<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">As in textbooks: by calculating phonons all over the Brillouin zone (in practice, on a regular grid), and them by calculating {\hbar \over 2} \sum_{{\bf q},\nu} \omega_{{\bf q},\nu}. SB<DIV><BR><DIV><DIV>On Jul 25, 2005, at 6:46 PM, 胡朝浩 wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">Dear PWscf users,<BR>In PWscf codes, how can I obtain the results of zero point energy by phonon calculation?<BR>Thanks in advance.<BR><BR>Best regards,<BR>Chaohao<BR><BR><BR><BR> <FONT style="font-size:14.8px"> <BR> <BR><P style="line-height:160%;"> <A href="http://mail.163.com" target="_blank"> <FONT color="blue">需要一个<SPAN style="color:red">2000兆的免费</SPAN>邮箱吗？<BR>网易免费邮箱是<SPAN style="color:red">中国最多人使用</SPAN>的电子邮箱。</FONT></A><FONT color="blue"> </FONT></P><FONT color="blue"> </FONT></FONT></BLOCKQUOTE></DIV><BR><DIV> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">---</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Stefano Baroni - SISSA<SPAN class="Apple-converted-space"> </SPAN>&<SPAN class="Apple-converted-space"> </SPAN>DEMOCRITOS National Simulation Center - Trieste</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">[+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype)</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Please, if possible, don't<SPAN class="Apple-converted-space"> </SPAN>send me MS Word or PowerPoint attachments</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">Why? See:<SPAN class="Apple-converted-space"> </SPAN><A href="http://www.gnu.org/philosophy/no-word-attachments.html">http://www.gnu.org/philosophy/no-word-attachments.html</A></FONT></P> </DIV><BR></DIV></BODY></HTML>