Abstract
Second-order perturbation theory is developed for equations of the Klein-Gordon typeK(E, V, ∇2) Ψ=0, in which the eigenvalueE occurs in various powers. The result is a simple generalization of Schrödinger's.
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Decker, R., Pilkuhn, H. & Schlageter, A. Stationary perturbation theory for non-Hamiltonian eigenvalue equations. Z Phys D - Atoms, Molecules and Clusters 6, 1–3 (1987). https://doi.org/10.1007/BF01436988
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DOI: https://doi.org/10.1007/BF01436988