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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