Abstract
Photoionization cross sections leading to the Al 2+ 3 l states from the 1 S ground state of the Mg-like Al + have been calculated using the eigenchannel R -matrix method. The calculations have been performed in L S coupling using a configuration interaction for the target states as well as for the full atomic wave functions. The lower members of autoionizing Rydberg series converging to the Al 2+ 3 l thresholds are identified. The present calculations with good agreement between length and velocity gauges are compared with the available previous results of the Opacity Project and experimental measurements.
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