Phys. Rev. A 60, 2792 - 2798 (1999)Higher-order recoil corrections to energy levels of two-body systems
Krzysztof Pachucki1 * and Savely G. Karshenboim2 † Received 9 April 1999 We have calculated a correction of order m α7 ln2 α 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
* Electronic address: krp@fuw.edu.pl
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