Accounting for highly excited states in detailed opacity calculations

TL;DR

This paper introduces a new modeling approach for accounting for highly excited Rydberg states in opacity calculations, improving the accuracy of spectral line broadening predictions in ion plasmas.

Contribution

It proposes a partial detailed-line-accounting method incorporating Rydberg spectator effects via shifts and widths based on partition functions, compatible with existing opacity codes.

Findings

Enhanced modeling of satellite lines in X-ray spectra.

Improved accuracy in opacity calculations for multiply-charged ions.

Method adaptable to various detailed-configuration opacity codes.

Abstract

In multiply-charged ion plasmas, a significant number of electrons may occupy high-energy orbitals. These "Rydberg" electrons, when they act as spectators, are responsible for a number of satellites of X-ray absorption or emission lines, yielding a broadening of the red wing of the resonance lines. The contribution of such satellite lines may be important, because of the high degeneracy of the relevant excited configurations which give these large Boltzmann weights. However, it is in general difficult to take these configurations into account since they are likely to give rise to a large number of lines. We propose to model the perturbation induced by the spectators in a way similar to the Partially-Resolved-Transition-Array approach recently published by C. Iglesias. It consists in a partial detailed-line-accounting calculation in which the effect of the Rydberg spectators is included through a shift and width, expressed in terms of the canonical partition functions, which are key-ingredients of the Super-Transition-Arrays model. The resulting method can a priori be used in any detailed-configuration/line-accounting opacity code.