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

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.

24 pages including 16 Tables, will appear in Physica Scripta 89 (2014)

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