Excited-state 1s-2pabsorption by aluminum ions with partially filledLshells

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Abstract
The purpose of this paper is to quantify the role of initial configurations that have an electron beyond the L shell in 1s-2p absorption of aluminum ions. The study is done in the context of a recent x-ray transmission experiment and is based on a theoretical model that is in good agreement with the measurements. In addition, the method of Epstein will be used to study the temperature-dependent effect of excited states on the cross section for the individual ions. Results indicate that about 50% of the absorption is due to initial configurations that have an excited electron beyond the L shell, and the overall opacity of the 1s-2p manifold of transitions can be enhanced by these configurations at elevated temperatures for some ion species.