DOI: 10.1063/1.458155. A comparative kinetic study of xenon adsorption on a flat Pt(111) and stepped Pt(557) and Pt(112) surfaces

A comparative kinetic study of xenon adsorption on a flat Pt(111) and stepped Pt(557) and Pt(112) surfaces

10.1063/1.458155

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The adsorption and desorption kinetics for Xe on three Pt single crystalline surfaces have been measured using threshold temperature programmed desorption measurements. It has been found that the first-order desorption kinetic parameters at zero coverage for Xe on Pt(111) (E0d =5.73±0.50 kcal/mol; ν0d=1012.5±0.9 s−1) are in excellent agreement with measurements made by a modulated molecular beam method [E0d =5.65±0.35 kcal/mol; ν0d=1012.1 s−1]. The presence of step defect sites of varying density on Pt(557) (1/6 defects) and on Pt(112) (1/3 defects) is shown to have a marked influence on Xe desorption kinetics, producing larger values of E0d≂8.5–8.7 kcal/mol and larger values of ν0d ≂1014 s−1 compared to Pt(111). In addition, for Pt(111), slight attractive Xe–Xe interactions are observed, whereas for Xe adsorption on step sites, repulsive Xe–Xe interactions are observed as the steps fill. Xe adsorption kinetics on Pt(111) at 87 K are consistent with an island growth mechanism. In contrast, on Pt(557) and Pt(112), the adsorption process does not seem to produce island growth on the terraces. These results, taken together, show that using Xe, defect sites on metals may be probed effectively with adsorption and desorption kinetic methods.

Bibliography

Siddiqui, H. R., Chen, P. J., Guo, X., & Yates, J. T. (1990). A comparative kinetic study of xenon adsorption on a flat Pt(111) and stepped Pt(557) and Pt(112) surfaces. The Journal of Chemical Physics, 92(12), 7690â7699.

Authors 4

H. R. Siddiqui (first)
P. J. Chen (additional)
X. Guo (additional)
J. T. Yates (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:12 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 6:36 a.m.)
Indexed	1 year ago (Aug. 2, 2024, 7:55 a.m.)
Issued	35 years, 2 months ago (June 15, 1990)
Published	35 years, 2 months ago (June 15, 1990)
Published Print	35 years, 2 months ago (June 15, 1990)

Funders 0

None

BibTeX

@article{Siddiqui_1990, title={A comparative kinetic study of xenon adsorption on a flat Pt(111) and stepped Pt(557) and Pt(112) surfaces}, volume={92}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.458155}, DOI={10.1063/1.458155}, number={12}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Siddiqui, H. R. and Chen, P. J. and Guo, X. and Yates, J. T.}, year={1990}, month=jun, pages={7690–7699} }

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  "abstract": "<jats:p>The adsorption and desorption kinetics for Xe on three Pt single crystalline surfaces have been measured using threshold temperature programmed desorption measurements. It has been found that the first-order desorption kinetic parameters at zero coverage for Xe on Pt(111) (E0d =5.73\u00b10.50 kcal/mol; \u03bd0d=1012.5\u00b10.9 s\u22121) are in excellent agreement with measurements made by a modulated molecular beam method [E0d =5.65\u00b10.35 kcal/mol; \u03bd0d=1012.1 s\u22121]. The presence of step defect sites of varying density on Pt(557) (1/6 defects) and on Pt(112) (1/3 defects) is shown to have a marked influence on Xe desorption kinetics, producing larger values of E0d\u22428.5\u20138.7 kcal/mol and larger values of \u03bd0d \u22421014 s\u22121 compared to Pt(111). In addition, for Pt(111), slight attractive Xe\u2013Xe interactions are observed, whereas for Xe adsorption on step sites, repulsive Xe\u2013Xe interactions are observed as the steps fill. Xe adsorption kinetics on Pt(111) at 87 K are consistent with an island growth mechanism. In contrast, on Pt(557) and Pt(112), the adsorption process does not seem to produce island growth on the terraces. These results, taken together, show that using Xe, defect sites on metals may be probed effectively with adsorption and desorption kinetic methods.</jats:p>",
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    "timestamp": 1707564967000
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  "resource": {
    "primary": {
      "URL": "https://pubs.aip.org/jcp/article/92/12/7690/971705/A-comparative-kinetic-study-of-xenon-adsorption-on"
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  "subtitle": [],
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  "ISSN": [
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    "1089-7690"
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