Radiative rates for E1, E2, M1, and M2 transitions in the Br-like ions Sr IV, Y V, Zr VI, Nb VII, and Mo VIII

TL;DR

This paper reports detailed energy levels, lifetimes, and radiative transition rates for five Br-like ions, using extensive configuration interaction and relativistic calculations, providing data valuable for plasma modeling and spectroscopic analysis.

Contribution

It provides the first comprehensive set of energies, lifetimes, and radiative rates for these ions, including extensive configuration interaction and relativistic effects, with improved accuracy assessments.

Findings

Most energy levels are accurate within 2%

Radiative rates are provided for all E1, E2, M1, M2 transitions

Discrepancies with experimental data are up to 6% for some levels

Abstract

Energies and lifetimes are reported for the lowest 375 levels of five Br-like ions, namely Sr~IV, Y~V, Zr~VI, Nb~VII, and Mo~VIII, mostly belonging to the 4s$^2$4p$^5$, 4s$^2$4p$^4$4$\ell$, 4s4p$^6$, 4s$^2$4p$^4$5$\ell$, 4s$^2$4p$^3$4d$^2$, 4s4p$^5$4$\ell$, and 4s4p$^5$5$\ell$ configurations. Extensive configuration interaction has been included and the general-purpose relativistic atomic structure package ({\sc grasp}) has been adopted for the calculations. Additionally, radiative rates are listed among these levels for all E1, E2, M1, and M2 transitions. From a comparison with the measurements, the majority of our energy levels are assessed to be accurate to better than 2\%, although discrepancies between theory and experiment for a few are up to 6\%. An accuracy assessment of the calculated radiative rates (and lifetimes) is more difficult, because no prior results exist for these ions.