Abstract
Isotopic mixtures of CO adsorbed on Cu(100) have been studied by infrared spectroscopy. For mixtures of 12C 16O/ 12C 18O at a constant coverage of 0.5 it was found that the molecules constitute a collective vibrational system. The C-O stretching vibrations were studied as a function of composition of the overlayer and the data are successfully interpreted by a dipole — dipole coupling theory.
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