Orbital switching



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 >
 > How can one achieve the best control over the electronic state of a
 > molecule (within Gaussian program)?.
 >
 > When the orbital switching fails to give the correct state [instead it
 > collapse to the lowest energy state during geometry optimization], what
 one can
 do
 > about it?.
 Also, which are the recommended method for excited state calculations
 (I am interested in the excited state geometry).
 >
 > Thank you
 >
 > Sunoj
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 >