Siddheshwar Chopra
sidhusai@gmail.com
Regards,
On Tue Mar 4 '14 1:45pm, Thomas Pijper wrote
--------------------------------------------
>Dear Siddheshwar,
>Please check your input file, specifically the $DATA group. It contains multiple errors.
>As to your question regarding optol 10-8 and NCONV=8, recall that the $STATPT group and its keywords (incl. OPTTOL) control the parameters for a geometry optimization. As to NCONV in $SCF, this controls the tightness of the SCF procedure.
>
>
>Kind regards,
>Thom
>
>
>
>On Tue Mar 4 '14 12:48pm, Siddheshwar Chopra wrote
>--------------------------------------------------
>>Dear Sir,
>>Your point taken perfectly. I will do as you directed. optol 10-8 and NCONV=8, what is the difference between these two?
>>Regarding TDDFT, I would be grateful if you could run the i/p file I sent you... I perhaps copied the wrong coordinates which resulted in the error. But when I added the correct coordinates, I ran the checkrun. It completed in seconds.. But again when I ran the same program properly, it completed in seconds.. And with NSTATE=100 and more. I dont know how it happened and the o/p file does't open with Gaussum. It gives some cclib parsing error. There is no calculation done at all and the o/p says...Program terminated normally. Please help. I cannot figure it out.
>>Regards,
>>On Tue Mar 4 '14 11:41am, Thomas Pijper wrote
>>---------------------------------------------
>>>Dear Siddheshwar,
>>>A few comments:
>>>$SCF NCONV=8 is very tight, I'd say that the default NCONV=5 would be sufficient in your case.
>>>$TDDFT NSTATE=100 is a lot of states. I expect that 30 to 40 states is enough if you are trying to obtain a UV/vis spectrum. This should speed up your calculation significantly.
>>>$CONTRL INTTYP=HONDO ICUT=11 ITOL=30 should not be necessary (unless you are calculating a numerical gradient). Same goes for $DFT LMAX=41 NRAD=99. This will help in speeding up your calculation.
>>>$BASIS GBASIS=N31 NGAUSS=6 is a very light basis set. I would at least try to add NDFUNC=1 (resulting in the 6-31G(d) basis).
>>>
>>>
>>>Kind regards,
>>>Thom
>>>
>>>
>>>
>>>On Tue Mar 4 '14 10:07am, Siddheshwar Chopra wrote
>>>--------------------------------------------------
>>>>Dear Sir,
>>>>Thank you for pointing out this silly mistake of mine. I will note this down now. As for the TDDFT calculations please find attached the i/p file. I have used the lowest energy state coordinates for the same. Please have a look at it.
>>>>Regards,
>>>>On Mon Mar 3 '14 5:51pm, Thomas Pijper wrote
>>>>--------------------------------------------
>>>>>Dear Siddheshwar,
>>>>>> I ran HEssian calculations on my sample first. I
>>>>>> got NO imaginary frequencies. But I could not find
>>>>>> "Equilibrium geometry located" text anywhere.
>>>>>This is because you specified RUNTYP=HESSIAN. This performs a Hessian calculation. The message "Equilibrium geometry located" appears only with a completed geometry optimization (RUNTYP=OPTIMIZE or SADPOINT). Your geometry does correspond to a minimum on the PES.
>>>>>
>>>>>
>>>>>> I run TDDFT calcs. But in that I am getting this error now:
>>>>>>
>>>>>> * ... LESS THAN �3.000
>>>>>>
>>>>>> **** THERE ARE ATOMS LESS THAN � 0.100 APART, QUITTING... ****
>>>>>
>>>>>
>>>>>Most likely you made an error in the $DATA group of the TDDFT calculation input. It could for example be that you specified a point group other than C1, but specified coordinates corresponding to the C1 geometry, thus causing some atoms to be specified twice. If you would like me to take a closer look at the problem, feel free to post the input file for your TDDFT calculation.
>>>>>
>>>>>
>>>>>Kind regards,
>>>>>Thom
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>On Mon Mar 3 '14 11:21am, Siddheshwar Chopra wrote
>>>>>--------------------------------------------------
>>>>>>Dear Sir,
>>>>>>I ran HEssian calculations on my sample first. I got NO imaginary frequencies. But I could not find "Equilibrium geometry located" text anywhere. Now thinking that it is a global minimum, I run TDDFT calcs. But in that I am getting this error now:
>>>>>> �* ... LESS THAN �3.000
>>>>>> **** THERE ARE ATOMS LESS THAN � 0.100 APART, QUITTING... ****
>>>>>>What is wrong here? What should I do next to rectify this. If the sample was not in global minima, then how come there were no imaginary freqs?
>>>>>>Regards,