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Title: CO (a{sup 3}Π) quenching at a metal surface: Evidence of an electron transfer mediated mechanism

We observe a strong influence of molecular vibration and surface temperature on electron emission promoted by the de-excitation of metastable CO(a{sup 3}Π) on a clean Au(111) surface using a molecular beam surface scattering apparatus. The de-excitation is independent of incidence translational energy. These observations appear incompatible with existing theories of metastable particle de-excitation on metal surfaces, which are based on the Auger effect. Instead, they strongly suggest a mechanism involving formation of a transient anion whose lifetime is similar to the vibrational period of the CO molecule.
Authors:
 [1] ;  [2] ;  [2] ; ; ; ;  [1] ;  [2] ;  [3]
  1. Max-Planck-Institut Für Biophysikalische Chemie, Karl Friedrich-Bonhoeffer-Institut, Am Fassberg 11, 37077 Göttingen (Germany)
  2. (Germany)
  3. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Abteilung Molekülphysik, Faradayweg 4-6, 14195 Berlin (Germany)
Publication Date:
OSTI Identifier:
22419959
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; AUGER EFFECT; CARBON MONOXIDE; DE-EXCITATION; ELECTRON EMISSION; METALS; MOLECULAR BEAMS; MOLECULES; PARTICLES; QUENCHING; SCATTERING; SURFACES