Search found 2255 matches

by graeme
Tue Oct 27, 2009 5:57 pm
Forum: VTSTTools
Topic: Checking if Cl-NEB is installed
Replies: 1
Views: 6518

Re: Checking if Cl-NEB is installed

It looks fine to me. We may have changed the output at some point to
NEB: image is at an extrema
instead of explicitly saying that the image is the climbing image.

We'll add a message like then in the next update -- it makes sense to have one.
by graeme
Mon Oct 19, 2009 5:49 pm
Forum: Bader
Topic: charge integration using CHGCAR
Replies: 1
Views: 7468

Re: charge integration using CHGCAR

An integral of a surface density? No we have not implemented this. We are working on a representation of the surfaces, and could include the integration of surface charge if there was a good reason. What information can you gain from this? Or am I not understanding your goal; do you want to specify ...
by graeme
Thu Oct 15, 2009 4:22 am
Forum: VTSTTools
Topic: EAM force
Replies: 1
Views: 4915

Re: EAM force

This was a little trick to evaluate an empirical (EAM) force and use that to replace the DFT force. This way, there was no error in the force and we could compare exactly to another code. It is only turned on with a compiler flag and the linking of another library.
by graeme
Sat Oct 03, 2009 3:08 am
Forum: VTSTTools
Topic: Using the Jacobian instead of the Hessian for optimization
Replies: 1
Views: 5081

Re: Using the Jacobian instead of the Hessian for optimization

It sounds like you know more about these methods than we do. This sounds like a good suggestion.
by graeme
Sat Sep 26, 2009 7:45 pm
Forum: VTSTTools
Topic: Will the NEB code be successfully builded into VASP5.2?
Replies: 5
Views: 11226

Re: Will the NEB code be successfully builded into VASP5.2?

Ah yes, you are right. The extrapolation for T->0 to get the energy is not done with the forces. So the forces are consistent with the free energy and not the T->0 energy.
by graeme
Fri Sep 25, 2009 3:52 pm
Forum: VTSTTools
Topic: Will the NEB code be successfully builded into VASP5.2?
Replies: 5
Views: 11226

Re: Will the NEB code be successfully builded into VASP5.2?

It uses the force that is printed in the OUTCAR. This is the derivative of the energy, not the free energy.
by graeme
Fri Sep 25, 2009 5:47 am
Forum: VTSTTools
Topic: Will the NEB code be successfully builded into VASP5.2?
Replies: 5
Views: 11226

Re: Will the NEB code be successfully builded into VASP5.2?

yes it can; we have not seen any problems yet
by graeme
Fri Sep 11, 2009 4:57 am
Forum: Bader
Topic: charge distribution on grid points
Replies: 4
Views: 10344

Re: charge distribution on grid points

Use the -p atom_index or -p bader_index
by graeme
Thu Sep 10, 2009 9:43 pm
Forum: Bader
Topic: charge distribution on grid points
Replies: 4
Views: 10344

Re: charge distribution on grid points

The CHGCAR is the charge density at each point in real space.
by graeme
Sun Sep 06, 2009 4:36 am
Forum: Bader
Topic: Can the CHG file also be analyzed?
Replies: 2
Views: 8287

Re: Can the CHG file also be analyzed?

No, the CHG file does not have enough precision in many cases, and we do not support the analysis of it. If you want to analyze a particular structure, you will need to generate a CHGCAR file.
by graeme
Fri Sep 04, 2009 9:52 pm
Forum: VTSTTools
Topic: Use of ALGO=FAST, LREAL=A, NSIM=4 in Dimer/NEB
Replies: 4
Views: 11242

Re: Use of ALGO=FAST, LREAL=A, NSIM=4 in Dimer/NEB

I you send us the dimer and/or NEB calculations, we'll take a look and try to see what's going on.
by graeme
Fri Sep 04, 2009 9:50 pm
Forum: Bader
Topic: segmentation fault
Replies: 2
Views: 8985

Re: segmentation fault

My guess is that the program has run out of memory. Can you post the command that you ran? If you asked it to print any of the Bader or Atomic volumes, try turning that off. You could also just monitor the memory use as it runs and see if it hits the machine limit. The calculation is basically done ...
by graeme
Mon Aug 24, 2009 12:37 am
Forum: Bader
Topic: asymmetric bader charges
Replies: 12
Views: 24653

Re: asymmetric bader charges

Can you check to see if the asymmetry goes away with increasing grid density? If it does not, there is a problem. Without knowing your grid density, we can't know if a 0.02 e difference is a problem.
by graeme
Fri Aug 21, 2009 2:20 pm
Forum: VTSTTools
Topic: HOW to watch the movie generated by nebmovie.pl?
Replies: 4
Views: 10209

Re: HOW to watch the movie generated by nebmovie.pl?

If you post the headers and a few atomic coordinates from each file type, we'll be able to debug the problem.
by graeme
Wed Aug 19, 2009 1:25 am
Forum: VTSTTools
Topic: Use of ALGO=FAST, LREAL=A, NSIM=4 in Dimer/NEB
Replies: 4
Views: 11242

Re: Use of ALGO=FAST, LREAL=A, NSIM=4 in Dimer/NEB

These dimer calculations do not look good. First, you can always set ALGO, LREAL, NSIM, NPAR ... to improve efficiency. The dimer calculations are not near a saddle, and they are not obviously converging towards one. Something doesn't look quite right here. Do you have ediff set to a low value (arou...