Inner-shell photodetachment from Se$^{-}$

POSTER

Abstract

The photodetachment spectrum of Se$^{-}$ from 50 - 62 eV 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. Se$^{+ }$and$^{ }$Se$^{++}$ ions formed by double and triple 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 $electrons lead to three resonance structures. The resonances are observed in both the Se$^{+ }$and$^{ }$Se$^{++}$ decay channels bound by several eV below the 3$d$ detachment threshold near 54 eV.

*This material is based on work supported by the National Science Foundation under Grant Nos. 0456916 and 0757976. This work is funded in part by DOE, Office of Science, BES, Chemical Sciences, Geosciences and Biosciences Divisions.

Authors

  • N.D. Gibson

    • Dept. of Physics, Denison University, Granville, OH 43023

  • C.W. Walter

  • R.L. Field III

  • D.J. Carman

  • J.Z. Shapiro

    • Denison University

  • R.C. Bilodeau

  • I. Dumitriu

  • N. Berrah

    • Western Michigan Univ.

  • A. Aguilar

    • Advanced Light Source, LBL