Abstract
CO adsorbed on Pt(S)- [n(1 1 1)×(1 1 1)] electrodes was studied using infrared reflection absorption spectroscopy (IRAS) in 0.1 M HClO 4 saturated with CO. The configuration of adsorbed CO depends on the terrace width remarkably: on-top and threefold CO are co-adsorbed on the surfaces with terrace atomic rows ( n) more than nine, whereas only on-top CO appears on the surfaces with n less than eight, on which no multi-bonded CO was observed. Integrated intensity of the IRAS band and peak shift (d ν/d E) do not depend on the crystal orientation.
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