ON FLUIDS OF PARTICLES WITH SHORT RANGE REPULSION AND WEAK LONG RANGE ATTRACTIVE INTERACTION. II. THE TWO PARTICLE DISTRIBUTION FUNCTION.
NORTHWESTERN UNIV EVANSTON ILL DEPT OF PHYSICS
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Part I of the paper AD-672 845 presented an expansion of the pressure and density in grand canonical form and corrections to the Maxwell rule for a system of particles with short range repulsion and weak long range attraction. These expansions can be ordered in powers of gamma, the inverse range of the attractive potential. It was assumed that the thermodynamic functions and the molecular distribution functions of the reference system, i.e., the system with only the repulsive interaction, are given. In the present paper the gamma-expansion of the pair distribution function is calculated, under the same assumption. This pair distribution function vanishes, as it should, in the hard core region, if the repulsive potential has a hard core. This removes an objection against the gamma-expansion, which was stated by a previous author and would have cast doubt on the gamma-expansion in the entire range of fugacities and temperatures. Author