Nonadditive Interactions between Molecules in a Statistical Treatment of Dilute Gases

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Abstract
A dilute gas is treated by the method of diagrammatic perturbation expansion for a system of electrons and nuclei. A reinterpretation of the diagrams in terms of interacting molecules leads to their re-expression as functionals of intramolecular particle correlation functions. The first-order diagrams depend on the single-electron and electron-pair distributions in the molecule.