Abstract
CO adsorption on Pt(1�1�1) was studied at temperatures between 373�K
and 463�K in a pressure range of 1�נ10-8-3�נ10-5�Torr. Adsorption
isotherms were obtained using sum frequency generation, (SFG). By
correlating the normalized SFG signal to the surface coverage, the
obtained isotherms are in satisfactory agreement with Langmuir adsorption,
which is suitable for coverages up to a monolayer. Close to saturation
coverage the heat of adsorption was determined to 113(�15)�kJ/mol,
which is in close agreement to values obtained by single crystal
adsorption calorimetry, low energy electron diffraction (LEED) and
temperature programmed desorption (TPD) Y.Y. Yeo, L. Vattuone, D.A.
King, J. Chem. Phys. 106 (1997) 392; G. Ertl, M. Neumann, K.M. Streit,
Surf. Sci. 64 (1977) 393.
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