Hemmer and Stell model
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The Hemmer and Stell model intermolecular pair potential, Φ12(r), is given by (Ref. 1 Eq. 2, Ref. 2 Eq. 1-3):
- Φ12(r) = Φ12(r)repulsive + Φ12(r)attractive
where a short range piece-wise potential
where 
, d is the hard core radius, along with a long-range attractive potential;
- Φ12(r)attractive = − aγexp( − γr)
where a is a positive constant.
