AMBER Archive (2007)Subject: Re: AMBER: TI calculation: charge is not zero in the perturbed state
From: David A. Case (case_at_scripps.edu)
Date: Sat Mar 03 2007 - 15:11:52 CST
On Sun, Mar 04, 2007, brmeher_at_iitg.ernet.in wrote:
>
> Also I checked the charge of the system before loading the .frcmod file and
> found to be zero, but unfortunately after loading .frcmod the charge of the
> system is not zero (-0.158200),
First, please try to send email as plain text, not html...thanks
Your report is weird, since loading a frcmod file should have no effect on the
charges. What were the exact commands you used to check the charges before
and after the frcmod loading?
Note that -0.1582 is exactly twice -0.0791, which may point you to something.
In the table you sent, you had a dummy atom (CD1 in the perturbed state) with
a non-zero charge ( -0.0791). Since dummy atoms should never have a charge,
I am sure this is not what you want. But it is not easy to see how this
happened from you description.
...good luck...dac
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