Abstract
A graphical method is given for representing any approximation in Shrödinger's perturbation theory for the energy and wave function of a nondegenerate state; the previous approximations do not have to be formulated in detail.
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References
L. D. Landau and E. M. Lifshitz, Quantum Mechanics [in Russian], Fizmatgiz, 1963.
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Zil'berman, G.E. Graphical representation of perturbation theory for line spectra. Soviet Physics Journal 8, 81–84 (1965). https://doi.org/10.1007/BF00818293
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DOI: https://doi.org/10.1007/BF00818293