Dielectronic recombination studies on Fe$^{2+}$

TL;DR

This study performs fully relativistic calculations of dielectronic recombination parameters for Fe$^{2+}$ ions, improving accuracy and consistency with experimental data, which is vital for astrophysical and plasma physics applications.

Contribution

The paper introduces comprehensive relativistic calculations of dielectronic recombination for Fe$^{2+}$, enhancing previous theoretical models with improved energy level and resonance data.

Findings

Calculated level energies align well with experimental data.

Resonance strengths and cross sections are provided with improved accuracy.

Results are relevant for astrophysical and plasma physics phenomena.

Abstract

Dielectronic recombination resonance strengths, energy-differential cross sections, and recombination rate coefficients are calculated fully relativistically for Fe$^{2+}$ ions. The ground-state and resonance energies are determined using the multiconfiguration Dirac-Hartree-Fock method. Radiative and auto-ionization rates are computed with a relativistic configuration interaction method. For the calculation of Auger widths and resonance strengths, the continuum electron is treated within the framework of the relativistic distorted-wave model. Notably, the calculated level energies for Fe$^{2+}$ not only align well with experimental results but also show improvements compared to earlier theoretical studies. These fully relativistic calculations provide a more accurate and comprehensive understanding of the recombination process. This is particularly important in astrophysics and plasma physics, especially for studying phenomena such as kilonova events.