Hemmer and Stell model

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The Hemmer and Stell model intermolecular pair potential, , is given by (Ref. 1 Eq. 2, Ref. 2 Eq. 1-3):

where a short range piece-wise potential

where , is the hard core radius, along with a long-range attractive potential;

where is a positive constant.


  1. P. C. Hemmer and G. Stell "Fluids with Several Phase Transitions", Physical Review Letters 24 pp. 1284 - 1287 (1970)
  2. G. Stell and P. C. Hemmer, "Phase Transitions Due to Softness of the Potential Core", Journal of Chemical Physics' 56, pp. 4274-4286 (1972)