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33 SYMMETRY-ADAPTED INTERMOLECULAR PERTURBATION THEORY 250<br />

33.7 Examples<br />

33.7.1 HF-SAPT calculation of the H 2 O dimer using the δ(HF) correction<br />

gthresh,energy=1.d-8,orbital=1.d-8,grid=1.d-8<br />

symmetry,nosym<br />

orient,noorient<br />

GEOMTERY={<br />

1,O1,,0.00000000,0.00000000,0.00000000<br />

2,H1,,0.00000000,0.00000000,1.83606000<br />

3,H2,,1.77604000,0.00000000,-0.4656040<br />

4,O2,,-0.6605540,0.00000000,5.54064000<br />

5,H3,,-1.6582100,-1.4536300,6.05324000<br />

6,H4,,-1.6582100,1.45363000,6.05324000<br />

}<br />

basis=avdz<br />

!sapt files<br />

ca=2101.2<br />

cb=2102.2<br />

!dimer<br />

hf<br />

edm=energy<br />

!monomer A<br />

dummy,o2,h3,h4<br />

{hf; save,$ca}<br />

ema=energy<br />

sapt;monomerA<br />

!monomer B<br />

dummy,o1,h1,h2<br />

{hf; start,atdens; save,$cb}<br />

emb=energy<br />

sapt;monomerB<br />

!interaction contributions<br />

sapt,SAPT_LEVEL=3;intermol,ca=$ca,cb=$cb,icpks=1<br />

!HF supermolecular interaction energy and delta(HF) contribution<br />

eint_hf=(edm-ema-emb)*1000 mH<br />

delta_hf=eint_hf-e1pol-e1ex-e2ind-e2exind<br />

!add E2disp + E2exch-disp to HF interaction energy<br />

eint_sapt=eint_hf+e2disp+e2exdisp<br />

http:<br />

//www.molpro.net/info/current/examples/h2odimer_sapt_hf.com

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