Abstract
The IRAS (infrared reflection absorption spectroscopy) method has been applied to the study of CO adsorption on Ni(111). Evidence has been found for the coexistence of two-fold and three-fold coordinated CO species at low CO coverages. A continuous coverage-dependent conversion from three-fold to two-fold bridged CO has been observed. Accurate correlation of the development of the IRAS spectra with CO coverage, with CO temperature programmed desorption behavior, and with LEED behavior has been established through studies of the frequency and lineshape of the spectral features. Evidence for inhomogeneous CO layers at the highest CO coverages was obtained. This work establishes baseline behavior for other IRAS studies of this system to be reported.
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