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42 GEOMETRY OPTIMIZATION (OPTG) 325<br />

42.4.4 Optimization using geometry DIIS<br />

***, CAFFEINE cartesian coordinates (XYZ format)<br />

memory,1,m<br />

basis=sto-3g<br />

geomtyp=xyz<br />

geometry={<br />

24<br />

CAFFEINE CARTESIAN COORDINATES<br />

C 0.8423320060 -0.3654865620 0.0000000000<br />

C -0.2841017540 -1.1961236000 0.0000000000<br />

N 2.0294818880 -1.1042264700 0.0000000000<br />

N 0.0774743850 -2.5357317920 0.0000000000<br />

N -1.6472646000 -0.6177952290 0.0000000000<br />

C 1.4531962870 -2.3678913120 0.0000000000<br />

C 0.6373131870 1.1735112670 0.0000000000<br />

C -1.7812691930 0.7688916330 0.0000000000<br />

N -0.6771444680 1.6306355000 0.0000000000<br />

O 1.6106752160 1.9349693060 0.0000000000<br />

O -2.9202890400 1.2510058880 0.0000000000<br />

C -0.9202462430 3.1094501020 0.0000000000<br />

C -2.8623938560 -1.4824503660 0.0000000000<br />

C 3.4552156930 -0.6811094280 0.0000000000<br />

H 2.0878150460 -3.2451913360 0.0000000000<br />

H -1.4989252090 3.4222116470 -0.8897886280<br />

H -1.4989252090 3.4222116470 0.8897886280<br />

H 0.0071905670 3.7148499490 0.0000000000<br />

H -3.4903070930 -1.2888938190 -0.8907763360<br />

H -3.4903070930 -1.2888938190 0.8907763360<br />

H -2.6289534570 -2.5638654230 0.0000000000<br />

H 4.1360211370 -1.5529079440 0.0000000000<br />

H 3.6817059520 -0.0685850980 0.8931597470<br />

H 3.6817059520 -0.0685850980 -0.8931597470<br />

}<br />

hf<br />

optg,savexyz=caffeine.xyz<br />

coord,bmat<br />

method,diis<br />

!save optimized geometry in file caffeine.xyz<br />

!Optimization in natural internal coordinates<br />

!Optimization method: Geometry DIIS<br />

optg,coord=bmat,method=diis,savexyz=caffeine.xyz<br />

!same as above<br />

http:<br />

//www.molpro.net/info/current/examples/caffeine_opt_diis.com<br />

42.4.5 Transition state of the HCN – HNC isomerization<br />

The first example shows how to do a MP2 transition state optimization. The initial Hessian is<br />

taken from a previous HF frequency calculation.

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