Abstract
High-resolution electron energy loss spectroscopy (HREELS) is employed to detect the formation of benzene following acetylene adsorption on the Pd(1 1 1) surface. At low exposures (0.25 L) the resulting spectra at 253 K are due to ethylidyne formation, but at higher exposures the presence of low coverages of benzene are indicated by the appearance of the strong benzene ν 4 (720 cm −1) band. A spectral subtraction method for HREELS is introduced which reveals an essentially complete benzene spectrum. The subtraction method proves favorable in removing spectral features which arise from the competing channel of vinylidene formation. The benzene coverage as a function of acetylene exposure is in close agreement with previous thermal desorption results and consistent with scanning probe microscopy studies.
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