Firefly and PC GAMESS-related discussion club



Learn how to ask questions correctly


Re^3: CASSCF optimized orbitals are not orthogonal for XMCQDPT

Alex Granovsky
gran@classic.chem.msu.su


Hi,

here comes the fixed input.

On Mon Mar 28 '11 1:29am, Alex Granovsky wrote
----------------------------------------------
>Hi,

>the origin of the problem is that you have used coord=cart.
>The input molecular geometry was reoriented at the very early stage
>and thus computed orbitals are for this reoriented geometry.
>Fortunately, there is a printout of the new coordinates (in bohr)
>at the beginning of the MCSCF output file so one can use them.
>Attached please find the fixed xmcqdpt2 input file attached
>to my next post. Unless you really need coord=cart and know exactly
>what you are doing, it is generally bad idea to use coord=cart.
>Use coord=unique (the default settings) instead.

>Regards,
>Alex Granovsky

>On Fri Mar 25 '11 7:31pm, Gena wrote
>------------------------------------
>>On Fri Mar 25 '11 5:58pm, Gena wrote
>>------------------------------------
>>>Hello!
>>>I try to calculate electronic absorption spectra using XMCQDPT. But after CASSCF calculation is successfully finished, XMCQDPT calculation with optimized MOs from CASSCF PUNCH-file fails in the very beginning listing unorthogonal to each other orbitals, and as i see it - they're all unorthogonal. Firefly also advises me to set INORB=0 to reorthogonalize them. But as XMCQDPT isn't parallel, it isn't convenient. Moreover, i don't understand the difference, i thought that would be the same CASSCF calculation, only in serial mode. Sorry for stupid question, i'm just studying multiconfigurational methods. What am i doing wrong?

This message contains the 2271 kb attachment
[ 3Ncirculene_XMCQDPT.fixed.rar ] xmcqdpt2 input file with error in molecular geometry fixed.


[ Previous ] [ Next ] [ Index ]           Mon Mar 28 '11 1:31am
[ Reply ] [ Edit ] [ Delete ]           This message read 997 times