<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">2015-11-09 20:29 GMT+01:00 <a href="mailto:liyincumt@gmail.com">liyincumt@gmail.com</a> <span dir="ltr"><<a href="mailto:liyincumt@gmail.com" target="_blank">liyincumt@gmail.com</a>></span>:<br><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<div><span></span><div style="font-size:14px;line-height:21px">the optical modes should not be affected by the acoustic sum rule correction. However, in my case, the low-frequency optical modes are affected a lot <span style="line-height:1.5;background-color:window"> </span><span style="line-height:1.5;background-color:window">by the acoustic sum rule correction. E</span><span style="line-height:1.5;background-color:window">ven high frequency optical modes are affected by the acoustic sum rule correction to some extent. Does it mean that I am using a wrong ASR.</span><span style="font-family:"""></span><span style="line-height:1.5;background-color:window"> My current ASR is </span><span style="line-height:1.5;background-color:window"> 'zero-dim'.</span></div></div></div></blockquote></div><br></div><div class="gmail_extra">first of all, try 'simple'. If the situation doesn't improve: your calculation might not be sufficiently converged (tr2_ph parameter too large)<br><br>Paolo<br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><span><span><font color="#888888">Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone <a href="tel:%2B39-0432-558216" value="+390432558216" target="_blank">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222" target="_blank">+39-0432-558222</a></font></span></span></div></div></div></div>
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