Perturbation version of the Percus–Yevick equation: the square-well potential

Abstract

A perturbation treatment of the direct correlation function for the attractive forces in a fluid with the hard sphere reference system is given and the static structure factors are calculated in the framework of a square-well potential. The compressibility equation of state obtained analytically predicts the pressure very well for a relatively small perturbation potential. All these calculations are compared with Monte Carlo and molecular dynamics results of other workers for this system.