendinci ■ <strong>de</strong> l e A t<br />
e A elf tambem com a p - o.
e01/8:00/5A.F I ESTAODS ELETROMICOs NA ConFrOunAcA0 OE CAMPOS CROZMOS-IF.x13).<br />
ygniR A. CHIIIA, ABRAHAM M. COVEN-(lnatituto <strong>de</strong> <strong>Fisica</strong> Ouleice <strong>de</strong> Sep Carlos-OSP) ■ MOM E.<br />
MARQUES-(Univerai<strong>da</strong>ds Fe<strong>de</strong>ral <strong>de</strong> Bic Carlos).<br />
A sonFigursgeo ds clown crusa<strong>de</strong>s o fun<strong>da</strong>mental pare o 'etu<strong>de</strong> do propris<strong>da</strong>dno ds transports es asmiconduterea<br />
a 001.1 oolhor example ds anemia i 0 sfsito 14011 quentizedo. Recants epitomises an<br />
MOSFB14(11 a em Quantum hollm(2) <strong>de</strong>manatraram ■ revelerao altusgeine fiascos <strong>de</strong> gran<strong>de</strong> intoning.<br />
Alpines caractarlaticas do movimonto <strong>de</strong> portedorsa in poem coantieos cm' configureceo <strong>de</strong> camas<br />
crusa<strong>de</strong>s aerie astu<strong>da</strong><strong>da</strong>s usando o metodo k.p. Aspeetos <strong>da</strong> geometria.emplamento e <strong>da</strong>generasmenele<br />
ne astruture eletrenlea eerie timeim abor<strong>da</strong>doo.<br />
(1) W.Zewadikl.S.Klahm and U.Morkt.Pnys.Rev.11.33.65I5IHNIBI<br />
121 Oill.O.Olivelre.v.M.S.Games and J.R.Leite.Phys.Rv.B.( to be published).<br />
SEN/8220/ 5A - F 1ELECTRON-PHONON INTERACTION EFFECTS IN A QUASI-TWO-DIMENSIONAL 7 -<br />
TRON GAS IN GoAs-Ga. _AI,As HETEROSTRUCTURE. Marcos H. Domini and Oscar Hipalito<br />
(Institute do Fisici -01 Wimica <strong>de</strong> Sio Carlos. U5F).<br />
From a single electron theory it is well established that the polaron effe<br />
tive mass in purely two-dimensional systems is larger than the corresponding three<br />
dimensional case. On the other hand, recent cyclotron resonance experiments have<br />
shown that the polaronic mass in two-dimensional GaAs heterostructure is a factor<br />
of 3 smaller than the three dimensional results. In or<strong>de</strong>r to un<strong>de</strong>rstand the die -<br />
crepancy between the experiments and this simple theory we have improved the mo<strong>de</strong>l<br />
by taking into account the electron interaction with both interface and longitudi-<br />
nal bulk phonons. We have also inclu<strong>de</strong>d in the calculation the effects of the elec<br />
tron screening within the randon-phase-approximation formalism and the electron maband<br />
wave function. In contrast to previous works we have shown that the interfac<br />
phonons give significative contribution to the polaronic energy and effective mas<br />
and obviously can not be neglected. The results of our Calculations for the pole<br />
ron mass correction are in excellent agreement with the experiment measurements.<br />
SEM/B:A0/5A.F 1MANY-BODY PROBLEM IN QUANTUM MIRES IN GaAs-GaAlAs. Vera B. Campos<br />
Luniversi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Sio Carlos). Marcos H. Dermal and Oscar Hipolito (Institu<br />
to <strong>de</strong> Fisic ■ a Quimica <strong>de</strong> Sio Carlos, USP).<br />
The ground-state properties of a quasi-one-dimensional electron gas_ in<br />
quantum wires in GaAs-GaAlAs are investigated on the basis of a theory where the<br />
short-range correlations are present through a local-field correction. This approach<br />
can be seen as one of the most successful) improvements of the Randon Phase Appro<br />
xlmstion (RPA). We present results for the pair correlation functions, exchanges<br />
and correlation energies as well as for the plasma dispersion relation in compa -<br />
risonto the RPA values.
SEM/09;00/5AS I EXCITON BINDING ENERGY IN QUANTUM WELL WIRES. Marcos II. Degani and<br />
uscar iitpultto tinstituto <strong>de</strong> <strong>Fisica</strong> e 'Nimes <strong>de</strong> Sao Carlos. USP).<br />
The binding energies of excitons in quantum well wires of GaAs surroun<strong>de</strong>d<br />
by Ga,..Al vAs are calculated with the use of variational solutions to the effecti-<br />
ve-male-eqOation. The results we obtained show that the energies are dramatically<br />
<strong>de</strong>pen<strong>de</strong>nt of the sizes of the wire. and also that its magnitu<strong>de</strong> is greater than<br />
in comparable quasi-two-dimensional quantum well structures.<br />
SEM/09:20/511.F 17:1;;;-B DE INTERFACES METAL-SENICONOUTOR - J.C.Gelzarani, 3.0.Fret<br />
re. C.Constentino. C.A.Oliviari (D.F.-UFSCsrI, J.B.B.Olivaira a F.C. do Prince<br />
(IFGW - Unleespl.<br />
Estee°s eepenhados no verifiescio <strong>de</strong>s proprie<strong>de</strong><strong>de</strong> ■ <strong>de</strong>s interfaces entre Metals<br />
(s lies ■ matinees) s semleondutors. compost°s do grupo III-V (Sags. InP.<br />
GaSb). 0 earitsr ratificador ou inmieo pars diverse' pares motal-semleondutor esti<br />
son<strong>de</strong> investigado. Escudos sio rectitu<strong>de</strong>. sabre as 00000 !e<strong>da</strong>m,. d ■ febrieacie<br />
Instalitagio. 'alloying'. difusio ou implant* do docents.. limpsza dos substratoW<br />
quo influent nes proprie<strong>de</strong>dse dos diapositives.<br />
A earecterizegio elitrieeifulteepartir <strong>de</strong> modifies <strong>de</strong>txlisCulf. Pere<br />
oe 00000 toe ihmleos. setae°s anon o tienteas pore obteneio do resistineie especiflea<br />
do conceit° R . Anilines sabre reprodutibili<strong>de</strong><strong>de</strong> s <strong>de</strong>gro<strong>da</strong>gio setae son-<br />
<strong>de</strong> iniela<strong>de</strong>s.<br />
afore°. natio san<strong>de</strong> <strong>de</strong>senvolvidos pore obtsnyie do Informs-<br />
cie ■ sabre a ■struture <strong>de</strong> Interface. per Rutherford Beckscattering (IF-UFRGS1 e<br />
aspect is Auger (COPPEI.<br />
SEN/09:40/5A.F<br />
EXCITONS TRAPPED IN IMPURITIES: THE BOUNDED-UNBOUNDED PHASE TRAN-<br />
SITION- J.E.M. Hornos. M. Degani and Oscar Hipalito - IFQSC/USP<br />
Excitons can be trapped to impurities in some semiconductors. Assuming that the<br />
effective mass approximation is valid the three-body problem can be solved using<br />
hypersphericol coordinates with good accuracy using the simplest adiabatic<br />
approximation. The relation between the hole and electron mass play a fun<strong>da</strong>mental<br />
role in the obtention of the ground state energy. IF the mass relation is<br />
above a threshold value the system is boun<strong>de</strong>d and the mean radius is finite. In<br />
the other case there is no bound state. This phase transition is investigated<br />
and the critical exponent E-E, ■ (is-m,) 1 is calculated. We also compare the<br />
wave function in the two diffErent phBses.
5E11/10:15/AAA ESTRUTURA ELETRONICA DE SUPER-REDES. Armando Corbani Ferris (inStituto <strong>de</strong><br />
<strong>Fisica</strong> <strong>da</strong> USP)<br />
Estudos tedr1cos <strong>da</strong>s super-re<strong>de</strong>s (GaAs) n(AlAs) n. MISelm(GaAs) n e (InAs) m(GaSb). <strong>de</strong>ntro<br />
do esquema <strong>de</strong> <strong>de</strong>nsi<strong>da</strong><strong>de</strong> fiscal atravds do metodo pSeudopotencia1. Aspectos reTerenta a estrutura<br />
ultrafIna (nomem1) enfatizam o fate <strong>de</strong> se distingulr as estruturas <strong>de</strong> ligas or<strong>de</strong>na<strong>da</strong>s do<br />
tipo At;Gal.xAs e in aGal.,As .<br />
Um/10135;7n ESPALHAKENTO DO 2060 POO FONONS BO POWS QUANTICOS SUOMETIDOS A CAMPOS NAGOlt-<br />
T1003 FORTES. C.B.S. Leal, 1.C. dm Cunha Lime. NCT/Instituto dm Pesquisa ■ Bs<br />
pe<strong>da</strong>ls, CP: 515, 12201 - Sie Josinros.T#1=11.oper,COPq/Ciontro Braille's° <strong>de</strong> Paqui<br />
sas F Rio <strong>de</strong> Janeiro, RJ.<br />
Lau<strong>da</strong>-se o espalbamento dm litruma mum:to ban<strong>de</strong>d <strong>de</strong> Lmm<strong>da</strong>u (larger. <strong>de</strong> bands<br />
eausa<strong>de</strong> per impureses) per lemmas suprfieisis on interfere <strong>de</strong> posse quimtices. biecece-se a via<br />
biii<strong>da</strong><strong>de</strong> <strong>de</strong>ns interagie mm fumeie <strong>de</strong> mrqulttura do pmts. As rmaiarivi<strong>da</strong><strong>de</strong>s Pa a ow aim ebti-<br />
<strong>da</strong>s a pectic <strong>da</strong>d equagies <strong>de</strong> Rube utilieamdm-se o formations <strong>de</strong> [untie mmmaria.<br />
SEM/10:55/5A.F DIFUSA0 DR AD-ATOMOS RN INTIRFAC15. 1.C. dm Cunha Lin., RCT/Institeto <strong>de</strong> Peequimme<br />
Esnarimie. mew 515. 12201, SJCsepos. SP; A. Tre r. CNN/Castro Srasiteiro <strong>de</strong> Pseek<br />
ems Flukes. Rio <strong>de</strong> Janeiro. KJ ■ 5. C. !riot, Department o yaks, Brous University, USA.<br />
A difusio du ad-itemoo em use superffeie d estu<strong>da</strong><strong>da</strong> <strong>de</strong>an:la-se um modulo <strong>de</strong> pequamm vs-<br />
toren (Small Polarom Na<strong>de</strong>l). Utilise-se o formalisms <strong>de</strong> fund:, memdri ■ pars o eiteulo do enfl-<br />
ames <strong>de</strong> difusio <strong>de</strong> acordo cam a Cumuli dm Rube. Nostra-se quo. usando-se umm 'tweak° corms<br />
Meet. pars a funcio <strong>de</strong> correlerio torrents-corrente, obtem-se taste o terms eodheeido eemo difu<br />
sae 'Doc "hopping" quanta ao meesntmmm dm eondueie pot bands, a <strong>de</strong>pendsr do t to <strong>de</strong> tempers-<br />
tura eonst<strong>de</strong>rado.
SEm/11:15/5A.F POLAAOHS EM FILMES OE SEMICONOUTORES POLARIS. 6.A.Farias , N.H.<br />
Degani * e 0.Hipolito*fr.,. - Departamento <strong>de</strong> <strong>Fisica</strong>-UFC-Fortaleze-<br />
Ceara - 60.000 Oepartamento <strong>de</strong> <strong>Fisica</strong> a Ciencias dos <strong>Materia</strong>ls-USP-Sio Carlos-<br />
SP. 13.560.<br />
Consi<strong>de</strong>rando um films <strong>de</strong> um semicondutor polar, <strong>de</strong>positado sobre um '<br />
substrate, calculamos a energia do estado fun<strong>da</strong>mental <strong>de</strong> um polaron confined° '<br />
neste filme. Na interecio eletron-fonon consi<strong>de</strong>ramos que o elitron interage com<br />
os mo<strong>de</strong>s <strong>de</strong> volume (LO) a <strong>de</strong> superricie (SO). A energia do polaron a calcula<strong>da</strong> '<br />
pare 'Arias tipos <strong>de</strong> semicondutores, come fungi° <strong>da</strong> espessura do filme.<br />
SEM/11:35/5A.F STATISTICAL PROPERTIES POLARONS IN QUASI-ONE-DIMENSIONAL SEMICON ■<br />
UULIUKS biKULI RES. Marcos H. Deaank and Oscar Hipolito (Institute <strong>de</strong> <strong>Fisica</strong> e<br />
Quimica <strong>de</strong> Silo Carlos.<br />
In a semiconductor heterostructure which confines electrons to one dimensional<br />
the characteristies of the scattering mechanisms are significantly modified<br />
leading to an enhancement in the mobility. In this work, we discuss the interac -<br />
tion of the one-dimensionally confined electrons with polar-optical phonons at fi<br />
nits temperature, in quantum well wires of GaAs-GnAlAs. By using Feynman's path-<br />
-Integral formalism we have calculated the free energy, self energy, effective moss.<br />
entropy and specific heat of the polaron as a function of tempereture.and the sites<br />
of the wire.<br />
cvm/11:55/5A.F<br />
CARATERIERCAD DE CAMAS DE EnDeAsP POR ESPECTROSCOPIA DE mopuLKAo<br />
Josh Luis Herrera Perez - Navin B. Patel<br />
Institute <strong>de</strong> <strong>Fisica</strong> 'Glob Eataghin ONICAMP<br />
13081 Campinas OP Brasil<br />
Usendo fotorreflitancia a temperature emblente estudou - se lines quaternaries<br />
<strong>de</strong> in, Ga As,_ Py erenci<strong>da</strong>s per epitaain em fame liquids. pare <strong>de</strong>ter<br />
miner o valot _ Dregis6 go gap 1EJ e 0 parametro <strong>de</strong> alargamento Cr) dos espec<br />
troe obtido ■ e que parece ter 1Tgacao mom o casement° do parametro <strong>de</strong> redo.<br />
A forma <strong>de</strong> linha dos espectros foram ajustados a forma funclonal <strong>da</strong> ter<br />
ceira <strong>de</strong>rEva<strong>da</strong>.<br />
Discute-se os resultados em fungi° <strong>de</strong>s condigois <strong>de</strong> creacimonto, <strong>da</strong> com<br />
posicao <strong>de</strong>s ligas e o caaamento do parimetro <strong>de</strong> redo.<br />
4
5EN/6:00/6A.F RFEITOS DOS TRATAMENTOS TARMICOS SOUS AS PROPRIEDADES APTICAS DE<br />
a-SiN se :H. J.I. Cisneros. J.H. Dias do Silva, M.P. Can a°. F.C. Marques. institute<br />
<strong>de</strong> <strong>Fisica</strong> Unicamp - CP 6165 - 13061 Campioas, SC. la A. Nomadism Lahormtoirie<br />
<strong>de</strong> SpeCtroscopie II. CHU. Universiti <strong>de</strong>s Set<br />
Place &oe Sataillon, 34060 Mostpallier. Prance.<br />
As proprie<strong>da</strong><strong>de</strong>s Opticaa <strong>de</strong> oitreto <strong>de</strong> silicio<br />
t Techniques du Languedoc.<br />
bidroaenado. <strong>de</strong>posited'<br />
polo mikado <strong>de</strong> Sputtering RF, foram dotrmina<strong>da</strong> ■ am niseie dm temperator ■ <strong>de</strong> medi-<br />
c:a apis aaaaa mentos tirmicos a virile, temperatures. 0 Indica <strong>de</strong> rEragio a<br />
cosficiente <strong>de</strong> absorelio forum calculados a weir <strong>de</strong> @spectraa <strong>de</strong> traosmissIo ■ TO<br />
(Lazio. Foram ob dos afeitos tirmicos recessive's i Teats mos valorem<br />
do imp Sptixo Es e do indica <strong>de</strong> refracio litic° o p .<br />
Variscias correlacioroa<strong>da</strong>s dm El o o . Redid°, a die spar aaaaa a. tam*<br />
him loran obaerva<strong>da</strong>m. Dalai results um <strong>de</strong>er:seiner aproxima<strong>da</strong>msote linear <strong>de</strong> o s ■<br />
Euneio <strong>de</strong> E.<br />
SEM/0:20/6A.F LASER OE SEMICONOUTOR COM PERFIL OE GANNO INVERTIDO E 'JUNCAO<br />
TRANSVERSAL. J.F.T.Gislia. M.M.G. dm Carvalho. F.C. ds Prince. N.O.Patal-Unicamp<br />
-IFOW/LPO.<br />
0 laser c aaaaa clonal [cantata <strong>de</strong> falcal dm ssmicondutor nio ap to um<br />
bom confinamento chic° no piano dm jungio. Dente as appiss axe se spresentam Re<br />
rs sel aaaaa sets confinaxentol a jungie transv ersal. qua confine 6tIcamnt<br />
fele ■ luminoso 00000 ura dm ums camadm epitomic) lc lust). o laser <strong>de</strong> well<br />
dm who !rival-tido QUO Os utilize dm umm Inlegia lateral. sio doe mats aremissoras<br />
Pars fabricagio <strong>de</strong>stas dispositivos. i - io um bom conhacimanto do<br />
ticnica dm ellFuseo dm isd 00000 an sand tom bum corn ■ a dominio <strong>de</strong>l tau:mica<br />
d crescimanto seitomle1 Nettie. ea Foss liquids ILPEl.<br />
Pr 00000 rooms mostrar as passel' qus ■sti° ■sndo saauldos no fabricamio oti<br />
mizagio dust's tipos <strong>de</strong> diadositivos.<br />
IFINANCIAMENTO TELEBRAS1<br />
5EN/B:40/6A.r<br />
NEDIDA CE DESCONTINUIDADE NA BANDA DE COSMIC CON RELArA0 A VA-<br />
RIAGAD DA BANDA PROIBIDA EM HETEBDJUNCOES n-n DE GaAlAa - Mario T.Purtado, Maria<br />
Salute S. Loural, Antonio C.Sache - CMD-TELEBRAS.<br />
0 perfil <strong>da</strong> concentragio <strong>de</strong> portadores em ums beterolungio IBM n-n !armee° uma<br />
medi<strong>da</strong> direta <strong>da</strong> <strong>de</strong>scontinui<strong>da</strong><strong>de</strong> na bands <strong>de</strong> =a<strong>da</strong>gio (Allefill. Publicagaes recen<br />
tee reportam o valor 8ec/6139 1 0,6 1613g s diferenga dos ban<strong>da</strong>s proibi<strong>da</strong>s <strong>de</strong> co<strong>da</strong><br />
lado <strong>da</strong> NJ) pare HJs tipo GaAseGm,_.A1.A. pare qualquer valor <strong>de</strong> Neste traba-<br />
lho realizamos *seas medi<strong>da</strong>s em 113s-n-N do tipo Gan Al onAsselan KaA1n n ,As pot<br />
C-V eletrogulmico, gum apresenta a vantagem, em read§ 60 C -V oo66116ciondI L <strong>de</strong><br />
nos permitir etingir profundi<strong>da</strong><strong>de</strong>s meioses, longs <strong>da</strong> NJ, sem alterar a tensao<br />
aplica<strong>da</strong>. As asostras analisa<strong>da</strong>s foram cresci<strong>da</strong>s pox opitagia a partir <strong>da</strong> lase 11<br />
qui<strong>da</strong>. A ooncentragip <strong>de</strong> megtadores 6 <strong>da</strong> or<strong>de</strong>m <strong>de</strong> 10 na cama<strong>da</strong> <strong>de</strong> bands<br />
pre:111214a manor e 10 —ou 10'Fcm" na <strong>de</strong> ban<strong>da</strong> prolbi<strong>da</strong> major. As energias doe bandies<br />
proibl<strong>da</strong>s foram medicine or fotoluminesconcia. Os resultados <strong>de</strong> AEc/AEg estio<br />
entre 0,5 e 0,54eV, muito proximos dos valorem mats recentes publicados pare<br />
GaAseGaAlAs. Lima estimativa do <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> cargos interfacial tamblem fat felts.<br />
1- H. !Crosser, H. Y. Chien, J. S. Harris Jr. , D. D. Edvall - App 1. Phys. Lett.<br />
36. 295 11980).
SEM/9:00/6A.F I "CARACTERIZACAO DE FILMES DE GaAs CRESCIDOS POR MOCVD. EN VACUO".<br />
Avrton Andre Bernussi e Paulo Motisuke - IFGW - UNICAMP<br />
Foram caracterizados, atraves <strong>de</strong> fotoluminescencia a baixa temper/4%1ra, filmes<br />
<strong>de</strong> GaAs nio dopados creacidos por MOCVD em vicuo. Estes .mantras foram cresci<strong>da</strong>s<br />
I diferentes temperatures do substrata e razoes <strong>de</strong> fluxo As/Ga (ou razio V/IIIl.<br />
Os resultados obtidos <strong>de</strong>mo que o carbon° e o aceitador residual predominan-<br />
te. A resaucio <strong>de</strong>s diverges linhas <strong>de</strong> exciton ligado, indica uma baixa concentra<br />
c50 <strong>de</strong> impuresan reniduain 1- 10 15 eft-3 ). R npre.nenladn tamh6m nfta cur. -einem en-<br />
tre as condiroee <strong>de</strong> crescimento a as i i<strong>da</strong><strong>de</strong>s <strong>de</strong> fotoluminesancia.<br />
sEm/9:20/6A.F I DESENVOLVIMENTO DE LASERS SEMICONDUTORES DE GaAs PARA COMUNICACOE<br />
OPTICAS. - A.C.Sachs, C.A.Loural, R.G.Pereira, J.S.Pereira. R.Amaral. N.Patel,<br />
A.C. Bor<strong>de</strong>aux Reqp - CPqD-TELEBRAS - Campinas-SP.<br />
Neste trabalho 6 apresentado o <strong>de</strong>senvOlvimento <strong>de</strong> laser <strong>de</strong> GaAlAs/GaAs pars<br />
aplicagio em ComunlcagOes Opticas. Estruturae <strong>de</strong> lasers <strong>de</strong> guiamento por ganho,<br />
do tipo cantata <strong>de</strong> faixa em SiO2 a estrutura <strong>de</strong> canal em 'V", foram <strong>de</strong>senvolvi<strong>da</strong>s<br />
objetivando eliminar tangoes meanie!s causadores <strong>de</strong> <strong>de</strong>feitos que provocam a <strong>de</strong> -<br />
gra<strong>da</strong>cao do laser. Os diapositives sao fabricadoe utillzando-se tecnica <strong>de</strong> crescl<br />
mento epitaxial <strong>de</strong> Ease liquids. <strong>de</strong>poeigio <strong>de</strong> diel6trico por sputtering. formacia<br />
<strong>de</strong> canal no semlcondutor por fotolitografia, e difusao. Depen<strong>de</strong>ndo <strong>da</strong> largura <strong>da</strong><br />
faixa <strong>de</strong> confinement° <strong>de</strong> corrente, os lasers operam no modo fun<strong>da</strong>mental, eliminan<br />
do Lestabili<strong>da</strong><strong>de</strong>s nag sues caracterlsticas eletro-opticas (kink, auto-pulsagio).<br />
mantendo-se a oorrente limier na faixa <strong>de</strong> 60 a 100mA.<br />
Estudos_<strong>de</strong> <strong>de</strong>gra<strong>da</strong>gio acelera<strong>da</strong> nos lasers mostram que, com mitodos a<strong>de</strong>qua-<br />
dos <strong>de</strong> selegao, obt6m-se dispositivoe com tempo <strong>de</strong> vi<strong>de</strong> major qua 100.000 hares,<br />
emitindo 3mW na temperature ambient°.<br />
Este tecnologia 6 objeto <strong>de</strong> transfeancia para indfistria <strong>Nacional</strong> <strong>de</strong> Semicon<br />
dutores.<br />
SEM/9:110/6A.F "ESTU00 OAS TRANSICOES ORDER-DESORDEN 211 LIGAS SE711CONDIJT0RAS ATRAVES DO<br />
CALMS DE ENEMAS =AU". Banta Spitler. (RCM), Mark Robbins, (Johns Hopkins U.), Roberto<br />
Osario, (UO). Maris A. pavidov1ch, (PUC/RJ)<br />
Allgums iiRav ammicondutorse (11I-V)1. K (1V)2 1, ■pressum ums tronaigio sinc-blends-- diaman<br />
to UMAI qio critic. Kc=0.3 . Rae aaaaa igio dove-se provarelmente a efeitos <strong>de</strong> tor<br />
relegio entre as empecies atZmicas que infloonciam o process* <strong>de</strong> 11101C0 epitasisl na di<br />
recto (100). Liass do tipo (II1)05 (111')5 V Kimball exibem use tranalvio na qua' os atoms:<br />
<strong>de</strong>s aspect's 111 se ordinals na estrutura t sons' simple ■ (tipo CuAu-1 na sub-redo catianies).<br />
sendo este ttttt igio <strong>de</strong> origem Lermodinimica . poi ■ in<strong>de</strong>pen<strong>de</strong> d ■ direceo <strong>de</strong> crescimen<br />
to epitasia1. Estsmos calculando ■ as energies' total s <strong>de</strong> formagio ■ fim <strong>de</strong> <strong>de</strong>terminer dlagra<br />
ma <strong>de</strong> fame <strong>de</strong>ems sista.... No camp <strong>da</strong> icio termodinimics. entrup1s courigurecional<br />
calculs<strong>da</strong> ma eproximacio <strong>de</strong> Kikuchi.
SEH/10:15/6A.FI MAGNETIC PROPERTIES OF THE IMPURITY SAND. Sergio S. Nakler, Ns-<br />
Oa Franca Ferioli and Enrique V. Ands (Institute <strong>de</strong> <strong>Fisica</strong> - Universi<strong>da</strong><strong>de</strong> Fon=<br />
ral Fluminense).<br />
A simple mo<strong>de</strong>l is <strong>de</strong>veloped to study the magnetic properties of impurities<br />
in doped semiconductors at intermediate concentrations. The exchange interaction<br />
between hydrogen-like atoms is antiferromagnatic for all distances. As a<br />
consequence of the frustration introduced by disor<strong>de</strong>r, for low concentrations and<br />
low temperatures the material is believed to be a spin glass.<br />
The system Is <strong>de</strong>scribed by a Hubbard Hamiltonian in which the interaction is<br />
treated in the unrestricted Hartree-Fock approximation (UHF). The disor<strong>de</strong>r is<br />
approximated by supposing that the overage number Of neighbours is large.<br />
At zero temperature the material goes through several transitions when<br />
doping increases. For low concentrations it has ■ spin glass Insulator phase,<br />
then It suffers a transition to spin glass "metallic" phase and after that to<br />
non-magnetic "metallic" one. Finally the material becomes a true conductor when<br />
the Fermi level crosses the mobility edge. Thls last transition Is not <strong>de</strong>scribed<br />
in our mo<strong>de</strong>l because we did not study localization.<br />
Densities or slate.. specific heat and magnetic susceptibility for several<br />
Concentrations are presented.<br />
SEM/10:35f6A.f PPE DE CADOLINTum EM SILICIO aliOefo a . J. II. Castilho ■ F. C. Marquee,<br />
F. Alvarez C. E. Rarberis, 1. Chamboulepron a C. Rettori.<br />
(Instituto <strong>de</strong> Fteica. Universi<strong>da</strong><strong>de</strong> Estadual <strong>de</strong> Campine. - UNICAHP)<br />
verifieou-se a prioeir ■ obaervacio per 11BI <strong>de</strong> Cd em amostras foram prepa-<br />
ra<strong>da</strong>s polo mated° <strong>de</strong> ea-sputtering as forma <strong>de</strong> film ■ floos(200x10 -3 mm 3 ).A. eoncentral<br />
-6es nominal. <strong>de</strong> Gd (Ccd2) foram satima<strong>da</strong>s poles rasa. ■ antra as irass dos<br />
elves Cd/Si e as taxes Individuals <strong>de</strong> "apu ' g" correepon<strong>de</strong>ntes.0a experimentos<br />
<strong>de</strong> ESR em Ban<strong>da</strong>-I a temperature ambient. meatier.= qua pare balsa. concentracies<br />
<strong>de</strong> Cd (0.03Z
SEM/11:15/41LJSCREENEU IMPURITY BOUND STATUS IN Si NOS STRUCTURES. Marcelo Z.<br />
:nI7117(artos M. Deguni and Oscar ilipalito (Enstituto dc <strong>Fisica</strong> e fluimica <strong>de</strong> S.<br />
canai; USkr.<br />
The binding energy of a charged impurity center located insi<strong>de</strong> the oxi<strong>de</strong><br />
and at the interface of s n-type Si inversion layer is calculated through the variational<br />
solutions to the effective mass equation. The screening of the impurity<br />
by the electrons is taken into account In the Randon Phase Approximation (RPA).The<br />
calculation is performed by assuming that the first two electrical suhbands are<br />
occupied. The results obtained are compared to the experimental <strong>da</strong>ta recently<br />
appeared in the literature.<br />
SEN/11:35/6A.F I EFEITOS DE DISTORCAO B RELAXACAO NA ENTROPIA DE MARACA° DA<br />
VACANCIA DE SILICIO. Euzi Conceigio F. Silva. Arnaldo Dal Pine Jr.! a J.R.Leite<br />
.1nstituto <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Sio Paulo)<br />
Estu<strong>da</strong>mos o efelto <strong>da</strong> vacincia isola<strong>da</strong> sabre a dinimica d ■ ro<strong>de</strong><br />
em silicio. Para tante. realizamos 3 distintas abor<strong>da</strong>8ens d ■ vacincia. Inicialmente<br />
. <strong>de</strong>sprezamos os efeitos <strong>de</strong> Intern:0 <strong>de</strong>s ligagoes flutuantes sendo o <strong>de</strong>feito<br />
tratado em simetria tetraidrica. Num segundo estigio . consi<strong>de</strong>ramos a relaxagio<br />
simetrica <strong>da</strong> re<strong>de</strong> na regiio do <strong>de</strong>feito. Finalmente. incluimos ■ intersgio<br />
entre os orbitals flutuantes distorcendo o sistema pare simetria tetragonal.<br />
Notamos quo tanto o efeito do relexagio quanto o efelto <strong>da</strong> distorgio<br />
po<strong>de</strong>m atuar no sentido <strong>de</strong> glover a entropia <strong>de</strong> formi2g5o <strong>de</strong> vacincia (SO.<br />
As consequencias <strong>da</strong> elevagio <strong>de</strong> Sr e a participagio d ■ vacincia no mecanismo<br />
<strong>de</strong> sutodifusio sio discuti<strong>da</strong>s.<br />
Trabalho parcialmente financiado par: FAPESP a FINEP.<br />
Departamento <strong>de</strong> <strong>Fisica</strong> do Institute Tecnolagico <strong>da</strong> Aeroniutica.<br />
SEM/1155:/6A.F I SUPERFICIE OE SEHICONDUTORES. Armando Eorbanl Ferret (InstItuto <strong>de</strong> <strong>Fisica</strong> do<br />
<strong>da</strong> USP)<br />
Estudo <strong>da</strong> estrutura eletr6nica <strong>da</strong> superfIcle <strong>de</strong> semlcondutores dos grupos 111-V e 11-VI uti<br />
Ilzando os mdtodos <strong>de</strong> energia total e forga <strong>de</strong> Hellman-Feyaman. Proprle<strong>da</strong><strong>de</strong>s na adsorcao di<br />
metals em superfkles <strong>de</strong> semlcondutores.
SEN/PAINEL i CARACTERIZACAO DE CANADAS EPITAXIAIS DE SENICONDUTORES. Alba Rosa<br />
Lopez.rara<strong>da</strong> a Jos Carlos Valladio <strong>de</strong> Mottos (LPD - 1FGY - Uniting).<br />
Usando d efelto fotocustico-foto tirmiko E possivel medlr a espessura <strong>de</strong> cm-<br />
mo<strong>de</strong>s epitaxials <strong>de</strong> semicondutores, cos a cantagem <strong>de</strong> No as tratar <strong>de</strong> um mitodo<br />
<strong>de</strong>strufivo. po<strong>de</strong>ndo asslm, utilizer a mesa amostra perm a sua caracterlzaciools .<br />
tu<strong>da</strong>ndo- se proprle<strong>da</strong><strong>de</strong>s termicas a ou optic's <strong>de</strong> co<strong>da</strong> cama<strong>da</strong> msando a espactroco<br />
pia fotocustica - fototirmica.<br />
SEN/P111NEL manLISI DA IONICIDADS 1108 CONPOSTOS [I-b I VI-a. Antonio Sere° C. Esperidlis<br />
(UFBA/UN1CAM) e Jon; Cedric P. Remo. (Institute <strong>de</strong> Plaice. UNICANP).<br />
Neste trabalho explormmos a loniel<strong>da</strong><strong>de</strong> doe eompostos lib-Vie, qua &presentee estrutorm<br />
"ZINC-BLEND" Zn9, EnTs. CdTe). Calculnece on peri metro <strong>de</strong> teorla Tight-Blndlog qua pereite<br />
<strong>de</strong>serever o cariter matinee <strong>da</strong>ta semicendutorem, mon<strong>de</strong> fUn<strong>da</strong>mental ns <strong>da</strong>ter elnegio <strong>de</strong> forms qualitative<br />
<strong>de</strong> eatruture <strong>de</strong> bends. <strong>de</strong>stes compostos.<br />
A tamales eeprega<strong>da</strong> beagle-so no =Fangio dm constants dielitrIca se torso <strong>de</strong> use frequinele<br />
sidle, m goal <strong>de</strong>fini<strong>da</strong> convInientementel A *apnoeas <strong>de</strong> al(0) e a sepolots:<br />
le)a-e)<br />
1 2 F<br />
c (0).11-<br />
1 2 2<br />
:f r2<br />
bs1AN I<br />
w<br />
0 2 0 is m<br />
do (1)<br />
A partir doe nepectron experimental@ <strong>de</strong> porta imegineri ■ <strong>de</strong> Menlo disliirleO, po<strong>de</strong>mos calculer<br />
negundo terse <strong>de</strong> eq. (1), cos m precleio quo fie <strong>de</strong><strong>de</strong>s experimental@ permitlrem. Bete mond° term<br />
sera relecionado a estruture do bends, do seelcoodutor, umando-se on Haelltinlano NTIONT-8101110"<br />
tip* NALL-WEIRS. prioriaando as interenem antra orbltals.do seems item° orbitel ■ <strong>de</strong> ;tomes vial -<br />
nhos. As finnan <strong>de</strong> ands otilisa<strong>de</strong>s eerie do tipo CANNIER, conel<strong>de</strong>reodo coeblnanes lineares <strong>de</strong> orbited<br />
■ ablelicell (bibrldlzagio 80). Os orbitals "do non band's dm velinele serio consi<strong>de</strong>red° sewndo<br />
VAN MOVEN.<br />
(1) R.N. Nu<strong>de</strong>s. J.0. Ramos and P.A. Volff, Phys. Rev. 817, 1813 (1978)<br />
(2) J.A. Brum end 4Afia Ram. Agibl Mtatw rolimmairntinnw um n, Hanel<br />
SEM/PAINEL IEFEITO DA ANISOTROP1A EN eitorennou il2TRiCA9 DE 8ENICONDUT08ES. Venilleatris<br />
Cm es (Deportment° <strong>de</strong> Flalca,Univerei<strong>de</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong>Bio Carlos) e (hear Ripilito 111;rt 07ir eend<br />
iiPielea. Institutes <strong>de</strong> ?Wee e Quimica <strong>de</strong> Bie Carlos„USP).<br />
Naito. materiels qua tee apr ado grand. interesse cm pangolin atenleente apresenum ema<br />
lorte meisetropla, quo fat cos quo sues propriedi<strong>de</strong>s elitrieme varies ft:remnant@ do mord° con a<br />
diresio exemlea<strong>da</strong>. Visando amen<strong>de</strong>r este problems,mplicamos a sited° do cope sotoconsietestenCTA<br />
so gas do *agrees trldimensieual.conni<strong>de</strong>rando-sessilietropla ass =meas. Manta sproximegio sio in<br />
cloi<strong>de</strong>s as co/Telesis. <strong>de</strong> curto 'Wanes <strong>de</strong>ci<strong>de</strong>. le inter:ince coulamblana a <strong>de</strong> exchange. Calculi=<br />
mos o Ester <strong>de</strong> sotrutura S(q), ■,funglio <strong>de</strong> eorrelagio dos pares g(r), a energia <strong>de</strong>s excites:7cm<br />
E(f) e a 00000 ante :Idolatries i(g ■ e). This proprie<strong>da</strong><strong>de</strong>e sic emleule<strong>da</strong>s em fungi. do Angelo cam o<br />
arm a, <strong>de</strong> <strong>de</strong>r:si<strong>de</strong>d, do slitema e dm ratio intro on valorem <strong>de</strong>s mamas ties direne m peralelm o per<br />
predict:1er no ciao R. Emen reaoltodo ■ podvrele sir coopnrodos ens result:I<strong>de</strong>s expvrimenrale em maserials<br />
maisotrippicos, osindo-me pare 00000 corn parinatros dm mitred. on valorem dm consist:co die<br />
licrie ■ estItica e dm nesse em moo <strong>da</strong>m diregien.<br />
—
SEII/PAINEL JENERGIA DO ESTADO FUNDAMENTAL DE UM GAS DC ELETRONS SE POCOS QUAN-<br />
TICOS DE OaAm-Al Ga i. An. Umbrlino do Freitag Seto (Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Parai<br />
ba) a Marcos N. Began! (IFOSC, USP1.<br />
Calculamos a energia do emtado fun<strong>da</strong>mental <strong>de</strong> um gas <strong>de</strong> eletrons confinedos<br />
em pocos quinticos. Alem <strong>da</strong>m correcaes <strong>de</strong>vi<strong>da</strong>s aos efoitos <strong>da</strong>slcorrelacaes ele<br />
tranicas incluimos tambam, a correceo na energia <strong>de</strong>vido a interacio eletron-fonon<br />
longitudinal dtico. Analisamos o comportamento <strong>de</strong> energia do estado fun<strong>da</strong>mental em<br />
funcao <strong>da</strong> largura do poco, do <strong>de</strong>nsi<strong>da</strong><strong>de</strong> eletranica e do concentracao <strong>de</strong> alumlnio.<br />
SEM/PAINEL JIMPUREEA NIDEOGINICA EM SISTEMAS SEMICONDUTORES QUASE-UNIDINENSIO-<br />
Raiz. rranc.sco A.A. °sari*. Marcos E.Deoani a 0. Hipalito (IFOC-USPI<br />
A energia <strong>de</strong> ligacao <strong>de</strong> estados ligados a uma impure.. hidroganica loc.-<br />
'ha<strong>da</strong> no interior <strong>de</strong> um fio quantico (quantum vire), formado por uma regiao qua-<br />
se unidimensional <strong>de</strong> GaAs envolvi<strong>da</strong> porAL 1:a estu<strong>da</strong><strong>da</strong> em funcao <strong>da</strong>s dimen<br />
sae ■ do fio, <strong>da</strong> posicio <strong>de</strong> impureza, <strong>da</strong> <strong>de</strong>nsi<strong>da</strong><strong>de</strong> eletranica e <strong>da</strong> conceal -<br />
tracao R <strong>da</strong>l Al.<br />
SEMIPA1NEL U MOOED DIAGONAL S NAO-DthOONAL SK POCOS QUAyFIcoS DOPADOS. E. A. <strong>de</strong> Andra<strong>de</strong><br />
11111241, I.C. <strong>da</strong> Cunha Lam. C.C. Santos Leal e A. Ferreira <strong>da</strong> Silva. SICTilnotituto squria<br />
Csiza Postal 515, 11201 - Soo Jose dos Campos, SP, Brasil.<br />
A <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> maids, <strong>de</strong> impu am poeos quiptieo ■ Lea ■ id° ealeula<strong>da</strong> su<br />
pan<strong>da</strong> ono <strong>de</strong>sor<strong>de</strong>m spews diagonal ou spouts mio-diagooal on hamiltoniant "tight-binding" do ■ is<br />
tau. <strong>de</strong> Lopuresas distribui<strong>da</strong>s alaatoriaseste. lasemos. nests trabalho um di anis local<br />
do problem'. Datermismmos criterion pare am ■prosinscass acing s calculamo ■ <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> este<br />
dos pars vi r i oo porn, <strong>de</strong> dopagen eonsi<strong>de</strong>rando os <strong>da</strong>is efeitos.
SEM/PAINEL<br />
ESPALDAMF2ITO INTERDANDAS EM UM SISTEMA<br />
SEM1CONDUTOR QUASI - BIDIKENSIOKAL<br />
Hi<strong>de</strong>mbergue 0. Frota - Universi<strong>da</strong><strong>de</strong> do Amazonas<br />
Marcos H. Degani a Oscar Hipalito - USP<br />
Catu<strong>da</strong>mos um sistema semicondutor gmaai-bidimensional<br />
levanon em consi<strong>de</strong>ragao on espalhamentoe eletranicos intersub-<br />
ban<strong>da</strong>s. Tcamumk.o efeito <strong>de</strong> brin<strong>da</strong>gem na aproximagSo RPA. analimamos<br />
a matriz <strong>da</strong> fungi° dielatrica. o potential efetivo. a mo-<br />
bili<strong>da</strong><strong>de</strong> a as espoctros <strong>de</strong> freguancia <strong>de</strong> plasma.<br />
5EM/PAINEL IESTRUTURA CISTRONICA,MXCITONS C IMPURZZAS EM QUANTUM WIRES. VaLmir<br />
A. Chitta a Marcos H. Deciani (Institute <strong>de</strong> <strong>Fisica</strong> a Qufmica <strong>de</strong> Sio Carlos USP) e<br />
MIWItliarcruee (Dept°. <strong>de</strong> <strong>Fisica</strong>, Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Sito Carloe).<br />
Crescimento <strong>de</strong> heteroestruturas per MOCVD, MSC ou CDC, permit° control.<br />
preciso <strong>de</strong> parimetros tail come dose e/ou local <strong>de</strong> dopagem, espessura <strong>de</strong>s crowds'<br />
e principlamente a geometria <strong>da</strong>a heteroestruturas. Assim uma hetgrogstrutura do<br />
tipo *guilt <strong>de</strong> on<strong>da</strong>' coo secgao retangular perfeitamente viiveluif 41 hoje, a nela<br />
os portadores estio confinados bidimensionelmente a livres em uma anica diesel°.<br />
(Quantum Wire). Este sietema, alim do inters'se tmoricm tem grand° reIevincie ne<br />
construcio <strong>de</strong> lasers semicondutores. Aspect°. <strong>de</strong> estrutura eletranica em fungio <strong>de</strong><br />
dimensaes laterals, energia <strong>de</strong> ligaeao <strong>de</strong> elicitor's a impurezas hidroganicas eerie<br />
discutidos.<br />
(11 P.M. Petroff, A.C. Gossard, B.A. Logan and Wallegmamn, Phys.Lett.41,635(1982)<br />
(21 A.O. Fouler. A. Hartstein and M.A. Webb, Phys.Rev.Lett. 48 196 11982).<br />
SEM/PAINEL 1 ESTADOS aLEIRSRICOS AUT000NOICTINTIS CH P0008 QUENTICOS CON DM-<br />
US MAMA I( CM PRESCHCA De CAMPO eatel.00 MUM. Clines Bo iitio_Nar ne ■ e<br />
Paulo Daniel Ronal. (Depertimmesto <strong>de</strong> Fteica, Doiversi<strong>da</strong> s e era i-Sae Car es .<br />
Retool°. <strong>de</strong> 'Inertia optics en betero-e tttttt ras semicondutota ■ spreselatam arse<strong>de</strong><br />
verie<strong>da</strong><strong>de</strong> do ■ itoagaes fisica. eztremamente inters. ttttt s was <strong>de</strong> diffeil inter.<br />
prated° <strong>de</strong>vido i dif tt s contributed.e sofa coma sfeitos <strong>de</strong> molter carpels.<br />
coupes elitrico ■ iutri <strong>de</strong>ri<strong>de</strong>s i imp . nip parabolici<strong>de</strong>d ■ <strong>de</strong>s bands.,<br />
t emperature s etc. De cert ■ forma, efeitos do unites carpool e coupes eIitricol<br />
luminesces natio sews jonto, pais on ptimairos <strong>de</strong>pends° <strong>de</strong> <strong>de</strong>nsids<strong>de</strong> eletrint-<br />
c ■ quo d 'attempt, influencisd ■ pales ■esondon. Cos disposes naletive i passive!<br />
■e crier one situatio on<strong>de</strong> ■ spliced° <strong>de</strong> um tempo *little° esters° pods set omedn<br />
perm se comptroller o efeito <strong>de</strong> tempos [large ttttt o semis is <strong>de</strong>terminer e ttttt ibul<br />
cio dos efeitos <strong>de</strong> noltos corpus apes... Ealeols-se Out istentenente ■ estrus<br />
tura 'Islamics me h -estr ttttt n doped's seleti <strong>de</strong> um dos lo<strong>de</strong>s e sob a<br />
ado <strong>de</strong> um compo eletrico extern°, spliced° perpendicul to is interfaces dc<br />
mistime. Discs forma, pods-se <strong>de</strong>terminer es di tttttt contribui<strong>de</strong>s i atenorcid<br />
Optic., limatio <strong>de</strong>s Ceps efetives do enersie. etc.
SEM/PA1NEL I "CARACTERIBACAO DE Ga i _xAlxAs CRESCIDOS POR MOCVD A PRESSAO ATHOS<br />
FERICA". Aorton Andre Bernussi, Aldionso Marques Machado a Paulo Motisuke<br />
Sio apresentados mete trabalho, °spectre:is fotoluminescincia a 300 E e 2 R <strong>de</strong> fit<br />
mas <strong>de</strong> Ga1-x Al x As niodopados. Observamoa, I tomperatura ambient., a existincla <strong>de</strong><br />
duos transigHes em virias <strong>da</strong>m amostras analisa<strong>da</strong>s. Eats Xeparagio <strong>da</strong>s ban<strong>da</strong>s, pa-<br />
<strong>da</strong> astir relaciona<strong>da</strong> com a existincia <strong>de</strong> duas composlcoas na liga ou, cos a conta<br />
minagio por impurezas con energies <strong>de</strong> ligagio qua variam com a compomicio <strong>de</strong> Al.<br />
Os aspectrow obtidoa a 2 x par. algumas <strong>de</strong>fame amostram, indicaram qua a impure..<br />
residual pradominante 6 o carbon.<br />
UGH - UNICAMP<br />
CPqD - Telebras<br />
SEM/PA1HEL IPROPRZEDADES 6PTICAS DE LIGAS DE SILICLO-NITROCtNIO PREPARADAS POR<br />
SPUTTERING RP. J.R. Dias do S11va, J.1. Cisneros. M.P. Cana° a F.C. Marques., Los<br />
tituto <strong>de</strong> Prates - Unicamp - CP 6165 - 13081 Campinas. SP.<br />
Filial fines <strong>da</strong> lig. SiIrcio-NitroOnio con concencrag - 1 <strong>de</strong> nitrogi<br />
n io foram <strong>da</strong>p <strong>da</strong>s polo sated° "Sputtering Re. Foi ussdo um also <strong>de</strong> Miche pu<br />
ro nuns stoma's ■ <strong>de</strong> Ari.N 2 .11 2 . For msio <strong>de</strong> Radicles <strong>de</strong> m Optics foram <strong>de</strong>-<br />
terminadns 'Indies ds refragio s o coeficleute <strong>de</strong> absorgio am fungiia <strong>de</strong> energia<br />
<strong>da</strong> radlagio inki<strong>de</strong>nte. 0 gap Sptico foi calcuIado 'usando ■ snort. dr Tauc. Foram<br />
tsmtsiim medido ■ os aspects°s <strong>de</strong> tranantsnlo na raga.° do infravermelho os qualm mod<br />
tram as ban<strong>da</strong>s <strong>de</strong> absorglo correspoo<strong>de</strong>ntes 2 vibrag'io <strong>de</strong>s ligagges (Si-11). (Si-N)<br />
e (11-R).<br />
Foi ob <strong>da</strong> uma gran<strong>de</strong> 'variagio <strong>de</strong> Eg a dos mimeos <strong>de</strong>s llgagiis ■ (S1 - 11)<br />
(N-H).para um valor critica <strong>da</strong> <strong>da</strong>s press -Oe ■ P. .<br />
11 2 tot<br />
SEmiPAINEL<br />
TITULO: "Estrutura Eletranica em Pogo. Quinticos <strong>de</strong> Samiconduto<br />
re ■ <strong>de</strong> 'Gap-Zero'. (HgTe, HgSa)<br />
Sebastilo Rocha A. Hato, Gilmar Euginio Marques<br />
Dept9 <strong>de</strong> <strong>Fisica</strong> - Univ. Fe<strong>de</strong>ral <strong>de</strong> Sio Carlos - SP<br />
A reglio <strong>de</strong> comprimento <strong>de</strong> On<strong>da</strong> manor qua B microns nio i coberta por<br />
nonhum samicondutor simples ou composts).<br />
Cartes liga ■ <strong>de</strong> semicondutoras possuem um gap longo o suficiente para<br />
cobrir seta rogiio, com a vantages adicional <strong>de</strong> quo este gap i fungio <strong>da</strong> concon<br />
tragic), o qua permits uma escolha <strong>de</strong> !abut do trabalho do diapositive.<br />
Estamos estu<strong>da</strong>ndo a estrutura eletranica em posos quinticos do<br />
Hgl_ xCd xTe - Hgl. xCdxSe coma fungio <strong>da</strong> comentragio, em torno <strong>da</strong> transisio semi<br />
condutor-semimetal.
L<br />
SEM/PANEL APLICACAO DO KETODODE ACREGADO CRISTALINO AO ULCULO DE DEFEITOS Ell CBISTAIS<br />
IONICOS. Paulo S. Miseries, NCT/Instituto <strong>de</strong> Pesquisas Espaciai ■ - UWE, CP:<br />
515, 12201 - Sin Jos; dos Campos, SP, Brant; e Nanoel L. Stquetra, Universi<strong>da</strong><strong>de</strong> Fe<strong>de</strong>ral <strong>de</strong> Kt<br />
nos Gerais - UFNC, Belo Horizonte, MG, Brasil.<br />
' 0 metodo <strong>de</strong> agregodo crinolime i um mito<strong>de</strong> <strong>de</strong> prliseiroo principios <strong>de</strong> Wi<strong>de</strong> pare<br />
escudo <strong>de</strong>s proprie<strong>da</strong><strong>de</strong>s aletrintcas <strong>de</strong> cristsi ■ por nolo <strong>de</strong> age:ma<strong>da</strong>m molecular's Fors tanto<br />
lupins-se ao agregado condicio <strong>de</strong> contemn cristalinos <strong>de</strong>qusdos. No cam do estudo <strong>de</strong> <strong>de</strong>fei<br />
tom no ceistsis els tem, nitre outras, vantage, <strong>de</strong> <strong>de</strong>flate' no referential do armee& Unice<br />
tante pars o "graved° quo represents o eclat:al quint° pars "e quo Omuta o <strong>de</strong>files no yds<br />
tsl. Neste trabalho utilicamos o mitodo do agregado cristalino, <strong>de</strong>ntro do formmlismo do asps-<br />
lhamento maltiplo ■ pars estu<strong>da</strong>r alms d ■fettos importaste ■ no cleceto <strong>de</strong> midi°.<br />
ERIZACAO POR ACB C SINN DC FILM DC TIN C Bill PRODUZIDOS<br />
Pon 'SPUTTERING' REATIVO. Carina aabalmamdzi MAMA manimmnicormumi.<br />
Oa nitretom <strong>de</strong> titanic' e @Maio eao carecterisados por possuirems<br />
atabili<strong>da</strong><strong>de</strong> guimica. boas proprie<strong>da</strong><strong>de</strong>s dieletricem e alto duresa. Per into.<br />
tee sido co<strong>da</strong> ves makor o Intereeee no <strong>de</strong>senvolvisento <strong>de</strong> novas tecnicas pare<br />
Produce° <strong>de</strong> Moms finos <strong>de</strong>ats materials. Pilsen linos donnas nitretos tem<br />
sift aplicados tanto na industria microeletronica ( per ex. BIN como cased&<br />
ieolante ). come na industria mecanica ( por ex. Tin oleo cama<strong>da</strong> dura Para<br />
redusir o <strong>de</strong>mote <strong>de</strong> forramentas ).<br />
Neste trabalho sap &presented°, os remultados <strong>da</strong> caracterlsacao cos<br />
espectroacopia <strong>de</strong> eletrons Auger (A1B) a empectronetria <strong>de</strong> massa <strong>de</strong> lone<br />
secun<strong>da</strong>rioe (BIM) <strong>de</strong> filmes firma <strong>de</strong> TINle Bill. Os filmes foram <strong>de</strong>posita<strong>de</strong>s<br />
por 'sputtering' reativo as etsomfera <strong>de</strong> organic, ■ nitrogenio. e coleus is<br />
observer. nos films produsidos por est meted°. uma dtermina<strong>de</strong> contaminate°<br />
por impuregas comp oxigenio carbono. 0 nom, principal obJetivo a investigar<br />
a influencie <strong>de</strong>nten contaminentem nom proprie<strong>da</strong><strong>de</strong>s dos nitretoa.<br />
=P77-11<br />
SEl IEL 'BSTODO DA DIFIJBAD DB So CM InGsAs (In 531 a Ga 47%) - B.A.S.Sato.<br />
P.J. Shieh - CPqD-TELEBRILS - Campinas.<br />
Mosso objetivo a estu<strong>da</strong>r a varlacio dos parametros <strong>da</strong> difusio <strong>de</strong> Sn_lam<br />
InGaAo, e utilisi-lo posterioropote pare crier umeregiao Para fabricagao<br />
<strong>de</strong> foto<strong>de</strong>tetores do tipo PIN.<br />
utilisamoe on nooses estudos cristais do InGaAm cresoldos por epitaxia<br />
<strong>da</strong> fame liquid(1.PC), oam concentracio residual <strong>da</strong> or<strong>de</strong>m <strong>de</strong> 10 15 portadores/cm ° .<br />
Determlnamos ! varlagio <strong>da</strong> profundl<strong>da</strong><strong>de</strong> <strong>de</strong> juncio cam o tempo e cam a<br />
temperature <strong>de</strong> difusao.<br />
Atravos_<strong>da</strong>s mdi<strong>da</strong>s <strong>de</strong> CV letrolitico fol lavantado o_perfil dos porta -<br />
dores <strong>da</strong> difusao. observamos um comportamento abrupto <strong>da</strong> junco°. o qua JustifIca<br />
o use <strong>de</strong>nte tipo <strong>de</strong> processo no febrloacio <strong>de</strong> <strong>de</strong>tetores <strong>de</strong> InGaAs.<br />
Como complementacio do trabalho estu<strong>da</strong>remos o comportamento <strong>de</strong>sea jungio<br />
abrupta tom no tratamento termico, slmulando o processo ds fabricacao do <strong>de</strong>tstor.<br />
Tantaremos aln<strong>da</strong> madIr a solubili<strong>da</strong><strong>de</strong> efollela do En em InGaks.
SEM/PAINEL I BANDA II ralEr:A3 LW =ICOIMUTORE3 DE 'CAP' 1VOIRSTO<br />
Maraca Servio Picuoiru - OFP; Sergio Saul UML:lor - OFF;<br />
Enrique Victoriano Ben<strong>da</strong> - UFF.<br />
Neste trabalho sio autu<strong>da</strong>doo on somicoudutoreo dopadoo do_tgap' indireto,<br />
pars conocntrageos <strong>de</strong> impureesa quo =rim ate a concentrageo crItica, ondo<br />
gnome a tranelcan metal-isolants 0 =o<strong>de</strong>lo i <strong>de</strong>ocrito por as Haalltonicuto<br />
pars duaa bunch's' hibridinainn num bum <strong>de</strong> Aimee° do on<strong>da</strong> do Kohn a Luttinj-or<br />
quo levam cm costa a ootrutura do muitoo valco duo banduo <strong>da</strong> matrix hoepedoira.<br />
0 Hamilton/am a rcoolvido na Apra:image° CFA pola ticnica <strong>da</strong>o Fungaos do Ireen.<br />
A <strong>de</strong>corum a trata<strong>da</strong> Ira Aproximagao do lhitoubara a loyozawu. Ao correlagese sdo<br />
loopiu cao inclui<strong>da</strong>o no go<strong>da</strong>lo atruven do um calculo quo lava cm coma a dtpon<strong>de</strong>ncia<br />
<strong>da</strong> conntunto dieletrica coati= cm a :rotor do on<strong>da</strong>. 2 faits uma aplicacao<br />
pure o aia.<br />
SEM/PAINEL 1 ' FAB RI CACAO DE DIODOS LASERS EM 1 ■1.3um USN= EPITAXIA OE FARE<br />
- Jose Roberto Caumo a Wilson Carvalho Jr. - CS/D-TELEBRAS - 13.085 -<br />
Campinas - SP.<br />
Diodos lasers com emissio em 11.31m usando a liga quaterniria InGaAsP sio<br />
bastante utilisados on comunicagio aptica. Apresentaremos resultados do <strong>de</strong>senvol -<br />
',leant° a fabricacio dos dispositivos utilizando epitaxia <strong>de</strong> Ease liqui<strong>da</strong> pars o<br />
crescimento <strong>de</strong>s cama<strong>da</strong>s. Resultados <strong>de</strong> caracterizagao do material crescido, hem<br />
comp dos dispositivos fabricados serio discutidos.<br />
SEM/PAINEL -I- "CARACTERIZACAO DE CAMADAS DE InGaAsP POR CATODOLDIGNESCERcIA<br />
ESPECTRAL". - Ricardo Benetton Martins a Wilson Carvalho Jr. - ClID-TELEBRAS<br />
13.085 - Campine - SP.<br />
0 use <strong>da</strong> catodoluminescincia cam resolugio espectral associa<strong>da</strong> ao microscepio<br />
eletronica <strong>de</strong> varredura na caracterisagao <strong>de</strong> compostos do sistema quaternerio<br />
InGaAsP a recent° a vem apresentando resultados uteis pars ums melhor avalia<br />
coo dos tecnlcas <strong>de</strong> crescimento a <strong>de</strong>s caracteristicas intrInsecas do material.<br />
Neste trabalho apresentaremos resultados iniciais na caracterisagio <strong>de</strong> cams<br />
<strong>da</strong>s <strong>de</strong> material quaternerio cresaidos par epitaxia <strong>de</strong> Ease liquids.
SEM/PAlmEL 1 'TENPERATURA DE PORTADORES NA ELETROLONINESCINCIA OE HETEROESTRU-<br />
TUNAS DE GaAs/GaAlAs". - relive Nudge Barbosa - CPqD-TELEBRAS, 13.0115-Campinas,E1 1 .<br />
Pete analise dos espectros <strong>de</strong> eletrolumineseincia <strong>de</strong> dio<strong>de</strong>s emissores <strong>de</strong> lux<br />
po<strong>de</strong>obter informagio sabre a <strong>de</strong>pen<strong>da</strong>ncia funcional <strong>da</strong> distribuigio <strong>de</strong> portado<br />
res no bands <strong>de</strong> condugio, e a temperature <strong>da</strong> amostra. &Felton <strong>de</strong> reabsorgio <strong>da</strong> ra<br />
dingo no regido ativa modIficam essa distribuicao, alternando aselm o valor cal-<br />
culado <strong>da</strong> temperature. Apreentamoe noose trabaiho a discussio <strong>de</strong> dodos experimen<br />
tale obtidos a temperature ambient., pare varies amostras e diferentes <strong>de</strong>nsi<strong>da</strong><strong>de</strong>s<br />
<strong>de</strong> current. injeta<strong>da</strong>. Objetkvamos esclarscer os mecanismos qua contribuem pare ex<br />
plicacao dos resultados obtidos.<br />
SEM/PAIMEL 1 LASER OE HETEROESTRUTORA OE CONFINAMENTO SEPARA00 EM InPlInGaAP.<br />
S.Weinketz a F.C. do Prince.IFGW-Unicamp. ceapsnqs - SP<br />
A hateroestrutura do confinement° ■ eparedo a um modifitscao do loser ■ emtcon<br />
dutor <strong>de</strong> hetroestruture duple c nnnnn clonal. em quo i mile° ativa sea acr nnnnn to<br />
<strong>de</strong>s dues cama<strong>da</strong> ■ edf tos nnnnn parantes a radiegaa a <strong>de</strong> tondo prat:O<strong>da</strong> major<br />
do quo a regiao ativa. Assi.. os portedores sec confinado ■ ne reglio ative. ond<br />
dove ocorrer a recombine:tic. a a radiagio a confined. ne rglio etiva nos dues<br />
come<strong>de</strong>a adjasconLes (Buie do on<strong>da</strong> <strong>de</strong> since tornados). 0 efolto dioto d um aumento<br />
do confinements optic:: lfragao <strong>de</strong> radioed:: presents no melee calve! urns 00000 -<br />
Quanta dimlnultao do torrent. Maier.<br />
Aqui sio epresentados resultadoe prilminere <strong>de</strong> colculos do confinements op<br />
tics r <strong>da</strong> torrents limier .1, h pars lasers <strong>de</strong> InP/InGa&sP amitindo am 1.Sum, am<br />
fungio dos asps 00000 s do resi<strong>de</strong> ativa a dos commo<strong>de</strong>s conflnantes.<br />
ICNIN/Teloaris)<br />
SEM/PAINEL 1 CALCULI) DE GANN EM LASER DE "QUANTUM WELL' : N.C.Frateschi e<br />
N.B.Patel OFA - IFGW - MICANP - Campinas -SP<br />
Desenvolve-se um protease numirico <strong>de</strong> obtencio do ganho limier es fungio <strong>de</strong><br />
<strong>de</strong>nst<strong>da</strong><strong>de</strong> <strong>de</strong> corrente injeta<strong>da</strong> em lasers <strong>de</strong> "quantum well' <strong>de</strong> GaAs-GaAlAs.<br />
Neste cilculo preten<strong>de</strong>-se obter a <strong>de</strong>pendincia<strong>de</strong> ceractertsticaS <strong>de</strong> operacio<br />
do dispositivo em certos perimetros estruturels do laser, tail comp: expessura <strong>da</strong><br />
cama<strong>da</strong> ativa e numero <strong>de</strong> possos quinticos.
BEN/PAINEL<br />
1<br />
MEOIDAS DE INTERDIPOSA0 DE In EM NETEROESTRUTDRAS DE Inx<br />
Ga1-x<br />
As/<br />
GaAs - Fernando likawa, Paulo Motisuke UNICAMP e M.A.Sacilotti - CPq0 - Telebros.<br />
Medi<strong>da</strong>s <strong>de</strong> fotoluminesancia e absorcio a 2K em super-re<strong>de</strong>s <strong>de</strong> In x Ga 1-x As/GeAs<br />
obti<strong>da</strong>s antes a <strong>de</strong>pots dos tratamentos tirmlcos mostraram <strong>de</strong>slocamentoa dos picos<br />
correspon<strong>de</strong>ntes a recambinacOes doe elOtrons a burscos com n 1. A partir dos<br />
dodos experimentais a <strong>de</strong> um mo<strong>de</strong>lo <strong>de</strong> intordifue8o <strong>de</strong>terminamos o coeficiente do<br />
lnterdilusio do In e Ga.<br />
....■■ ■ ■■<br />
SEM/PAINEL<br />
"CARACTERIZACAO DOS LASERS OE TRSS E CINCO CAMADAS ATRAVES DA<br />
COMMUTE 'MODEM POR PEI= EISTRONICO". R.B.Martins e E.Conforto -<br />
CNO-TELEBRAS - Campinas-SP.<br />
A quali<strong>da</strong><strong>de</strong> e conilabili<strong>da</strong><strong>de</strong> dos lasers semboxidutores, era particular os diapositivos<br />
a base <strong>de</strong> =waft= vsm send, exaustIvamente analisa<strong>da</strong> em nossos laboratories fa-<br />
rando-se use <strong>de</strong> varies tanicas <strong>de</strong> oaracterixacio. 0 nose, trabalba esti baseado as uma<br />
&etas tionicas: a °ornate induxi<strong>da</strong> por feism eletrinioo loonbecl<strong>da</strong> internacilmalamnte<br />
comp ERIC), a goal a aseocia<strong>da</strong> ao micromodpio eletaNtioo ds varredura (EV).<br />
as alvos <strong>de</strong> nosses anilines foramen dues estruturas utiliza<strong>da</strong>s as fabrloagio <strong>de</strong> lasers<br />
semiconiutomes A beam <strong>da</strong> GaAlAs/GWAs1 o laser <strong>de</strong> tree =Was 03mcontato <strong>de</strong> faixa e o la<br />
ear <strong>de</strong> cinoo cams<strong>da</strong>s ass contain as V. Vi<strong>da</strong>, amostras foram caractariza<strong>da</strong>s atravile <strong>da</strong><br />
t0ailca <strong>de</strong> ERIC a ae results dbtidos tem si<strong>de</strong> kostante 6teis pare uma boa oxalis*<br />
<strong>da</strong> quaLi<strong>da</strong>ds1bdispositivo final. Neste trabatha mostrareaos um ream <strong>de</strong>ltas 4:accruegies,<br />
boa oamodisuutiremos alguns resultados ain<strong>da</strong> pouoo acapreerclidos qua mccessitam <strong>da</strong><br />
estudos sale omgaLexos.<br />
SEN/PAINEL i "PATORES ESTMUTURAIS ASSOCIADOS A RESISTUCIA SERIE NOM LASER<br />
DE HETEROESTRUTURA DUPLA GaAs/GaAlAs'. - E.Conforto a R.E.flartina -<br />
CNO-TELEBRAS - Campinas-SP.<br />
A resistincla stale (RS) 8 um paranstro <strong>de</strong> mama incortirscia emdispositimos optcoletr5<br />
nicoseasua influiacia sobxeofancitmimentosconflabilidi<strong>de</strong> dosses dispositivos tea sido<br />
°biota <strong>da</strong> muitos trabahos <strong>de</strong> pesquisa. Particularmante irsteressamtas pare ease estudo<br />
sio oe lasers semicomiutores <strong>de</strong> beteroestratura dupla <strong>da</strong> GaAa/GaklAs cmsecidos por epitaxia<br />
<strong>de</strong> fans ].!quids nom 5 =so<strong>da</strong>s a ccmtato as V. Neese dispositiwas 'Arlon fatores palms in<br />
fluarimovabor <strong>de</strong> Rs, notadmrente fatorme kw/cantos a eatrutura gsamitrica do cristal.<br />
Digpondo <strong>de</strong> um micros:160o eletrinioo <strong>da</strong> varredura utilirado na mo<strong>da</strong>ll<strong>da</strong>do <strong>de</strong> el8trons<br />
secundirios a pdvarando as amostras atravis <strong>de</strong> ataqus gulmboo selethm pare as virias coma<br />
dos, anallyamos varies lasers a observance urn correLscao entre o valor vodi<strong>da</strong> pars Rs e a<br />
disancle entreafrente <strong>de</strong> dIfusio <strong>de</strong> zneaoama<strong>da</strong> ativa do laser 12a. cama<strong>da</strong>).
SEM/PAINEL I COMPARACAO ENTRE AS TECNICAS OE CATOOOLUMINESCENCIA - E CORRELATE IN<br />
OUZIOA FOR PEIxE ELETRONICO. Ricardo Benetton Martins e C.A.Ripairo - Oniversi<strong>de</strong>=<br />
<strong>de</strong> Esteduol <strong>de</strong> Campinos - / nsiliZto do <strong>Fisica</strong>-LP°.<br />
0 ostudo dos dispooltivon somicondutorss por meta do tienieee nime d Ives<br />
do 'rands inters's°, a catodoluminescincio ICL1 e e torrents induxi<strong>de</strong> por fsixe<br />
sletranice IEBIC1 sea <strong>da</strong>is mitedos do grand. potential nests /impact.. no qual o<br />
estudo ds dsFsitos eristelinas tom particular into 00000 pore o <strong>de</strong>senvolviesnto <strong>de</strong><br />
dispositives optoolotranicos.<br />
Apresentem ■ tree/Oho uma comperecio entre vistas dues tionices quo tom<br />
principles Demons. Imes quo tom ceracterlsties ■ partieularoe. splieedss a um loser<br />
do hotnronvtr 00000 duple <strong>da</strong> noAs/GeAlAs.<br />
SEM/PAINEL CANACTSSIIIKAO DS COMPOSTOS III-V PARA DISPOSITIVOS OPTOELETNONI-<br />
COS. - Mario T.Furtado, Maria S.S. laurel. Antonio C.Sache a Wilson Carvalho<br />
C140-TELEBRAS.<br />
Sao apresenta<strong>da</strong>s medi<strong>da</strong>s <strong>de</strong> fotoluminescancia e CV eletroquimico em on:ma<strong>da</strong>m semicondutoras<br />
<strong>de</strong> compost= III-V cresci<strong>da</strong>s par apitaxia on Ease liqui<strong>da</strong>. Cama<strong>da</strong>s <strong>de</strong><br />
hetereestrutura duple <strong>de</strong> GaAlhe e InGeAsP/InP, ham como monocama<strong>de</strong>s <strong>de</strong> GeAlAs.<br />
InGeas a InP foram investiga<strong>da</strong>s. A analisa por fotoluminescancla tambam inclui o<br />
estudo <strong>de</strong> regions nio radiative. qua <strong>de</strong>pee<strong>de</strong>m <strong>da</strong> potrincla <strong>de</strong>_excitagio. Os perfis<br />
<strong>de</strong> <strong>da</strong>pagem medidos por CV eletrovimico sacs homogenises a estao correlacionados<br />
com os espectros <strong>de</strong> fotoluminescencia. Alam dies°, o comprimento <strong>de</strong> difusio <strong>de</strong><br />
portadores minoritirios em GaAlAs <strong>de</strong> tipo p foi estimado, e o espactro <strong>de</strong> absorcao<br />
<strong>de</strong> GaAIAa foi calculado via o formalism° do balanco <strong>de</strong>talhado.<br />
SeM/PAINEL I PROPRIECDOES ELETROSICAS 00 031PLEXO FERRO-BORD LW MAIO. Lucy . V.C. Assa-<br />
li a Josd Roberto Lelte (Institute <strong>de</strong> <strong>Fisica</strong> <strong>da</strong> Universi<strong>da</strong><strong>de</strong> <strong>de</strong> Slo Paulo)<br />
Calculamos a estrutura eletrdinica do complex° Ferro Interstitial -boro substitutional em sill-<br />
CIO utillrando 0 mo<strong>de</strong>l° do aglomerado molecular <strong>de</strong>ntr0 do formalism° do mdtodo do espalhament0<br />
'maniple Me . com tratsmento dos orbitals <strong>de</strong> superffcle atravds <strong>da</strong> esfera <strong>de</strong> Watson:<br />
AdotandS um aglomerado que consiste em um Atom° central <strong>de</strong> Fe na posicRo intersticial tetraddrica,<br />
um Atom° <strong>de</strong> 8 substitutional primeiro vizinho ao Fe a malt alto condos <strong>de</strong> Demos<br />
<strong>de</strong> Si ciassificados <strong>de</strong> acordo cos a simetria C31Ii1 do aglomerado.<br />
Mossos resultados mostram que o mo<strong>de</strong>lo microscopic° apropried0 pare <strong>de</strong>screver o pare covalen<br />
to em contrasts co, o mo<strong>de</strong>l° idnico usualmente aceito. Asslm, a formacdo dos estados <strong>de</strong> Impure-<br />
211 po<strong>de</strong>m ser <strong>de</strong>scritos a parttr dos orbItalS moleculares <strong>da</strong>s impurelaS IsOla<strong>da</strong>s. NOSSOS resultados<br />
tie comparados cam as evi<strong>de</strong>ncias experlmentais <strong>de</strong> EPA obti<strong>da</strong>s pare o complex° Fe-B com<br />
Slmetria axial na dlrecao 41 1 1, .
SEWPAINEL<br />
CALCUL° DA esuurum DE BANDAS 8 PROPRIEDADES RELACIONADA8<br />
G.F. <strong>de</strong> Mello e G.8. Barberic<br />
Unicomp. 13100. Cenpinee. S.F.<br />
Celculanos as ben<strong>da</strong>s <strong>de</strong> 19 semicondutores cgmetruture mincblen<strong>da</strong> usando o<br />
nitodo empfrico Tight-binding none base minims Well). (on<strong>de</strong> 0-4. um pseudo-es-<br />
til<strong>de</strong> excitedo) e tambin usmndo o mikado ab-initio ASV con aproximecio linear rely<br />
tirfstics e <strong>de</strong> satires vssies.(2) e (3).<br />
°harems em ambos os =lo<strong>de</strong>s as <strong>de</strong>nsi<strong>de</strong><strong>de</strong>s <strong>de</strong> escudo partials e totals. le<br />
tames agora cmtculendo a <strong>de</strong>nsi<strong>de</strong><strong>de</strong> <strong>de</strong> corp. a constant* dielftrice e a refletivT<br />
<strong>da</strong>d.. Para meted° Tight-binding *stenos mend° orbitals etonlcos.<br />
Compares°, os resulted°. Wei<strong>de</strong>, entre es dole meted°, e tembim con results<br />
doe <strong>de</strong> literature obli<strong>de</strong>s polo mstodo empfrico <strong>de</strong> peoudopotencials.<br />
Bibliografi ■<br />
l.Vogl end Dom - J.Phys.Chem.Solids.vol.44. n 9 5,345, (1983)<br />
2.111111ems. nobler. Gelmtt - Phys.Rer.B19. 6094 (1975)<br />
3.8ompe et al - Phys.ne ►.Letters S2. 671 —(1984)<br />
SEM/PAINEL<br />
IFAERIC4410E CAAACTIAIZACAO OE ARMORS OE DETETORES OE PS. Sn Te. E. Abrams',<br />
S 0 C. Soscheeti. S.P. dm Cunha. I.A. Ma<strong>de</strong>ira. MT/Institute <strong>de</strong> Parities sizurr-<br />
INFEVIEFTT5. 12201 - Sao .1.----n—eWci oseoN.111711riWirr<br />
arrenjos dm <strong>de</strong>tail:me ■ ■io fabricadog dm 'NYB ("Rot Wall !pitmen"). Al co-<br />
ned... eon asp <strong>de</strong> .2 on e eoncentragio <strong>de</strong> poreadores n: 1 :10 111cor'. ■io i<strong>de</strong>s en un<br />
substrates <strong>de</strong> PbTe do eipo n(Sole scors). Eseu<strong>da</strong>-so a homosenei<strong>de</strong><strong>de</strong> doe acranjos medin<strong>de</strong>-se as<br />
<strong>de</strong>citivi<strong>da</strong><strong>de</strong>s. cognomens espectrai ■ e tempos <strong>de</strong> reignites <strong>de</strong> cads <strong>de</strong>tetor a 775.<br />
ccuiparmeL J ESTRUTURA ELETRONICA OE CRISTAIS ATRAVES DE MET0(105 MOLECULARES;<br />
W.V.M.Machado, 0.L.Kinoshita. M.L.<strong>de</strong> SiCueira. L.G.Ferreira.<br />
Tanta o Meted° Celular Variational (NCV) quanta o geo<strong>de</strong> do Espallmnento Multi-<br />
ple (14S) po<strong>de</strong>m ser associados a ticnica dos agregodos (clusters) cristalinos criando mom ferramenta<br />
important* con a quel se consoguo reproduzir as principals caracterlsticas <strong>da</strong> estrutura ele<br />
trinice <strong>de</strong> um cristal infinite. En ambos os cases a equacio <strong>de</strong> SchriledInger aresolvi<strong>da</strong> no agree<br />
do molecular par. os virios estados ocupados e a <strong>de</strong>nsido<strong>de</strong> eletrinica, esfericamente sinitrica.dos<br />
atomos representatives <strong>de</strong> cads espicie. transferi<strong>da</strong> pare o cristal e repeti<strong>da</strong> no redo infinita.Na<br />
regiio interesfirica a <strong>de</strong>nsi<strong>da</strong><strong>de</strong> <strong>de</strong> cargo sera aquela que ineutraliza a cargo <strong>de</strong> esfera. A equacio<br />
<strong>de</strong> Poisson i eatio resolvi<strong>da</strong> no cristal e o potential resultante colocado em um formstomuffin.tio<br />
e transferido novemente pare o agregado.<br />
Cilculos realizados con o oxi<strong>de</strong> e o seleneto <strong>de</strong> zinco (do grupo 11-VI) evi<strong>de</strong>ncia<br />
ram qua a abor<strong>da</strong>gen &troves do MCV cristalino se mostra eflciente <strong>de</strong>s<strong>de</strong> qua o nivel 3d do zinco<br />
esteja suficientemente espacado do p do tope do band. <strong>de</strong> ralincia (ea.ZnSe) No case <strong>de</strong> pequena se<br />
para<strong>de</strong> entre os referidos 'awe's.* MS i mats vantajoso.
SEM/PA1NEL<br />
PROOJCAO E CARA1ERIZA00 OS FILMES FIN)S CC TWEET° OE CAOHIO (CdTe).<br />
Carlos Lulz Ferreira, Institute Winer <strong>de</strong> Engenherla.<br />
Filers linos <strong>de</strong> Telureto <strong>de</strong> Cd<strong>da</strong>io silo praduzidos !droves do aquectmanto dos grins <strong>de</strong> CdTe pets<br />
pessagem <strong>de</strong> use corrente eldtrica per uma barquinha <strong>de</strong> mlilb<strong>de</strong>nlo. Apds a dissociatflo do mate-<br />
rial, d reeliza<strong>da</strong> a loniza703 dos Atoms <strong>de</strong> Cddmlo a Teldrio, @troves <strong>de</strong> um feixe <strong>de</strong> eldtrans,<br />
e os Ions sin acelerados pare o stbstrato. Os filmes pro<strong>da</strong>ldos sd3 ceracteriza<strong>da</strong>s quarto a<br />
morfalogia etraves <strong>de</strong> abservacbes no microscopic: eletrAico <strong>de</strong> varredura a pale tdcnIca <strong>de</strong> dl-<br />
fracflo <strong>de</strong> ralo-X. A ceracterizeclio eldtrlce 6 reelizads atraves <strong>de</strong> entitles <strong>de</strong> Melt° Hall,<br />
enquento a carecterizacft otica d obti<strong>da</strong> strives <strong>de</strong> medi<strong>da</strong>s <strong>de</strong> &soma° &ice. Estudos mtis<br />
<strong>de</strong>telhedos <strong>de</strong> composiclo, pardmetros oticos e fotoeldtricos, serio realizedos no Solar Energy<br />
Research Institute (SERI) atravds <strong>de</strong> us programa <strong>de</strong> colaboreclo.<br />
5E14/PANEL J MALISE DA IMTERrACE . AMR= HadEads. Cai122 GAUD.<br />
Hamm GADALDD MALIMO. Lana (LE'll/SE101/COPPE/UM).<br />
Heterojuncoes do tkpo Bilicio Boort° Nidrogenado (a -81:11)/Osido<br />
<strong>de</strong> Indio a Estanho (ITO) sao culto utilised.. es celula solarize <strong>de</strong> a -Si:R. 0<br />
estudo do interdifutemo mates heterojunCoes a Important. <strong>de</strong>vkdo ao 'stereos.<br />
em otimizar a eficiencia <strong>de</strong>letes asinine. Neste trabalho. Interface antra<br />
eatas cama<strong>de</strong> a eatu<strong>da</strong><strong>da</strong> or Espectroscopie <strong>de</strong> Eletrons Auger.<br />
Atravea <strong>de</strong> porgies <strong>de</strong> profundi<strong>da</strong><strong>de</strong> a arch.. <strong>da</strong> forma dos piccolo<br />
Auger, .etu<strong>de</strong>s-se os processor <strong>de</strong> interditusao gun ocorrem sesta interface<br />
guando os filmes sao submetidos a tratamentoc termicos em vacuo. R tambem<br />
nalisa<strong>da</strong> a influencia <strong>da</strong> dopagem do -SI:H. bee come <strong>de</strong> uma cama<strong>da</strong> do °sift<br />
<strong>de</strong> Bilicio <strong>de</strong>posita<strong>da</strong> na interface. sabre este. processor.<br />
SEN/PAINEL I TaAsSICOES DB PASS asTassaaars SOS passsio: DERICONDUTODED TIPO ZINCELENDA R<br />
HEXAGONAL "CLOSE PACKED". Sandra F. Carrara a Casten S. aarberis - Institute <strong>de</strong> Hairs, UNICARP.<br />
(Wood* o mitodo <strong>de</strong> nod. ■ osfirlems aumeogodool (ASV) sao calcula<strong>da</strong>s as translcie ■ <strong>de</strong> fame dos<br />
compootoo CdS, CdSe a CM nob pressio. 0 cilculo <strong>da</strong> 'tearer total permit. obi's, Bleu <strong>da</strong>m bands.<br />
▪ <strong>de</strong>nsi<strong>da</strong><strong>de</strong> ■ <strong>de</strong> sece<strong>de</strong>. es pariamtros <strong>de</strong> red!, om addulom taunt*. e es colors, <strong>de</strong> fermata° dilates<br />
compost°s pars cads use <strong>de</strong> mum@ fames. Sao ap <strong>de</strong>s ma mu<strong>da</strong>nces nos proprle<strong>da</strong><strong>de</strong>s ■ iati-<br />
ca ■ come !unties <strong>da</strong> preemie. Os remeltadom ebtidom sao couparadom can as <strong>da</strong>dos experimental@ ..t<br />
1. A.R. 111111o.o. J. Koehler nod C.D. Gelatt.Jr. Phys. Rey. 11 19. 6094 (19 79)