Relativistic many-body calculation of low-energy dielectronic resonances in Be-like carbon

TL;DR

This paper develops a relativistic computational approach combining configuration-interaction, many-body perturbation theory, and complex rotation to accurately calculate low-energy dielectronic resonances in Be-like carbon, improving upon previous methods.

Contribution

The paper introduces a novel combined CI+MBPT+CRM method for calculating dielectronic resonances, demonstrating its effectiveness and accuracy for the CIII system.

Findings

The new method accurately reproduces known resonance spectra.

It demonstrates improved precision over previous calculations.

The approach is applicable to similar atomic systems.

Abstract

We apply relativistic configuration-interaction method coupled with many-body perturbation theory (CI+MBPT) to describe low-energy dielectronic recombination. We combine the CI+MBPT approach with the complex rotation method (CRM) and compute the dielectronic recombination spectrum for Li-like carbon recombining into Be-like carbon. We demonstrate the utility and evaluate the accuracy of this newly-developed CI+MBPT+CRM approach by comparing our results with the results of the previous high-precision study of the CIII system [Mannervik et al., Phys. Rev. Lett. 81, 313 (1998)].