Infrared Spectroscopy of CO on Metals

The vibrational spectrum of carbon monoxide on metal surfaces has been studied from both theoretical and experimental spectroscopic perspectives. Althou it is not necessary to review these results within the scope of tUs chapter, a summary of the most important aspects will serve as a guide for the application of the technique to colloidal metals. 

The surface of a metal crystallite offers a variety of binding sites for CO, as does a well defined single crystal surface. Adsorbed CO can be found in bn-top sites (i. e. in a linear terminal binding mode) and twofold, threefold, or even fourfold bridging ates. On well defined gle crystal surfaces, the adsorbed CO molecules are known to organize into ordered domains of various synunetries. The vibrational spectra of CO in such environments are determined by a complex 

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