Phys. Rev. 109, 1854–1855 (1958)Perturbation Theory in Wave MechanicsReceived 24 October 1957; published in the issue dated March 1958 This note is intended to supplement a recent article by Speisman by focusing attention on some points of a rather practical nature. In particular, it is shown that the method of Dalgarno and Lewis arises naturally as a special case of the present scheme, and that an upper bound to the energy can be obtained almost immediately once the results of the Rayleigh-Schrödinger theory are known to third order. © 1958 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRev.109.1854
DOI:
10.1103/PhysRev.109.1854
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