Denzler, D. N. ; Frischkorn, C. ; Hess, C. ; Wolf, M. ; Ertl, G. (2024)
Electronic Excitation and Dynamic Promotion of a Surface Reaction.
In: Physical Review Letters, 2003, 91 (22)
doi: 10.26083/tuprints-00026900
Artikel, Zweitveröffentlichung, Verlagsversion
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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: | 2024 |
| Autor(en): | Denzler, D. N. ; Frischkorn, C. ; Hess, C. ; Wolf, M. ; Ertl, G. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Electronic Excitation and Dynamic Promotion of a Surface Reaction |
| Sprache: | Englisch |
| Publikationsjahr: | 23 April 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2003 |
| Ort der Erstveröffentlichung: | College Park, MD |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 91 |
| (Heft-)Nummer: | 22 |
| Kollation: | 4 Seiten |
| DOI: | 10.26083/tuprints-00026900 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/26900 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| 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: | 226102 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-269003 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Hinterlegungsdatum: | 23 Apr 2024 08:27 |
| Letzte Änderung: | 24 Apr 2024 14:21 |
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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) [Gegenwärtig angezeigt]
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