Search found 4 matches

by duvalmbongo
Thu Mar 28, 2013 8:00 am
Forum: VTSTTools
Topic: Problem with vibrational frequencies calculation
Replies: 6
Views: 14621

Re: Problem with vibrational frequencies calculation

Dear Prof Graeme,

Yes it was a bug
I download the new version and compile.

Now I get real frequencies but still have a problem because there is no imaginary frequency. As I said yersterday It is a saddle point, so I expect one imaginary frequency.
Here are the 3 frequencies:

339.845608 cm^{-1 ...
by duvalmbongo
Wed Mar 27, 2013 3:02 pm
Forum: VTSTTools
Topic: Problem with vibrational frequencies calculation
Replies: 6
Views: 14621

Re: Problem with vibrational frequencies calculation

Dear Prof Graeme,
I use VTST version 3.0b which was compile as describ on VTSTT site and it is recognise by VASP.
I attached the OUTCAR file of my calculation.
by duvalmbongo
Wed Mar 27, 2013 1:55 pm
Forum: VTSTTools
Topic: Problem with vibrational frequencies calculation
Replies: 6
Views: 14621

Re: Problem with vibrational frequencies calculation

Dear Prof Graeme,
Thank you for your reply,

VASP has ran the 4 iterations, here is the my OSZICAR file:

N E dE d eps ncg rms rms(c)
DAV: 1 0.119767145293E+04 0.11977E+04 -0.17463E+05 6720 0.117E+03
DAV: 2 -0.320113797180E+03 -0.15178E+04 -0.15124E+04 10080 0.214E+02
DAV: 3 -0.334084640930E+03 -0 ...
by duvalmbongo
Wed Mar 27, 2013 9:46 am
Forum: VTSTTools
Topic: Problem with vibrational frequencies calculation
Replies: 6
Views: 14621

Problem with vibrational frequencies calculation

Dear all,

I need help!

I am calculating the diffusion pre-factor of He-diffusion in fluoro-apatite
unit cell. To do so, I did the NEB and CI-NEB calculation to find
activation barrier energy and the MEP pathways as explained in the VTSTTcode. Now I am
calculating the vibrational frequency of He ...