Phys. Rev. Lett. 80, 5297–5300 (1998)Perturbed Orbital Contribution to the Two-Loop Lamb Shift in HydrogenReceived 13 February 1998; published in the issue dated 15 June 1998 A part of the two-loop Lamb shift called the perturbed orbital term is evaluated with exact Dirac-Coulomb propagators. It is shown to be the most nonperturbative function of Zα yet encountered in QED, so much so that even at Z = 1 the leading term in its Zα expansion is of the opposite sign from the complete answer. The higher order contributions are -71(1) kHz to the ground state Lamb shift in hydrogen and -8.9(1) and -346(1) kHz to the n = 2 Lamb shift in hydrogen and He+, respectively. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.5297
DOI:
10.1103/PhysRevLett.80.5297
PACS:
31.30.Jv, 12.20.Ds
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