Abstract
We have used scanning tunneling microscopy (STM) and Fourier transform infrared spectroscopy (FTIR) to examine clean and oxygen-precovered Cu(110) surfaces that have been exposed to methyl acetate (CH 3CO 2CH 3). Both clean and completely saturated (2×1)O surfaces are comparatively inert to methyl acetate exposure. Methyl acetate reacts on surfaces containing (2×1)O islands and areas of the clean surface resulting in the appearance of (5×2) structures. We propose that these (5×2) structures consist of equal numbers of methoxy (CH 3O) and acetate molecules (CH 3CO 2). Over time, these (5×2) structures disappear from the surface due to the decomposition of the methoxy and the resultant formation of a mobile acetate species on this surface. We have performed STM experiments that support these interpretations.
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