Photoionization of magnesium in the relativistic random-phase approximation

Theoretical values for atomic photoionization cross sections, angular distribution asymmetry parameters, and spin-polarization parameters for the $3s$, $2p$, and $2s$ shells of magnesium are reported. Effects of the relativistic spin-orbit interaction and the electron-electron correlations are included by the use of the relativistic random-phase approximation in this study. Several series of autoionization resonances have been analyzed by making use of the multichannel quantum-defect theory. Comparisons with previous theoretical and experimental results where available have been made.