Hi,
The charges are always scaled with fudgeQQ.
For the LJ parameters the precendence is:
For an atom pair in the [ pairs ] section with type A and B:
if parameters are present on the line in the [ pairs ] section use those,
otherwise
if parameters are present in the [ pairtypes ] section use those, otherwise
if gen-pairs=no generate a fatal error, otherwise
if parameters for A-B are present in the [ nonbond_params ] section scale with
fudgeLJ and use those, otherwise
use the parameters for A and B in the [ atoms ] section and scale with fudgeLJ
and use those.
Berk
Date: Thu, 30 Jul 2009 15:58:40 +0800
From: ch...@nus.edu.sg
To: gmx-users@gromacs.org
Subject: [gmx-users] generate pair list and 1-4 interactions
Dear all,
I am a bit confused about how the pair potentials (PPs)are
calculated.
If I state explicitly sigma and epsilon values for the pair
potentials, can I then still have a coulomb scaling of my 1-4 interactions?
Say I set “gen-pairs” to “yes”,
although I have all possible pair potential interactions specified under “[
pairtypes ]”, would I then still be able to scale my 1-4 coulomb
interactions by setting a “FudgeQQ” different from 1? Also, would I
be able to scale the already given van der Waals interactions with “FudgeLJ”?
Finally, are generated pair potentials based on the parameters
specified under “[ atomtypes ]” or “[ nonbond_params ]”
(if the latter exist) in the ffamber03nb.itp file?
Best regards,
Soren Enemark
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