Extended calculations of energy levels, radiative properties, and lifetimes for P-like Ge XVIII

TL;DR

This paper presents extensive calculations of energy levels and radiative properties for P-like Ge XVIII using advanced relativistic methods, providing benchmark data for spectral analysis and modeling.

Contribution

The study offers a comprehensive set of transition energies and radiative data for Ge XVIII using MCDHF and RCI methods, validated with MBPT, filling a gap in accurate atomic data.

Findings

MCDHF and MBPT data are in good agreement.

The data set improves line identification accuracy.

Benchmark data for future theoretical and experimental work.

Abstract

Using the multiconfiguration Dirac-Hartree-Fock (MCDHF) and the relativistic configuration interaction (RCI) methods, a consistent set of transition energies and radiative transition data for the lowest 150 states of the $3s^2 3p^3$, $3s 3p^4$, $3s^2 3p^2 3d$, $3s 3p^3 3d$, $3p^5$, and $3s^2 3p 3d^2$ configurations in P-like Ge XVIII is provided. To assess the accuracy of the MCDHF transition energies, we have also performed calculations using the many-body perturbation theory (MBPT). Comparisons are made between the present MCDHF and MBPT data sets, as well as with other available experimental and theoretical values. The resulting accurate and consistent MCDHF data set will be useful for line identification and modeling purposes. These data can be considered as a benchmark for other calculations.