Dynamic displacement of N2 from Ru(0001) by incident D and H atoms

Exposing a N2 covered Ru(0001) surface to a D or H atom beam leads to desorption of the N2 molecules. This displacement is kinetically prompt at all N2 coverages and the process is identified as dynamic displacement. By showing that the cross section for displacement by D atoms is roughly twice that...

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Veröffentlicht in:The Journal of chemical physics 2001-03, Vol.114 (9), p.4215-4220
Hauptverfasser: Diekhöner, L., Mortensen, H., Åkerlund, C., Baurichter, A., Luntz, A. C.
Format: Artikel
Sprache:eng
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Zusammenfassung:Exposing a N2 covered Ru(0001) surface to a D or H atom beam leads to desorption of the N2 molecules. This displacement is kinetically prompt at all N2 coverages and the process is identified as dynamic displacement. By showing that the cross section for displacement by D atoms is roughly twice that for H atoms, we suggest that the mechanism for this dynamic displacement is some phonon mediated process rather than an electronically nonadiabatic one suggested earlier. As a contrast, the displacement of Xe adsorbed on Pt(111) induced by CO adsorption has also been measured. In this case, the displacement is not prompt and there is a total coverage on the surface that is necessary to induce desorption of Xe. This seems well described by a thermodynamic displacement mechanism.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1344924