[Pw_forum] Problem of the underestimation of the frequency caused by matdyn.x

[Paolo Giannozzi]

On Oct 9, 2006, at 16:15 , li yan wrote:

>        I  calculated the phonon frequencies of FeO for a list of  
> generic
>    q vectors with q2r.x and matdyn.x. In the FeO.dyn files , the  
> highest frequency is about 43 THz, while it is about 22 THz in the  
> matdyn.modes file and FeO.freq file.   What problems may occur in  
> the the process?

wrong masses? Paolo