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Photophysics and Photochemistry in the Vacuum Ultraviolet pp 297–340Cite as

Superexcited and Ionic State Relaxation Processes in Vacuum Ultraviolet Excited Polyatomic Molecules

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Part of the book series: NATO ASI Series ((ASIC,volume 142))

Abstract

In certain energy regions, a molecular system can be excited to the ionization continuum (direct ion formation) and/or to excited states of the neutral species lying above the lowest ionization potential. These neutral superexcited states can decay by various processes, among which is autoionization which involves coupling with the ionization continuum (Fig. 1). In this paper, we discuss the relaxation processes of superexcited states and also of the ionic states formed by direct ionization or by autoionization. Photoabsorption of vacuum ultraviolet radiation is the principal excitation mechanism with which we will be concerned. However, it is of interest to note that superexcited states and ions can be formed as a result of interaction between neutral molecules and many different types of particles of sufficient energy namely, photons, electrons, fast atoms or molecules, atoms and molecules in metastable excited states, and charged atoms or molecules [1].

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Authors and Affiliations

  1. Université Paris-Sud, Laboratoire de Photophysique Moléculaire du CNRS, Bâtiment 213, 91405, Orsay Cédex, France

    Sydney Leach

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  1. Sydney Leach
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Editors and Affiliations

  1. Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana, USA

    S. P. McGlynn

  2. Department of Chemistry, New York University, New York, NY, USA

    G. L. Findley

  3. Argonne National Laboratory, Argonne, Illinois, USA

    R. H. Huebner

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Leach, S. (1985). Superexcited and Ionic State Relaxation Processes in Vacuum Ultraviolet Excited Polyatomic Molecules. In: McGlynn, S.P., Findley, G.L., Huebner, R.H. (eds) Photophysics and Photochemistry in the Vacuum Ultraviolet. NATO ASI Series, vol 142. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5269-0_10

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