Abstract
The multiconfiguration relativistic random-phase approximation theory (MCRRPA) is applied to the photoionization processes of Mg. Double-electron excitations as well as core-electron excitations are included. The core-electron excitations account for the core-valence correlations, specifically the core-polarization effects, and the double-electron excitations account for the intravalence correlations. We obtain a prediction of the ${3s}_{1/2}$ threshold photoionization cross section that is in excellent agreement with experiment. It shows that the core-polarization effects in addition to the double-electron excitations play an important role in the near- threshold photoionization processes of Mg and the MCRRPA provides an accurate account of these effects.
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