[Pw_forum] sufficient grid for phonon dispersion

[lan haiping]

hi, Ezad.
some related problems  have answered in this forum, you can try to find it.

stefano had answered my silly question (i think almost the same) :
"By and large, (squared) phonon frequencies are second derivatives of the
crystal energy for a given kinetic-energy cutoff. If a cutoff is OK for
geometry optimization, it  is also so for phonon calculation (see below) "

regards

hai-ping


On 10/18/06, Ezad Shojaee <ezadshojaee at hotmail.com> wrote:
>
> hi
> sorry if it is a silly question
> if we used a grid for calculating  phonon dispersion and we find that it
> is'nt sufficient, what should we do? defining another grid ( with more
> points ) and performing for all of it again?!
> is there any way to add some new points information to the previous grid ?
> thanx
>
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