The problems of taking account of interactions in the statistical theory of ion-molecular systems are considered. The procedure proposed is based on dividing the interparticle potential into three parts: a short-range repulsion, a strong intermediate-range attraction, and long-range electrostatic interactions. Optimized cluster expansions of the correlation functions are proposed. Various types of models describing an ion-molecular system are studied: multipole models, site-site ones, associative ones, realistic models that using computer simulation of the reference system. The problems of description of spatially inhomogeneous ion-molecular systems are discussed.
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