Stabilization method with Relativistic Configuration-interaction applied to two-electron resonances

TL;DR

This paper introduces a relativistic configuration-interaction stabilization method to accurately determine autoionization resonances in heliumlike ions, including heavy ions like uranium, under extreme conditions.

Contribution

The paper presents a novel relativistic CI-based stabilization approach for calculating autoionization resonances, applicable to heavy ions and extreme pressure environments.

Findings

Successfully applied to helium atom resonances with benchmark comparison

Extended to heliumlike uranium, demonstrating relativistic effects

Potential for simulating ions in dense plasma environments

Abstract

We applied a relativistic configuration-interaction (CI) framework to the stabilization method as an approach for obtaining the autoionization resonance structure of heliumlike ions. In this method, the ion is confined within an impenetrable spherical cavity, the size of which determines the radial space available for electron wavefunctions and electron-electron interactions. By varying the size of the cavity, one can obtain the autoionization resonance position and width. The applicability of this method is tested on the resonances of He atom while comparing with benchmark data available in the literature. The present method is further applied to the determination of the resonance structure of heliumlike uranium ion, where a relativistic framework is mandatory. In the strong-confinement region, the present method can be useful to simulate the properties of an atom or ion under extreme pressure. An exemplary application of the present method to determine the structure of ions embedded in a dense plasma environment is briefly discussed.