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