Evidence for Eley-Rideal abstraction mechanism in reactive ion scattering of Cs from Pt(1 1 1) adsorbed with CO and CO2 |
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Authors: | Jung-Hwan Kim Heon Kang |
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Institution: | Department of Chemistry, Seoul National University, Gwanak-gu, Seoul 151-747, Republic of Korea |
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Abstract: | We studied the reactive ion scattering (RIS) of Cs+ from a Pt(1 1 1) surface adsorbed with CO and CO2 leading to the emission of CsCO+ and . 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 CO2 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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Keywords: | Ion scattering Eley-Rideal reaction Carbon monoxide Carbon dioxide Platinum |
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