# Relativistic calculations of the ground and inner-L-shell excited energy levels of berylliumlike ions

## TL;DR

This paper presents comprehensive relativistic calculations of energy levels for berylliumlike ions across a wide atomic number range, incorporating quantum electrodynamics and other corrections for high accuracy.

## Contribution

It introduces a large-scale relativistic configuration-interaction combined with many-body perturbation theory for precise energy level calculations of berylliumlike ions.

## Key findings

- Accurate energy levels for ions with Z=10 to Z=92.
- Quantified uncertainties in the calculations.
- Included QED, recoil, and Breit corrections.

## Abstract

Large-scale relativistic configuration-interaction method combined with many-body perturbation theory is consistently applied to calculations of the energy levels of the ground and inner-L-shell excited states of berylliumlike ions in the range $10 \leq Z \leq 92$. The quantum electrodynamics, nuclear recoil, and frequency-dependent Breit corrections are taken into account. The obtained results are supplemented with the systematical estimation of the uncertainties.