Abstract
Surface vibrational spectroscopy using infrared–visible sum-frequency generation was applied to the study of CO adsorption on the Pt(111) surface under high CO pressure at various temperatures. The temperature variation of the spectrum is reversible below 623 K. At ∼673 K, the spectrum changes with time, showing that most CO is thermally desorbed from the surface, some dissociated leaving carbon on the surface, and the platinum surface is presumably modified. A roughened platinum surface is effectively annealed under high CO pressure at room temperature. CO co-adsorbed with carbon on the surface causes a downshift in the frequency of the CO stretch peak.
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