Relaxation and polarization effects in photodetachment of the negative iodide ion

Abstract

Photodetachment cross sections have been calculated for the $5p,$ $4d,$ and $4p$ subshells of the negative iodide ion, ${\mathrm{I}}^{\ensuremath{-}},$ in the relativistic random-phase approximation (RRPA) and modifications of the RRPA that allow for the inclusion of relaxation and core-polarization effects. Total and partial photodetachment cross sections are compared with experimental measurements to gauge the effectiveness of the various approximations. Branching ratios and photoelectron angular-distribution asymmetry parameters are also presented. Core-polarization effects are found to partially cancel relaxation effects.