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# Copyright (c) 2013, Regents of the University of Minnesota.
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# Contributors:
#    Ryan S. Elliott
#    Ellad B. Tadmor
#    Valeriu Smirichinski
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This directory contains a shifted Lennard-Jones pair potential model driver
written in Fortran 90.

   phi(r) = 4 * epsilon * ( (sigma/r)^12 - (sigma/r)^6 ) + shift

where 'shift' is computed so that phi(rcut) = 0.0, and 'rcut' is the
cutoff radius.

It allows alteration of its parameters,  and supports optional computation of
`energy', `forces', `particleEnergy', `process_dEdr', and `process_dE2dr2'.

To create a KIM Model from this Model Driver, a parameter file is required.
This file must have the following format:

   Line 1: chemical symbol of the atomic species, e.g. Ar
   Line 2: `cutoff' value in angstroms
   Line 3: Lennard-Jones `epsilon' value in eV
   Line 4: Lennard-Jones `sigma' value in Angstroms