Electronic isotope shift factors for the Ir $5d^{7}6s^{2} \ ^{4}\!F_{9/2} \to (\mbox{odd},J= 9/2)$ line at 247.587 nm

TL;DR

This paper provides detailed theoretical calculations of isotope shift factors for a specific iridium spectral line, aiding the extraction of nuclear properties from isotope shift measurements.

Contribution

It introduces relativistic multiconfiguration calculations of isotope shift factors for the Ir 247.587 nm line, improving nuclear structure analysis.

Findings

Calculated isotope shift factors agree with experimental data.

Enhanced understanding of nuclear deformations in iridium isotopes.

Validated computational methods for atomic structure analysis.

Abstract

We present the theoretical calculations of the electronic isotope shift factors of the $5d^{7}6s^{2} \ ^{4}\!F_{9/2} \to (\mbox{odd},J= 9/2)$ line at 247.587 nm, that were recently used to extract nuclear mean square radii and nuclear deformations of iridium isotopes [Mukai $\textit{et al.}$ (2020)]. The fully relativistic multiconfiguration Dirac-Hartree-Fock method and the relativistic configuration interaction method were used to perform the atomic structure calculations. Additional properties such as the $\textit{sharing rule}$, Land\'e $g$ factors or $\textit{phase tracking}$ were employed to ensure an adequate description of the targeted odd level.