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<div><P>Hello pwscf developers:</P>
<P> What does the definition of "use_masses" in IONS card (mass-weighted) mean? </P>
<P>Whose masses are weighted? Is it the weight between the first_image and the last_image,</P>
<P>or just the weight in one configuration according to the masses of all the atoms? When should</P>
<P>we turn on "use_masses" to be .true.? <BR> I can't find the answers for these questions in "INPUT_PW" and this forum. Could any kind</P>
<P>one teach me for these? I'd like to appreciate any help very much!</P>
<P>Best Wishes!</P>
<P>Yours Sincerely</P>
<P>L. F. Huang</P>
<P class=usersign align=left>------<BR><BR>======================================================================<BR>L.F.Huang(黄良锋) lfhuang@theory.issp.ac.cn<BR>======================================================================<BR>Add: Research Laboratory for Computational Materials Sciences,<BR>Instutue of Solid State Physics,the Chinese Academy of Sciences,<BR>P.O.Box 1129, Hefei 230031, P.R.China<BR>Tel: 86-551-5591464-328(office)<BR>Fax: 86-551-5591434<BR>Web: http://theory.issp.ac.cn (website of our theory group)<BR>http://www.issp.ac.cn (website of our institute)<BR>======================================================================<BR></P></div>
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