<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Dear Olga,<div>There are README files inside example directories to help you understand what is happening:</div><div>In vdw example.."The Thomas-Fermi and von Weizsacker approximation is used<div>to simplify the full calculation done in ph.x. It is expected</div><div>that this simplified calculation gives results deviating</div><div>about 20% comparing to that of the full one(checked for</div><div>methane and benzene)."</div><div>cheers,</div><div>emine kucukbenli, SISSA, Italy </div><div><br></div><br>--- On <b>Wed, 9/9/09, Olga Sedelnikova <i><xomiakk@gmail.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Olga Sedelnikova <xomiakk@gmail.com><br>Subject: [Pw_forum] vdw<br>To: pw_forum@pwscf.org<br>Date: Wednesday, September 9, 2009, 12:53 PM<br><br><div
id="yiv537799447">Dear all,<br><br>I cannot find any documentation about vdw code. Please describe basic approaches used for polarizability calculations. <br>Examples 33 and 34 illustrates how to use ph.x and vdw.x to calculate polarizability of methane molecules. But results do not agree esecially for static value. Which method is better?<br>
<br>Thank you,<br><br>Olga<br>
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