CCL:G: excited state TDDFT



Markus,

I'm clearly not an expert on this... When you do the TDDFT or CIS without optimizing any particular state are S1 and S2 close in energy?  of the same symmetry?  It may be the case there could be a problem optimizing S2 when it is the same symmetry of S1.  Is there a problem optimizing S1?

My $0.02..

John McKelvey


On Mon, Oct 31, 2011 at 4:48 AM, Markus Schütz schuhtib=-=physik.tu-berlin.de <owner-chemistry:_:ccl.net> wrote:

Sent to CCL by: =?ISO-8859-15?Q?Markus_Sch=FCtz?= [schuhtib * physik.tu-berlin.de]
Am 27.10.2011 19:05, schrieb Markus Schütz schuhtib!A!physik.tu-berlin.de:

Sent to CCL by: =?ISO-8859-15?Q?Markus_Sch=FCtz?= [schuhtib::http://physik.tu-berlin.de" target="_blank">physik.tu-berlin.de]
Hello,

I tried to calculate the second excited state of adamantane cation (opt and freq) in TDDFT ( # TD(root=2,NStates=40) b3lyp/cc-pvtz opt sym=loose). Unfortunately the calculation ended with

'You need to solve for more vectors in order to follow this state.'

So I set the keyword for NStates first to 10 then to 25 and finally also to 40, but the message is the same.
I tried another way: From a cis calculation I wanted to get the force contants using them for the TDDFT calculation. But the cis calculation also ended with the message above (NStates=25). Is it useful to set NStates much higher or is there another way to do the TDDFT calculation?

By the way, I also tried a cis calculation (# CIS=(Root=2, NStates=40) hf/cc-pvtz opt(calcFC) freq sym=loose). This delivers the message

'Tx not orthogonal to T.'

I couldn't find any solution for this problem.

Regards,
Markus

Sorry,

forgot to say I'm using Gaussian09.

--
Markus Schütz
Institut für Optik und Atomare Physik
AG Dopfer
Sekretariat EW 3-1
Technische Universität Berlin
Hardenbergstraße 36
10623 Berlin

Tel +49 (0)30 314 29808

Raum EW 337



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