Nonmonotonic behavior as a function of nuclear charge of the K-shell Auger and radiative rates and fluorescence yields along the 1s2s(2)2p(3) isoelectronic sequence

Hasoglu, M.F. and Nikolic, D. and Gorczyca, T.W. and Manson, S.T. and Chen, M.H. and Badnell, N.R. (2008) Nonmonotonic behavior as a function of nuclear charge of the K-shell Auger and radiative rates and fluorescence yields along the 1s2s(2)2p(3) isoelectronic sequence. Physical Review A, 78 (3). 032509-1-032509-6. ISSN 1094-1622

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Abstract

Calculations using multiconfiguration Breit-Pauli and multiconfiguration Dirac-Fock methodologies have revealed that the radiative and Auger rates, and the associated fluorescence yields, of the six electron 1s2s(2)2p(3) K-shell vacancy isoelectronic sequence exhibit nonmonotonic behavior as a function of nuclear charge Z. This behavior is explained in terms of an accidental degeneracy, an avoided crossing of two nearly degenerate spin-orbit coupled levels. The results also demonstrate the importance of including both electron-electron correlation and spin-orbit effects even at low Z.