[gmx-users] Re: parameter of RB potential for OPLS force field
Mark.Abraham at anu.edu.au
Tue May 19 00:32:05 CEST 2009
Yanmei Song wrote:
> Dear Justin:
> Thanks for your response. I saw this in the ffoplsaabon.itp, which I
> think is a Periodic potential.
So check out table 5.4 in the manual and find out for sure!
> [ dihedraltypes ]
> ; i j k l func coefficients
> ; Added DvdS for Quartz simulations
> SI OS 1 0.000 3.766 3
> SI OH 1 0.000 3.766 3
> Does this mean that we can still use a periodic potential combined with
> OPLS force field since it seems OPLS also consists of the periodic
> potential besides RB. It doesn't have to be necessary to use RB for the
> proper dihedral when you use OPLS force field, right?
What's necessary is to use parameters and functional forms that have
been demonstrated to be parameterized for your observables. Mixing
functional forms doesn't seem like something to encourage, but if it's
been done already and you're happy with their results, then go for it.
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