Solntsev Pasha
solntsev@univ.kiev.ua
>On Thu Nov 18 '10 4:15am, Solntsev Pasha wrote
>----------------------------------------------
>>Same thing with XMCQDPT2 (CASSCF(7,7))
>Actually CASSCF(14,14)
Sorry, my fault. I didn't understand exactly this notation.
>> ********** ROUTINE MQCACI **********************************************
>>***** ERROR: MEMORY REQUEST EXCEEDS MAXIMUM.
>> 1692001415 WORDS REQUIRED 140000000 AVAILABLE.
>> EXECUTION OF FIREFLY TERMINATED ABNORMALLY AT 18:58:04 LT 17-NOV-2010
>The XMCQDPT code is very flexible so you can dramatically
>reduce memory needs using additional keywords in the $xmcqdpt
>group. Please let me know if you need some help with this.
Sure. We used TD-DFT (w/ and w/o PCM + different potentials) but we were not able to reach acceptable agreement with experiment. So i decided to use XMCQDPT2. The main problem is active space. From TD-DFT it looks like we need 7 occupied and 6 unoccupied orbitals. But i wanted to check a little bit higher active space CAS(16,16).
Also it is not clear for me. How many NSTATE should i use in $DET?
Or situation with that parameter almost same like with active space and i need to try different number of NSTATE.
>> $MCSCF cistep=aldet maxit=200 micit=200 $end
>Regardless on your initial question, it's very bad idea to set micit to 200.
Hm.... I thought it this is a max number of micro-iterations and i can safety increase this parameter. I will try default mode.
>> $XMCQDPT inorb=1 edshft=0.2 kstate(1)=1,1,1,1,1,1,1,1,1,1 $END
>edshft=0.2 is the really HUGE shift. The recommended value is 0.02. Note, this is ISA shift (that is similar to imaginary shift), not
>the plain denominators shift (0.2 would be OK with plain shift).
Again my fault. I saw posts about MCSCF and people used 0.02. Sorry.
>Regards,
>Alex Granovsky
>