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force constant matrix or dynamical matrix

From: Xinyuan Zhao <xinyuan@physics.rutgers.edu>
To: forum@abinit.org
Subject: force constant matrix or dynamical matrix
Date: Thu, 30 Oct 2003 10:32:44 -0500 (EST)

Dear abinitioners,

I did some linear response calculations using ABINIT. I'm trying to do
some post-analysis, and need the force constant matrix or dynamical
matrix. At first thought, I used the 2DTE weighted with the related atomic
masses. But the frequencies I got seem different from those calculated by
ABINIT.

Maybe your experience could help me in this issue. Thanks a lot.

xinyuan

references: Guidelines for presentation, mmikami, 10/30/2003
- force constant matrix or dynamical matrix, Xinyuan Zhao, 10/30/2003