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42 GEOMETRY OPTIMIZATION (OPTG) 327<br />

***, HCN NHC Isomerization - Transition State Optimization and Frequencies<br />

print,orbitals,civector<br />

rcn=1.18 ang<br />

rnh=1.40 ang<br />

alpha=55 degree<br />

basis=vtz<br />

geometry={<br />

C<br />

N,1,rcn<br />

H,2,rnh,1,alpha}<br />

closed,4<br />

! global setting for casscf inactive space<br />

hf<br />

! HF-SCF<br />

multi<br />

! CASSCF<br />

mrci<br />

! MRCI<br />

optg,root=2,variable=energd,hessproc=runrs2<br />

!optimize mrci+q transition state and caspt2 for<br />

runrs2={multi;rs2}<br />

---<br />

!procedure definition for caspt2<br />

http://www.molpro.net/info/current/examples/hcn_mrci_ts.com<br />

42.4.6 Reaction path of the HCN – HNC isomerization<br />

The following input first optimizes the transition state, and then performs reaction path calculations<br />

in both directions. The results are plotted.

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