[Pw_forum] Negative frequencies in phonon calculation

Cameron Foss cjfoss at umass.edu
Tue Jan 12 11:20:01 CET 2016

Hello all,

Recently I have experienced negative frequencies from a phonon calculation
that had been restarted after an unplanned interruption. The calculation is
for Transition Metal Dichalcogenide MoSe2 and WSe2. Is it possible for
negative frequencies to come from numerical errors from restarting the

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