Abstract
The adsorption of CO on a Pt(111) surface held at 20 K under ultrahigh
vacuum was investigated using vibrational and thermal desorption
spectroscopies. In contrast to adsorption at higher temperatures,
surface diffusion of chemisorbed CO across the surface was suppressed
and vibrational spectroscopy showed non-equilibrium occupation of
top, bridge and three-fold hollow sites. The saturation coverage
of chemisorbed CO at 20 K was 0.5 ML. The infrared absorption band
attributed to three-fold hollow site CO was centered at 1736 cm-1.
The integrated absorbance of the 1736 cm-1 band grew in and saturated
as the exposure was increased from 0.35 to 1 ML.
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