Comprehensive calculations of energy levels, radiative transition parameters, hyperfine structure constants A$_J$-B$_J$, Land\'e g$_J$ factors and isotope shifts for Sc XX

TL;DR

This paper presents comprehensive relativistic calculations of energy levels, transition parameters, hyperfine constants, Landé g-factors, and isotope shifts for He-like scandium (Sc XX), including QED and nuclear effects, with many results reported for the first time.

Contribution

The study provides the first extensive set of calculations for multiple atomic parameters of Sc XX, incorporating advanced relativistic and QED corrections, and compares well with existing data.

Findings

Excellent agreement with NIST data and other theories.

Many results reported for the first time.

Includes detailed hyperfine and isotope shift data.

Abstract

Large scale calculations for the energy levels, transition rates, oscillator strengths, hyperfine interaction constants, Land\'e g$_J$ factors and isotope shifts have been performed for $1s^2$ and $1snl \: (n=2-8 $ and $l \leq (n-1) )$ levels of He-like scandium, Sc XX. The GRASP2018 package based on the multi-configurational Dirac-Fock method is used to perform these calculations. The leading quantum electrodynamics corrections, Breit interactions and nuclear recoil effects are also included in the succeeding relativistic configuration interaction calculations. The relativistic isotope shift (RIS4) program is used to determine the mass and field shifts factors. A detailed comparison of the present results with the corresponding values from the NIST database and other theoretical work, wherever available, has been done, and an excellent agreement is achieved. A large section of the results is reported for the first time in the present work.