Quantum defect orbital calculations on the alkaline-earth elements: oscillator strengths and photoionization cross sections

Abstract

The quantum defect orbital (QDO) formalism is applied to the computation of oscillator strengths of Mg, Ca, Sr, and Ba and photoionization cross sections of Mg and Ca. For [Formula: see text] transitions, QDO oscillator strengths reproduce fairly well the experimental values both in magnitude and trend. Photoionization cross sections for ns2 → nsεp transitions agree well with experimental results where no autoionization resonances are present. The results of both sets of calculations are at least comparable in quality to those of other more complex procedures.