Abstract
The method of theoretical analysis of normal vibrations of infinite two-dimensional ordered arrays of adsorbed molecules has been developed. Using this method, the vibrational state densities as well as dispersion surfaces describing frequency-phase dependences can be easily calculated for these arrays. The method is illustrated by calculating the dispersion surfaces and histograms of vibrational state densities for CO admolecules on Pt(100) at saturated coverages.
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