Electric quadrupole transition probabilities for singly ionized magnesium

Electric quadrupole transition probabilities for Mg II have been calculated within the weakest bound electron potential model (WBEPM) theory using experimental energy levels and theoretical expectation values of orbital radii corresponding to those energy levels under the assumption of the LS coupling scheme. In this work, the WBEPM theory has been applied to forbidden transitions for the first time. The present results are consistent with earlier theoretical calculations. Some of these results are reported for the first time.

► Probabilities of E2 transitions of Mg II are important in plasma diagnostics. ► We have calculated E2 transition probabilities for some doublet levels of Mg II. ► The WBEPM theory has been applied to electric quadrupole transitions for the first time. ► Our results show that the WBEPM theory can be used for electric quadrupole transitions.