<div dir="ltr">Dear users, <div><br></div><div>while calculating phonon frequencies at high pressure, some modes in optical branches disappear. can anybody tell me why this happen ? or is it my calculation error ?</div><div>
<br></div><div>Thanks & regards, </div><div><br></div><div><br clear="all"><div><div dir="ltr"><font face="trebuchet ms, sans-serif">Dr. Shyam G Khambholja,<br></font><div><font face="trebuchet ms, sans-serif">Indus University </font></div>
<div><font face="trebuchet ms, sans-serif">Gujarat </font></div><div><font face="trebuchet ms, sans-serif">India <br></font><div><br></div></div></div></div>
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