A one dimensional model is used to examine the infrared line shape for the vibration of an atom chemisorbed on a solid. The calculation assumes that the mechanism of broadening is the coupling between the vibration of the atom and those of the lattice. It is shown that this mechanism cannot explain the large linewidths observed experimentally in case the solid is a metal. We believe that in this situation the broadening of the line is caused by the coupling between the vibrational motion of the chemisorbed molecule and the electronic degrees of freedom of the metal.
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Metiu et al. (1978) studied this question.
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