This directory (TT_Modified_HellmannBichVogel_2007_He) contains an ab initio ground state He+He pair potential.
The potential comprises of two parts:

1) Ab Initio well and dispersion potential for separation distances > ~2a0 which was given
by

Bich E., Hellmann R., and Vogel E. 2007. Ab initio potential energy curve for the helium atom
pair and thermophysical properties of the dilute helium gas. Mol. Phys. 105.

2) For separation distances < ~2a0 a screened coloumb potential was fit to the ab initio potential.
This screened potential is such that the potentials and its derivatives are smooth.

The following files are in this directory:

LICENSE.CDDL
     The Common Development and Distribution License (CDDL) Version 1.0 file

Makefile
    makefile to compile and build the Model based on the specified KIM Model
    Driver

README
    This file

TT_Modified_HellmannBichVogel_2007_He.F03
		model for the pair potential