Relativistic configuration-interaction calculation of $K\alpha$ transition energies in beryllium-like argon

TL;DR

This paper presents relativistic configuration-interaction calculations of $K ext{α}$ transition energies in beryllium-like argon, incorporating QED effects and uncertainty estimates to improve theoretical accuracy.

Contribution

It introduces a comprehensive method combining relativistic CI calculations with two approaches for QED effects and systematic uncertainty estimation.

Findings

Calculated $K ext{α}$ transition energies with QED corrections.

Provided uncertainty estimates for theoretical predictions.

Enhanced accuracy of energy level predictions for Ar$^{14+}$.

Abstract

Relativistic configuration-interaction calculations have been performed for the energy levels of the low-lying and core-excited states of beryllium-like argon, Ar$^{14+}$. These calculations include the one-loop QED effects as obtained by two different methods, the screening-potential approach as well as the model QED operator approach. The calculations are supplemented by a systematic estimation of uncertainties of theoretical predictions.