From: Brian Radak (bradak_at_anl.gov)
Date: Sat May 14 2016 - 15:39:48 CDT
For zeroed LJ interactions you can use epsilon = 0 and any Rmin/2 value
you choose. If you don't want to zero _all_ interactions with atoms of
that type, then you should add an NBFix.
On 05/14/2016 06:29 AM, Sourav Ray wrote:
> For two particles without LJ interaction, the c6 and c12 values (in
> GROMACS topology file) are set to 0. If I would like to incorporate
> the same to a CHARMM parameter file, I need to convert them to
> sigma-epsilon form.
> Since the usual conversion formula will result in 'divide by 0' error.
> I presume we can set epsilon = 0 and sigma to some arbitrarily high
> value well beyond the LJ cut off (or any random value because epsilon
> is zero), any suggestions?
> Thanks and regards
-- Brian Radak Postdoctoral Appointee Leadership Computing Facility Argonne National Laboratory 9700 South Cass Avenue, Bldg. 240 Argonne, IL 60439-4854 (630) 252-8643 brian.radak_at_anl.gov
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