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The Hemmer and Stell model intermolecular pair potential, , is given by (Ref. 1 Eq. 2, Ref. 2 Eq. 13):
where a short range piecewise potential
where , is the hard core radius, along with a longrange attractive potential;
where is a positive constant.
References[edit]
 P. C. Hemmer and G. Stell "Fluids with Several Phase Transitions", Physical Review Letters 24 pp. 1284  1287 (1970)
 G. Stell and P. C. Hemmer, "Phase Transitions Due to Softness of the Potential Core", Journal of Chemical Physics' 56, pp. 42744286 (1972)