Re: AMBER: improper dihedral

From: David A. Case <>
Date: Fri, 26 Jan 2007 08:09:55 -0800

On Fri, Jan 26, 2007, lishan yao wrote:

> I want to assign angle parameters for NH3 molecule. I don't know whether
> I should use three angles or two angles and one improper dihedral angle to
> restrain the molecule. Could you please comment on it?

A good start would be to use antechamber to generate a force field, then study
the result. Since there is no one "correct" way, you are free to explore
other force field possibilities. For your second alternative, be sure to pay
attention to making all three H atoms equivalent.


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Received on Sun Jan 28 2007 - 06:07:42 PST
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