Outer-shell photodetachment of Li⁻ near inner-shell thresholds

Abstract

The effect of inner-shell photodetachment channels on outer-shell photodetachment is investigated using the R-matrix method. The simplest multishell closed-shell negative ion, Li−, is examined near the 1s detachment threshold and the results show that the interchannel coupling significantly alters the shapes and magnitudes of the valence photodetachment cross sections in this energy region.

Inner-Shell Photodetachment of Na− Using R-Matrix Methods

“…This occurs because in the negative ion, the 2p 5 3s 2 ns excitation lies above the 2p 5 3s 2 threshold. This is similar to what was found recently in Li − [30]. This resonance has both shape and Feshbach characteristics, which demonstrates how different negative ions are compared to their neutral atom counterparts; even the language of neutral atoms is inadequate to describe certain negative ion phenomena.…”