Denzler, D. ; Frischkorn, C. ; Hess, C. ; Wolf, M. ; Ertl, G. (2003)
Electronic Excitation and Dynamic Promotion of a Surface Reaction.
In: Physical Review Letters, 91 (22)
doi: 10.1103/PhysRevLett.91.226102
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
The mechanism of recombinative desorption of hydrogen from a Ru(0001) surface induced by femtosecond-laser excitation has been investigated and compared to thermally initiated desorption. For the laser-driven process, it is shown that hot substrate electrons mediate the reaction within a few hundred femtoseconds resulting in a huge isotope effect between H₂ and D₂ in the desorption yield. In mixed saturation coverages, this ratio crucially depends on the proportions of H and D. Deviations from second order desorption kinetics demonstrate that the recombination is dynamically promoted by excitation of neighboring, but nonreacting adatoms. A concentration dependent rate constant which accounts for the faster excitation of H versus D is proposed.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2003 |
| Autor(en): | Denzler, D. ; Frischkorn, C. ; Hess, C. ; Wolf, M. ; Ertl, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Electronic Excitation and Dynamic Promotion of a Surface Reaction |
| Sprache: | Deutsch |
| Publikationsjahr: | 2003 |
| Ort: | College Park, MD |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 91 |
| (Heft-)Nummer: | 22 |
| DOI: | 10.1103/PhysRevLett.91.226102 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | The mechanism of recombinative desorption of hydrogen from a Ru(0001) surface induced by femtosecond-laser excitation has been investigated and compared to thermally initiated desorption. For the laser-driven process, it is shown that hot substrate electrons mediate the reaction within a few hundred femtoseconds resulting in a huge isotope effect between H₂ and D₂ in the desorption yield. In mixed saturation coverages, this ratio crucially depends on the proportions of H and D. Deviations from second order desorption kinetics demonstrate that the recombination is dynamically promoted by excitation of neighboring, but nonreacting adatoms. A concentration dependent rate constant which accounts for the faster excitation of H versus D is proposed. |
| ID-Nummer: | Artikel-ID: 226102 |
| Hinterlegungsdatum: | 29 Okt 2010 12:34 |
| Letzte Änderung: | 24 Apr 2024 14:26 |
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| Suche nach Titel in: | TUfind oder in Google |
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Electronic Excitation and Dynamic Promotion of a Surface Reaction. (deposited 23 Apr 2024 08:27)
- Electronic Excitation and Dynamic Promotion of a Surface Reaction. (deposited 29 Okt 2010 12:34) [Gegenwärtig angezeigt]
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