Core polarization effects: Oscillator strengths, transition probabilities and radiative lifetimes of levels in Bi IV

Abstract In this work a systematic analysis of Bi IV atomic properties is presented. Ab initio relativistic Hartree–Fock calculations in an intermediate coupling (IC) formalism and taking into account Core Polarization Effects (CPE) are used. We use for the IC calculations the standard method of least square fitting of experimental energy levels by means of computer codes from Cowan which was modified in order to include CPE. Our calculations have been made from 17 configurations of Bi IV: 5d 10 6s 2 , 5d 10 6p 2 , 5d 10 6sns ( n = 7–10) and 5d 10 6snd ( n = 6–9) for even parity and 5d 10 6snp ( n = 6 , 7 ), 5d 10 6snf ( n = 5 , 6 ), 5d 9 6s 2 6p and 5d 9 6s 2 nf ( n = 5 , 6 ) for odd parity. Transition probabilities and oscillator strengths for 100 lines and some radiative lifetimes of Bi IV have been calculated. Besides a comparison of our results with the scarce experimental values available in the bibliography are presented. The presence of spectral lines of bismuth in stellar atmospheres has been reported in different stars. This is the motivation by this work can be very interest in astrophysical area. Recently the Bi IV is taking importance because it is considered as the main dopant in the prospective used for the design and synthesis of new scintillators.