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A perturbation approach based on the first-order mean spherical approximation(FMSA) is proposed. It consists in adopting a hard-sphere plus short-rangeattractive Yukawa fluid as the novel reference system, over which theperturbative solution of the Ornstein-Zernike equation is performed. A choiceof the optimal range of the reference attraction is discussed. The results arecompared against conventional FMSA/HS theory and Monte-Carlo simulation datafor compressibility factor and vapor-liquid phase diagrams of the medium-rangedYukawa fluid. Proposed theory keeps the same level of simplicity andtransparency, as the conventional FMSA/HS approach does, but shows to be moreaccurate.

Improved first order mean spherical approximation for simple fluids