Second spectrum of Chromium (Cr II), Part II: Radiative lifetimes and oscillator strengths of transitions depopulating low lying 3d[formula omitted]4p levels

Abstract

Radiative lifetime and oscillator strength values were computed by means of a pseudo-relativistic Hartree–Fock model including core-polarization and compared successfully with experimental data given in the literature for respectively numerous low-lying Cr II 3d44p levels, up to 54784 cm−1, and transitions depopulating these levels. Then transition probability and branching fraction data were also deduced in the wavelength range 1825–94400 Å. Furthermore the extracted radial integral values, obtained with the help of the oscillator strength parameterization method, are given for involved transitions in this work, i.e. 3d44s–3d44p, 3d5–3d44p and 3d44p–3d44d. We confirm our observed previous general trends, noting once again a decreasing of transition radial integral values with filling nd shells of the same principal quantum numbers for ndk(n+1)s →ndk(n+1)p transitions.