The relative influence of many body and molecular motion effects for near-threshold N K x-ray emission spectra in ionic nitrogen insulating compounds

ORAL

Abstract

Our previous studies of the factors affecting the N K x-ray emission spectra of ammonium chloride and ammonium nitrate have revealed the importance of many body effects and molecular motion at an excitation energy well above the K edge. Quasiparticle lifetimes of the valence bands and zero point motion of the molecular groups have proven to be unusually significant. Large changes are observed experimentally in the x-ray emission spectra of these compounds as the excitation energy is progressively lowered towards threshold. We compare experimental results with initial calculations of the spectra including excitonic effects, self-energy contributions, and molecular motion.

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Authors

  • T. Jach

    • NIST, Gaithersburg, MD
    • National Institute of Standards \& Technology, Gaithersburg, MD

  • J. Vinson

    • National Institute of Standards \& Technology, Gaithersburg, MD

  • W.T. Elam

    • Applied Physics Laboratory, University of Washington, Seattle

  • J. Denlinger

    • Advanced Light Source, Lawrence Berkeley Laboratory