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27 THE MRCC PROGRAM OF M. KALLAY (MRCC) 199<br />

Examples: Closed-shell ground-state calculations for H2O:<br />

***,mrcc calculations for h2o<br />

memory,8,m<br />

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

geometry={<br />

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

theta=104<br />

r=1 ang<br />

basis=vdz<br />

hf<br />

mrcc,method=cc3;<br />

method(1)=program<br />

e(1)=energy<br />

ccsd(t)<br />

method(2)=’CCSD(T) (<strong>MOLPRO</strong>)’<br />

e(2)=energy<br />

mrcc,method=ccsd(t)<br />

method(3)=’CCSD(T) (MRCC)’<br />

e(3)=energy<br />

mrcc,method=ccsdt,dir=mrccdir<br />

method(4)=program<br />

e(4)=energy<br />

!CC3 calculation<br />

!the final energy is returned in variable energy<br />

!CCSD(T) calculation using Molpro<br />

!CCSD(T) calculation using MRCC<br />

!CCSDT calculation, run in directory mrccdir<br />

mrcc,method=ccsdt(q),restart=1,dir=mrccdir !CCSDT(Q) calculation<br />

!restart with previous amplitudes<br />

method(5)=program<br />

e(5)=energy<br />

mrcc,method=CC(n),excitation=4,restart=1,dir=mrccdir !CCSDTQ calculation<br />

method(6)=program<br />

e(6)=energy<br />

table,method,e<br />

http://www.molpro.net/info/current/examples/h2o_mrcc.com<br />

This yields<br />

METHOD<br />

E<br />

CC3 -76.23912734<br />

CCSD(T) (<strong>MOLPRO</strong>) -76.23905150<br />

CCSD(T) (MRCC) -76.23905150<br />

CCSDT -76.23922746<br />

CCSDT(Q) -76.23976632<br />

CCSDTQ -76.23973043<br />

Excitation energies for H2O:

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