On the status of the Born-Oppenheimer expansion in molecular systems theory
classification
❄️ cond-mat.stat-mech
cond-mat.quant-gasquant-ph
keywords
born-oppenheimerexpansiontheorymolecularperturbationsystemsadiabaticapplicability
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It is shown that the adiabatic Born-Oppenheimer expansion does not satisfy the necessary condition for the applicability of perturbation theory. A simple example of an exact solution of a problem that can not be obtained from the Born-Oppenheimer expansion is given. A new version of perturbation theory for molecular systems is proposed.
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