Calculation of wavelengths and oscillator strengths for the magnesium isoelectronic sequence from I41+ to Ce46+

Abstract

The multiconfiguration Dirac–Fock method is used to systematically calculate the energy levels, wavelengths and oscillator strengths for transitions among the levels of the terms belonging to the 3s2, 3s3p, 3s3d, 3s4s, 3s4p, 3s4d, 3p2, 3p3d, 3p4s, 3p4p, 3p4d, 3d4s, 3d4p, 3d4d and 3d2 configurations for the elements of the magnesium isoelectronic sequence from high nuclear charge Z = 53 to 58 by taking into account main correlation relativistic effects. Another wavelength region λ = 6–11 Å from n = 3–4 transitions and the corresponding oscillator strengths are for the first time extensively reported. The trends of wavelengths and oscillator strengths along the isoelectronic sequence are discussed. Many strong configuration mixings and level-crossings in particular between the two states 3p3d 3F30 and 3p3d 3D30 in Mg-like La and Ce ions are investigated.