Fine-structure splitting and magnetic dipole and electric quadrupole transition probabilities between the ground levels of Ga-like ions

Abstract

The fine-structure splitting in the ground term (4s24p 2P) of Ga-like ions and magnetic dipole (M1) and electric quadrupole (E2) transition rates between the 2P1/2 and 2P3/2 levels have been calculated for Ga to U61 + using the multiconfiguration Dirac-Fock (MCDF) method with jj configurations arising from the (n = 4)3 relativistic Coulomb complex. The Breit interaction and the Lamb shift corrections were also included. Our theoretical results are compared with experimental and semiempirical finestructure splittings and theoretical transition rates available in the literature. We find that for highly charged ions, relativistic configurations that include the 4d and 4f orbitals such as 4d24p, 4f24p, 4s4d4f etc. (see text) are not needed to obtain accurate results for the fine-structure splitting in agreement with the recent relativistic extension of the Z-expansion theory by Weiss and Kim.