Near-threshold behavior of angular anisotropy parameters in negative-ion photodetachment

We have investigated the near-threshold behavior of the dipole and nondipole angular anisotropy parameters in photodetachment of the negative ion ${\mathrm{I}}^{\ensuremath{-}}$ by performing both analytical and numerical calculations. The numerical calculations of the angular asymmetry parameters were carried out both in the one-electron Hartree-Fock (HF) approximation and with account of the many-electron correlations within the framework of the random phase approximation with exchange (RPAE). The calculated results are presented for the outer and intermediate subshells of the iodine negative ion ${\mathrm{I}}^{\ensuremath{-}}$ and contrasted with those of the neutral neighbor atom Xe. Essential differences in the HF and RPAE near-threshold behavior of the angular distribution parameters between the negative ion and the neutral atom are demonstrated.

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