Co desorption and adsorption on Pt(111) |
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Authors: | Daniel H Winicur Jerry Hurst Charles A Becker Lennard Wharton |
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Institution: | The James Franck Institute and the Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA |
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Abstract: | The kinetics of the desorption of CO from a Pt(111) crystal between 419 and 505 K is reported using a Low-Energy Molecular-Beam-Scattering (LEMS) technique with a helium probe beam and a CO dosing beam. The resulting first-order Arrhenius rate constant is . We also report a study of the equilibriumadsorbed CO between 400 and 600 K using LEMS. These results, fitted to a Temkin isotherm model, indicate that the adsorption energy decreases linearly with surface coverage with the average value equal to over the coverage range 0 < θ ? 0.5. The average harmonic oscillator frequency of the adsorbed CO molecules is 191 ± 76 cm?1. |
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