Journal of Physics B: Atomic, Molecular and Optical Physics
Relativistic formulae for the energy level shifts due to electron self-energy corrections are derived within the external potential Bethe-Salpeter formalism. A rigorous treatment of QED corrections to the fine structure splittings of helium is carried out. Although some individual self-energy diagrams give contributions of order α 6mc 2, they are shown to sum to zero. In addition, the α 6mc 2 correction from vertex modifications in the presence of Coulomb photons does not contribute. Therefore, a rigorous treatment of all QED corrections of order α 6mc 2 to the fine structure splittings of helium now appears to be complete. © 1994 IOP Publishing Ltd.
Zhang, T. and Drake, Gordon W. F.. (1994). A rigorous treatment of O(α 6mc 2) QED corrections to the fine structure splittings of helium. Journal of Physics B: Atomic, Molecular and Optical Physics, 27 (14), L311-L316.