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Re: Re: Re: [abinit-forum] geometry optimization


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  • From: paul.boulanger@umontreal.ca
  • To: forum@abinit.org
  • Subject: Re: Re: Re: [abinit-forum] geometry optimization
  • Date: Mon, 11 Jun 2007 09:58:47 +0200

Hi,

I peroused your input file and I found a possible error. Your SCF convergence
criteria, toldfe 1d-5, is probably not sufficient to get a reasonnable result
for forces. Hence, when relaxing the system with a criteria of tolmxf 5d-4,
you are probably sampling noise.

This can be checked in your output file. Look at the convergence of the
forces in the SCF results. I think a better parameter for the SCf
convergence should be toldff 1d-6. But, if your atoms are in highly symetric
positions (forces are all zero), you will be forced to use toldfe close to
1d-10. But, I don't think this is your case.

Paul



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