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Interaction of oxygen with lead-precovered nickel(100)

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
409
Issue
2
Identifiers
DOI: 10.1016/s0039-6028(98)00218-0
Keywords
  • Auger Electron Spectroscopy
  • Lead
  • Low Index Single Crystal Surface
  • Metallic Films
  • Nickel
  • Oxidation
  • Oxygen

Abstract

Abstract The interaction of oxygen with lead-precovered Ni(100) has been investigated by Auger electron spectroscopy (AES). The oxygen chemisorption capacity decays linearly with lead coverage and is completely suppressed above 0.5 lead atom per nickel atom; lead acts as an inert site blocker for the chemisorption stage. Preadsorbed lead slows down the oxidation kinetics, but does not prevent substrate oxidation; nickel oxidation occurs in the bare areas as well as under the lead deposit. For lead, the oxidation mechanism is different according to whether the atoms are in a two-dimensional configuration (submonolayer range) or in a three-dimensional one (crystallites); for crystallites, oxidation occurs from direct impingement of oxygen molecules; for a submonolayer deposit, the oxidation results from a charge transfer between the lead atoms and the underlying nickel oxide.

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