<div dir="ltr"><div dir="auto">Dear Mostafa,<div dir="auto"><br></div><div dir="auto">Thanks for your reply.</div><div dir="auto"><br></div><div dir="auto">Can you give me a brief guide about how to resolve the issue of negative frequency when an optimized (with as low convergence threshold as possible; lower than that leading to convergence failure) geometry at a certain target pressure give negative frequency in phonon calculation.</div><div dir="auto"><br><div data-smartmail="gmail_signature" dir="auto">Subhodip Chatterjee<br>Senior Research Fellow<br>Department of Chemistry<br>University of Calcutta<br>Kolkata, India</div></div></div><div class="gmail_extra"><br><br></div>
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