Re: AMBER: force field question

From: David A. Case <>
Date: Thu, 27 Sep 2007 08:45:38 -0700

On Thu, Sep 27, 2007, Eddie Men wrote:

> I am using the ff03 force field for proteins and preparing a system for
> constant pH simulations. In p. 172 for the online manual, the ff99 force
> field is used, where in particular the file frcmod.mod_phipsi.1 is loaded.

This file is intended for use with ff99, *not* with ff03. It is also rather
outdated by now. You should probably use either ff03 (be sure to apply
bugfix.5 if you are using Amber 9) or ff99SB.


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Received on Sun Sep 30 2007 - 06:07:28 PDT
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