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46 BASIS SET EXTRAPOLATION 349<br />

2.) Using a procedure for the extrapolation:<br />

By default, variable ECBS is optimized, but other variables (e.g. ECBSD) can be specified using<br />

the VARIABLE option on the OPTG command.<br />

geometry={o;h1,o,r;h2,o,r,h1,theta}<br />

theta=102<br />

r=0.96 ang<br />

basis=vtz<br />

proc cbs34<br />

hf<br />

ccsd(t)<br />

extrapolate,basis=vtz:vqz<br />

endproc<br />

optg,variable=ecbs,proc=cbs34<br />

http:<br />

//www.molpro.net/info/current/examples/h2o_extrapol_opt3.com<br />

geometry={o;h1,o,r;h2,o,r,h1,theta}<br />

theta=102<br />

r=0.96 ang<br />

proc cbs34<br />

basis=vtz<br />

hf<br />

ccsd(t)<br />

eref(1)=energr<br />

ecc(1)=energy<br />

basis=vqz<br />

hf<br />

ccsd(t)<br />

eref(2)=energr<br />

ecc(2)=energy<br />

extrapolate,basis=vtz:vqz,eref=eref,etot=ecc<br />

endproc<br />

optg,variable=ecbs,proc=cbs34<br />

http:<br />

//www.molpro.net/info/current/examples/h2o_extrapol_opt4.com<br />

46.4 Harmonic vibrational frequencies using extrapolated energies<br />

This is possible by defining the extrapolation in a procedure:

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