Modulated molecular beam scattering of CO and NO from Pt(111) and the stepped Pt(557) crystal surfaces

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The modulated molecular beam scattering of CO and NO from Pt(111) and Pt(557) have been studied in the temperature range of 350-1100 K. For CO scattered from Pt(111), an adsorption-desorption model with constant sticking coefficient fits the data well above 500°K, The best rate parameters are: {nu}=2.9x10{sup 13}, E=29.9 kcal/mole, and S=0.74. For CO scattered from Pt(557) the same model fits the data well above 550°K and the best rate parameters are {nu}=7.9x10{sup 13}, E=33.6 kcal/mole, and S=0.74. The higher activation energy for desorption from the stepped Pt(557), as compared to the flat Pt(111), suggests that while the incident molecules ... continued below

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24 p.

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Lin, T. H. & Somorjai, G. A. November 1980.

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  • Lawrence Berkeley National Laboratory
    Publisher Info: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States). Materials Sciences Division
    Place of Publication: Berkeley, California

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The modulated molecular beam scattering of CO and NO from Pt(111) and Pt(557) have been studied in the temperature range of 350-1100 K. For CO scattered from Pt(111), an adsorption-desorption model with constant sticking coefficient fits the data well above 500°K, The best rate parameters are: {nu}=2.9x10{sup 13}, E=29.9 kcal/mole, and S=0.74. For CO scattered from Pt(557) the same model fits the data well above 550°K and the best rate parameters are {nu}=7.9x10{sup 13}, E=33.6 kcal/mole, and S=0.74. The higher activation energy for desorption from the stepped Pt(557), as compared to the flat Pt(111), suggests that while the incident molecules can be adsorbed at the step as well as at the terrace, their desorption energy is influenced by the presence of steps. An adsorption-desorption model with coverage-dependent sticking coefficient fits the data obtained at all temperatures well for both surfaces without change of the kinetic parameters. For NO scattered from Pt(111), the adsorption-desorption model with constant sticking coefficient fits the data well above 525°K using the rate parameters of {nu}=6.2x10{sup 13}, E=28.6 kcal/mole, and S=0.65. For NO scattered from Pt(557), the same model fits the data well above 525°K with {nu}=1.2x10{sup 14}, E=32.3 kcal/mole, and S=0.71. The higher activation energy suggests again that NO desorption is influenced by the presence of steps. Below 525°K, the NO scattering results are quite different from those of CO and can not be simulated with the simple models that were tried. The data can be used, however, to rule out several models of surface interactions. NO does not dissociate detectably between 400 K ~1200 K under our experimental conditions. The sticking coefficient decreases with increasing coverage.

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24 p.

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  • Journal Name: Surface Science; Journal Volume: 107; Journal Issue: 2-3; Related Information: pp. 573-585 in published journal article

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  • Report No.: LBL-11787
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1108709
  • Archival Resource Key: ark:/67531/metadc864033

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  • November 1980

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  • Sept. 16, 2016, 12:32 a.m.

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  • Dec. 6, 2016, 1:38 p.m.

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Lin, T. H. & Somorjai, G. A. Modulated molecular beam scattering of CO and NO from Pt(111) and the stepped Pt(557) crystal surfaces, article, November 1980; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc864033/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.