The molecular virial theorem states that for a diatomic molecule or for an atom in the presence of a point charge, the changes in the average kinetic energy and average potential energy are equal to [Formula: see text] and [Formula: see text], respectively, where is the interaction energy and is the internuclear separation or the atom-point charge separation. In this paper we directly evaluate the ⟨⟩ and ⟨⟩ expectation values of an H atom in the presence of a distant point charge, obtaining exact analytical expressions by use of Dalgarno-Lewis perturbation theory.
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