Calculation of quasi-degenerate energy levels of two-electron ions

O. Yu. Andreev, L. N. Labzowsky, G. Plunien +1

Accurate QED calculations of the interelectron interaction corrections for the $(1s2p)2{}^1{P}_1$, $(1s2p)2{}^3{P}_1$ two-electron configurations for ions with nuclear charge numbe…