Statistical Mechanical Theory of Ionic Solutions Based on the Interaction Site Model: Dielectric Properties and Pair Correlation Functions

Pair correlation functions are given for fluid mixtures containing ionic species, based on the interaction site model, and the dielectric properties of the mixtures are discussed. The static dielectric function ε ( k ) is expressed in terms of site-site correlation functions. Moment conditions of site-site pair correlation functions are also derived. The correlation function expression of the dielectric screening factor is given, and the features of its behaviors are elucidated. As the simplest examples, the static dielectric functions and screening functions are calculated in the case of dilute gases.