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Two-loop Bethe logarithms for non-Slevels

2006
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Physical Review A. Atomic, Molecular, and Optical Physics
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Two-loop Bethe logarithms are calculated for excited P and D states in hydrogenlike systems, and estimates are presented for all states with higher angular momenta. These results complete our knowledge of the P and D energy levels in hydrogen at the order of alpha^8 m_e c^2, where m_e is the electron mass and c is the speed of light, and scale as Z^6, where Z is the nuclear charge number. Our analytic and numerical calculations are consistent with the complete absence of logarithmic terms of

doi:10.1103/physreva.74.062517
fatcat:gdmhz7lv4zgftjuhfvjpbbwopi