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Evidence for Eley-Rideal abstraction mechanism in reactive ion scattering of Cs+from Pt(1 1 1) adsorbed with CO and CO2

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
601
Issue
2
Identifiers
DOI: 10.1016/j.susc.2006.06.043
Keywords
  • Ion Scattering
  • Eley-Rideal Reaction
  • Carbon Monoxide
  • Carbon Dioxide
  • Platinum

Abstract

Abstract We studied the reactive ion scattering (RIS) of Cs + from a Pt(1 1 1) surface adsorbed with CO and CO 2 leading to the emission of CsCO + and CsCO 2 + . The RIS products were measured as functions of adsorbate coverage and ion incidence energy for the range of 10–60 eV. The yield and cross-section for the RIS processes were extracted from these measurements. The RIS cross-section is higher for weakly adsorbed CO 2 than for more strongly bound CO. The RIS energy-dependence shows a maximum at 15–20 eV and a decrease at higher energy. These observations provide evidence for the theoretically proposed mechanism of RIS, in which a slow Cs + picks up an adsorbate in an Eley-Rideal abstraction reaction.

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