Transition probabilities, oscillator strengths and lifetimes for singly ionized magnesium

The electric dipole transition probabilities, oscillator strengths and lifetimes have been calculated using the weakest bound electron potential model theory (WBEPMT) for singly ionized magnesium. In the calculations both multiplet and fine structure transitions are studied. We have employed both the numerical Coulomb approximation (NCA) method and numerical non-relativistic Hartree–Fock (NRHF) wave functions for expectation values of radii. The calculated oscillator strengths and lifetimes have been compared with MCHF results given by Fischer et al. (2006). A good agreement has been obtained with the MCHF results. Moreover, some new transition probabilities, oscillator strengths and lifetime values, not existing in the data bases for highly excited levels in singly ionized magnesium, have been obtained using this method. ► Mg II abundance is needed for determination of the continuous opacity in stellar models. ► Absolute oscillator strengths of Mg II are of astrophysical importance. ► In the calculations both multiplet and fine structure transitions are studied. ► We have employed both NCA and NRHF wave functions for expected values of radii. ► Our results show that the WBEPM theory is advantageous for high lying states of Mg II.