Revised transition probabilities for Fe XXV: Relativistic CI calculations

Abstract

Revised data are provided for transition probabilities between fine-structure components of levels with n ⩽ 6 in Fe XXV. Earlier published data for transitions between fine-structure levels in Fe XXV are found to be in error, especially for certain classes of transitions. The purpose of the present note is to provide a corrected database for transitions in Fe XXV. Wavefunctions and energies for states with n ⩽ 6 and J = 0, 1, 2, 3 are determined using a relativistic configuration interaction (CI) expansion that includes the Breit interaction. To measure and control the numerical accuracy of the calculations, we compare our CI energies and matrix elements with values calculated using relativistic second-order many-body perturbation theory (MBPT), also including the Breit interaction. We obtain good agreement between our CI and MBPT calculations but disagree with earlier calculations for transitions with Δ L = 2 and for intercombination transitions (Δ S = 1). We provide wavelengths, line strengths, and transitions rates for fine-structure transition between levels with n ⩽ 6 in Fe XXV.