Abstract
The Cz.sbnd;O stretching band is recorded for CO adsorbed on an evaporated gold film. This band appears at 2120 cm −1 for low coverage and shifts to 2115 cm −1 for maximum coverage. The reflection-absorption system produces a measurable band from as little as 1 20 of monolayer coverage of CO, using a standard spectrometer with no additional signal processing. From the band intensities adsorption isobars and isosteres are plotted. From the isosteres, heats of adsorption and entropy changes on adsorption are obtained for coverages ranging from 0.1 to 0.6 monolayer. The isosteric heat of adsorption for coverages from 0.1 to 0.6 averages 13.1 kcal mole . The difference between the gas phase entropy at 1 atm and the differential molar entropy of the adsorbed layer averages 26.3 cal mole° C .
Published Version
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