Energy-crossings and their effects on the spectra of the neon-like ions

摘要

Excitation energies, transition wavelengths and probabilities of the 2p^6, 2p^5 3/, 2s2p^6 31 (l = 0, 1, 2) states along the Ne-like isoelectronic sequence from Z = 21 - 92 have been calculated by using the multi-configuration Dirac-Fock (MCDF) package GRASP92 and a newly developed radiative transition program REOS99. In the calculations, the correlation and relaxation effects are included systematically. Based on the calculations, all possible energy crossings among the level groups with the same parity and total angular momentum have been presented. It is found that there are strong configuration interactions in some particular Z regions with energy-crossings, which can cause a dramatic change of the related transition probabilities.