Rydberg states of helium: A new recoil term

Abstract
The mass-polarization shift in the energy levels of 1sNL states of helium contains a term of second order in the ratio of the electron mass to that of the nucleus that is independent of L. Although inherent in an earlier work [Phys. Rev. A 33, 2780 (1986)], it was not pointed out there since only L-dependent splittings were of interest. The derivation is very simple and yields a correction of significance for the calculation of absolute ionization energies.

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