Analysis of the Contributions to the Kinetic and Potential Energies of an H Atom in the Presence of a Point Charge: The Molecular Virial Theorem Revisited.
J Phys Chem A
; 124(22): 4534-4538, 2020 Jun 04.
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| ID: mdl-32368912
ABSTRACT
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 U is the interaction energy and R is the internuclear separation or the atom-point charge separation. In this paper we directly evaluate the ⟨T⟩ and ⟨V⟩ 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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