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The calculation, first attempted by Kabir and Salpeter, of the mean excitation energy entering in the Lamb shift of the helium ground state is redone by a quite different approach. Our answer, lnk₀{rₘ}=4. 3700. 004, leaves theory and experiment on the ionization energy of helium in agreement within the experimental uncertainty of 0. 15 cm^-1. Incidental results are given for the electrostatic polarizability of He and H^- ground states and there is appended a new discussion of the construction of higher angular momentum eigenfunctions for the three-body problem.
Charles Schwartz (Fri,) studied this question.