Calculation of quasi-degenerate energy levels of two-electron ions
O. Yu. Andreev, L. N. Labzowsky, G. Plunien, G. Soff
Abstract
Accurate QED calculations of the interelectron interaction corrections for the (1s2p)2 1 P1, (1s2p)2 3 P1 two-electron configurations for ions with nuclear charge numbers 10 Z 92 are performed within the line profile approach. Total energies of these configurations are evaluated. Employing the fully relativistic treatment based on the j--j coupling scheme these energy levels become quasi-degenerate in the region Z 40. To treat such states within the framework of QED we utilize the line profile approach. The calculations are performed within the Coulomb gauge.
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