Erosion of Pure and Alloyed Ices of Rare Gases and Small Molecules by Core Excitation

  • R. Scheuerer
  • P. Feulner
  • G. Rocker
  • Zhu Lin
  • D. Menzel
Conference paper
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 19)

Abstract

Because of their fundamental interest, electronic sputtering processes of Van-der-Waals bound solids have been investigated by many researchers /1/. Most of these studies dealt with pure solids of only one component, though for a variety of applications (e.g. space science or cryogenic devices) the investigation of electronically stimulated reactions and erosion of alloys might be even more important. Moreover, studies of such layers could shed light on the mechanisms by which the electronic excitation is transferred to nuclear motion, especially if resonant excitation by monochromatic photons from synchrotron sources is investigated. Tuning the wavelength to a suitable absorption line makes the localisation of the primary excitation on selected constituents of the “mixed ice” possible. We have therefore investigated total electron yield (TEY), and neutral and ionic photon stimulated desorption yields (n-PSD, i-PSD) of pure and mixed ice layers of Ar, O2, CO, and H2. Erosion of Ar has been studied before by desorption and luminescence spectroscopy and the prevailing sputtering mechanisms for valence excitation are well understood (see, e.g., ref.2 and references therein). O2 and CO are interesting candidates because the sputtering mechanisms seem to be different in the two cases. For O2, a high relaxation energy of up to 7 eV due to dissociative recombination of the molecular ion is expected to be the main “power source” for desorption /3/.

Keywords

Enthalpy Recombination Auger 

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1990

Authors and Affiliations

  • R. Scheuerer
    • 1
  • P. Feulner
    • 1
  • G. Rocker
    • 1
  • Zhu Lin
    • 1
  • D. Menzel
    • 1
  1. 1.Physik-Department E20Technische Universität MünchenGarchingFed. Rep. of Germany

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