Energy levels, radiative rates and lifetimes for transitions in Br-like ions with 38 $\le$ Z $\le$ 42

TL;DR

This study calculates energy levels, radiative rates, and lifetimes for transitions in five Br-like ions with atomic numbers 38 to 42 using the GRASP code, providing extensive data and highlighting discrepancies with previous theoretical results.

Contribution

The paper presents new, comprehensive calculations of atomic data for specific Br-like ions, including energy levels and radiative rates, with detailed configuration interaction effects.

Findings

Calculated energy levels and radiative rates for five Br-like ions.

Discrepancies found between current results and previous theoretical data.

Lifetimes determined but lack experimental validation.

Abstract

Energy levels and radiative rates for transitions in five Br-like ions (Sr IV, Y V, Zr VI, Nb VII and Mo VIII) are calculated with the general-purpose relativistic atomic structure package ({\sc grasp}). Extensive configuration interaction has been included and results are presented among the lowest 31 levels of the 4s$^2$4p$^5$, 4s$^2$4p$^4$4d and 4s4p$^6$ configurations. Lifetimes for these levels have also been determined, although unfortunately no measurements are available with which to compare. However, recently theoretical results have been reported by Singh {\em et al} [Phys. Scr. {\bf 88} (2013) 035301] using the same {\sc grasp} code. But their reported data for radiative rates and lifetimes cannot be reproduced and show discrepancies of up to five orders of magnitude with the present calculations.