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

Excitation energies, transition wavelengths and probabilities of the 2p⁶, 2p⁵ 3l, 2s 2p⁶ 3l (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 package GRASP92 and a newly developing 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 angle momentum have been presented. It is found that there are strong conˉguration interactions in some particular Z regions with energy-crossings, and which can cause a dramatic change of the related transition probabilities.