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Oxidation of Al(111) by electron impact on adsorbed H2O

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0039-6028(98)00306-9
Keywords
  • Amorphous Surfaces
  • Compound Formation
  • Electron Energy Loss Spectroscopy (Eels)
  • Electron Stimulated Desorption (Esd)
  • Growth
  • Low Index Single Crystal Surfaces
  • Oxidation
  • Secondary Electron Emission
  • Soft X-Ray Photoelectron Spectroscopy
  • Water

Abstract

Abstract The oxidation of aluminum by electron bombardment of a water-covered surface at 90 K has been investigated by XPS, EELS and high-resolution electron energy-loss spectroscopy. Electron bombardment converts the adsorbed ice layer into a disordered aluminum oxide film with very high efficiency. The cross-section for water conversion is 2.5×10 −16 cm 2 for an electron energy of 100 eV. The threshold energy of the electronic stimulation has been estimated to be 6±1 eV. The excitation probably proceeds via direct electron attachment, leading to dissociative production of an OH radical species, which is very effective for surface oxidation.

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