[gmx-users] who can help me with the force-field?
Mark.Abraham at anu.edu.au
Sun Sep 20 21:47:56 CEST 2009
xiao shijun wrote:
> Hi everyone,
> Recently, I met a problem on the force-field. I am doing something
> on the calcium carbonate, and want to simulation it with gromacs.
> The shell model for oxygen has been emploied in my system. When I
> considered the non-boned potential associated with interactions between
> in the same CO3 group, I only need to take O-O buckingham interaction
> into account, but any electric interaction. How could I realize that in
> my .top file.
> First, I tried to use [pairs] to eliminate electric interaction, but
> I can't add the buckingham interaction of O-O because there is no
> options for LJC14. I want to know if anyone of you have such the
> experience. Thanks!!
Usually you would not define a nonbonded interaction for atoms that are
so close together, since their interaction should be able to be modelled
adequately with the C-O bond and O-C-O angle (and perhaps with CHARMM,
an interaction harmonic the O-O distance as a Urey-Bradley term).
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