Surface vibrations and the nature of the adsorption state: C2H2 on Pt(111) |
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Authors: | H. Ibach H. Hopster B. Sexton |
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Affiliation: | (1) Institut für Grenzfl?chenforschung und Vakuumphysik, Kernforschungsanlage Jülich GmbH, D-5170 Jülich, Fed. Rep. Germany;(2) Present address: University of California, Berkeley, California |
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Abstract: | Molecular vibrations of C2H2 and C2D2 adsorbed on Pt(111) at 140 K and ∼300K have been measured by high resolution electron energy loss spectroscopy. The comparison of C2H2 and C2D2 spectra allows an unambiguous assignment of the observed losses to the excitation of C−H bending, C−H stretching, and C−C stretching modes of nondissociatively adsorbed acetylene. From the relative intensities of losses the hybridisation state is determined to be nearsp 2. The C−C stretching frequency indicates a C−C bond order of ∼1.8. |
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Keywords: | 68.20− s 68.30+z 82.65Jv |
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