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Re^2: MCSCF calculation with and without state averaging / merits and drawbacks

Patrick SK Pang
pangsiukwong@gmail.com


Dear Sanya,

I am interested in the optimized geometry and the electronic energy of each excited state; therefore I will perform geometry optimization of each excited state using the MCSCF method. Can I say the use of state averaging in my case is redundant?

Regards,

Patrick

On Mon Oct 8 '12 11:44pm, sanya wrote
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>State-averaging is necessary when you study quasi-degenerate or excited states. In state-specific calculation, the resulting orbitals are best for the selected state, while in the state-averaged calculation the orbitals are sort of compromise, because they are best for several states. However, state-averaging is the only way to obtain a common set of orbitals for several states.

>On Mon Oct 8 '12 6:33pm, Patrick SK Pang wrote
>----------------------------------------------
>>Dear all,

>>What are the merits and drawbacks of using state averaging in MCSCF calculation? Similarly, What are the merits and drawbacks of MCSCF calculaton without state averaging?

>>Thanks!

>>Patrick


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