Abstract
The adsorption of methyl radicals on two different oxygen-modified Mo(100) surfaces at room temperature has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH 4, H 2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 bdK. Methyl groups dehydrogenate at room temperature and reveal an OH stretching vibration as well as the CH 2 scissor mode. This data is compared to the results observed when CH 3OH is adsorbed on the same surface. In the latter case, no OH vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.
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