https://doi.org/10.1140/epjd/s10053-022-00474-8
Regular Article – Atomic Physics
Relativistic Bethe logarithm for triplet states of helium-like ions
1
Peter the Great St. Petersburg Polytechnic University, Polytekhnicheskaya 29, 195251, St. Petersburg, Russia
2
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16, Prague 2, Czech Republic
3
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
Received:
12
July
2022
Accepted:
2
August
2022
Published online:
15
August
2022
We report a calculation of relativistic corrections of order 
to the Bethe logarithm for the 
and 
states of helium-like ions. The calculation is required for improving the accuracy of theoretical energies of helium-like ions and for checking the evaluation of the effects in helium performed in Patkóš et al. (Phys Rev A 103:042809, 2021), where a significant discrepancy with experimental results was found. The large-Z limit of the relativistic Bethe logarithm is determined numerically, in excellent agreement with the analytical results obtained from the hydrogen theory.
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