Interaction Second Virial Coefficients of Non-spherical Molecules

Abstract

A revised analysis of the effect of long-range non-spherical terms in the intermolecular potential on the interaction second virial coefficient is presented with a preferred realistic potential functions-proposed for the molecular gases and their mixtures of noble gases-for spherical core treatment of integration in the small regions of intermolecular distances. The paper presents a contribution to the interaction second virial coefficient due to the asphericity of the molecular charge distribution. Results from calculating the non-spherical contribution to the interaction second virial coefficient with a realistic spherical core are obtained from statistical mechanics and applied to the pure system such as O₂-O₂ and H₂-H₂ and mixtures such as N2 + He, N2 + Ar, O₂ + He, O₂ + He, O₂ + Ar, H₂ + He, H₂ + Ne, H₂ + Ar and H₂ + Kr.