Relativistic configuration-interaction calculation of energy levels of core-excited states in lithium-like ions: argon through krypton

TL;DR

This paper presents a comprehensive relativistic configuration-interaction calculation of energy levels for core-excited states in lithium-like ions from argon to krypton, including QED and Breit corrections, with error estimates.

Contribution

It introduces a consistent approach for calculating all n=2 core-excited states in lithium-like ions across a range of atomic numbers, incorporating advanced corrections.

Findings

Accurate energy levels for lithium-like ions from Ar to Kr.

Quantitative estimates of calculation uncertainties.

Inclusion of QED, recoil, and Breit effects in the model.

Abstract

Large-scale relativistic configuration-interaction calculation of energy levels of core-excited states of lithium-like ions is presented. Quantum electrodynamic, nuclear recoil, and frequency-dependent Breit corrections are included in the calculation. The approach is consistently applied for calculating all $n=2$ core-excited states for all lithium-like ions starting from argon ($Z = 18$) and ending with krypton ($Z = 36$). The results obtained are supplemented with systematical estimations of calculation errors and omitted effects.