[Pw_forum] what negative omiga means ?

陳 少華 chen_shao_hua197 at yahoo.com.tw
Thu Dec 14 11:30:48 CET 2006

Dear members,
I have a little question bothering me.After I
calculated the phonon dispersion. I got some negative
omiga values.
As I know ,image omiga means unstable.But what
negative omiga means ? I suppose it should be positive
value,if it is stable system.

Best Regards

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