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- W2034231746 abstract "We analyze models for two intersecting electronic states coupled by one nuclear coordinate. The corresponding model-Hamiltonians depend on a perturbation parameter ensuremath{alpha}. Its variation allows us to switch on the nonadiabatic coupling continuously. We derive analytical expressions for the eigenstates and energies as function of ensuremath{alpha} in the diabatic representation. We rederive the expression for the energy eigenvalues by complete resummation of the Brillouin-Wigner perturbation series in the Born-Oppenheimer basis. We find that the divergences of the nonadiabatic coupling cancel strictly order by order. The admixture of high energy components is shown explicitly." @default.
- W2034231746 created "2016-06-24" @default.
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- W2034231746 date "2001-03-20" @default.
- W2034231746 modified "2023-09-26" @default.
- W2034231746 title "Infinite-order non-Born-Oppenheimer perturbation theory for systems with intersecting potentials" @default.
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- W2034231746 doi "https://doi.org/10.1103/physreva.63.042510" @default.
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