Inner-shell photodetachment from Se$^{-}$
POSTER
Abstract
The photodetachment spectrum of Se$^{-}$ has been investigated using the merged ion-photon beam photodetachment technique. Se$^{-}$ ions were produced in a Cs sputtered negative ion source (SNICS II) while the photons were produced by the undulator on the Advanced Light Source Ion-Photon Beamline 10.0.1. Positive Se ions formed by multiple detachment were detected as a function of photon energy. Correlations in short-lived negative ion resonances formed by completely filling the valence 4$p$ shell in Se$^{-}$ by photoexcitation of 3$d $electrons lead to three resonance structures above 50 eV. The 3$p $threshold is observed above 156 eV and multielectron detachment resonance structure is observed near the 3$s$ photodetachment threshold above 220 eV. Comparisons to inner-shell detachment from S$^{-}$ and Te$^{-}$ are discussed.
*This material is based on work supported by the National Science Foundation under Grant No. 0757976, funded in part by DOE, Office of Science, BES, Chemical Sciences, Geosciences and Biosciences Divisions and the Swedish Research Council.