Abstract
Recent experimental data on infrared absorption by CO molecules adsorbed on two, stepped platinum surfaces reveal two bands. At low coverage, a single band appears from CO adsorbed on atoms lying along the steps. From the data and model calculation we see that the appearance of the higher wavenumber band, at intermediate coverage, signals the onset of two-dimensional island growth. The single, higher wavenumber band at high coverage results from an in-phase vibration mode of atoms on both step and terrace sites. Isolated molecules on terrace, step, and kink sites have wavenumbers of 2074, 2065, and 2060 cm −1 respectively.
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