Professor Paulo, thanks for your reply. Will do that. Elie
> From: giannozz at democritos.it > Date: Fri, 24 Aug 2012 12:06:56 +0200 > To: pw_forum at pwscf.org > Subject: Re: [Pw_forum] Negative frequencies at really low threshold > convergence > > > On Aug 23, 2012, at 20:46 , Elie M wrote: > > > I still get that the three first values of the frequencies are > > negative. > > Does this confirm the instability of the system? > > likely, but you should first of all verify the effect of applying the > Acoustic Sum Rule. > > P. > --- > Paolo Giannozzi, Dept of Chemistry&Physics&Environment, > Univ. Udine, via delle Scienze 208, 33100 Udine, Italy > Phone +39-0432-558216, fax +39-0432-558222 > > > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20120824/4d3595ce/attachment-0001.htm
