Phys. Rev. A 60, 2792–2798 (1999)Higher-order recoil corrections to energy levels of two-body systemsReceived 9 April 1999; published in the issue dated October 1999 We have calculated a correction of order mα7ln2α to energy levels of the general two-body system of spin-1/2 particles with arbitrary masses. The result allows for the improved theoretical predictions of the 1S-2S and 2S-2P intervals in positronium. Further implications to the hydrogen-deuterium 1S-2S isotope shift are discussed also. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.60.2792
DOI:
10.1103/PhysRevA.60.2792
PACS:
36.10.Dr, 12.20.Ds, 31.30.Jv, 31.30.Gs
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