Abstract
The photoionization cross sections of the ground level (3s2 1S0) of atomic Mg have been studied theoretically in the energy region between the Mg+(3s) and Mg+(3p) threshold using the fully relativistic R-matrix method. The positions and widths of resonances have also been obtained and compared with a recent experiment (Wehlitz et al 2007 J. Phys. B 40 2385). Excellent agreement is shown between our theoretical calculations and experimental measurements. In the present calculations, five Rydberg series of doubly excited states have been exhibited, i.e. 3pns 1P, 3pnd 1P, 3pns 3P, 3pnd 3D and 3pnd 3P, where 3pnd 3P are confirmed as the fifth series in contrast to the previous theoretical results.
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