Quantum electrodynamic corrections in high-Z Li-like and Be-like ions - art. no. 054501

Relativistic configuration-interaction (RCI) calculations of the correlatio n energies of the 2s-2p(3/2) and the 2s(2) S-1(0) - 2s2p P-1(1) transitions in high-Z Li-like and Be-like ions, respectively, are reexamined. Experime ntal quantum electrodynamic (QED) corrections are obtained by subtracting R CI correlation energies from high-precision x-ray energy measurements, It i s found that our QED results are in good agreement with experiment and that screening and relaxation corrections are well accounted for by the use of the Dirac-Kohn-Sham potentials in QED calculations of the one-loop radiativ e diagrams. Our present QED energies are also in good agreement with recent higher-order QED calculations of the 2s-2p(1/2) transition in high-Z Li-li ke ions.