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  Vibrational excitation and relaxation of NO molecules scattered from a Au(111) surface.

Bartels, C., Golibrzuch, K., Kandratsenka, A., Cooper, R., Rahinov, I., Auerbach, D. J., et al. (2012). Vibrational excitation and relaxation of NO molecules scattered from a Au(111) surface. In M. Mareschal, & A. Santos (Eds.), Molecular beams and molecular collisions. 28. International Symposium on Rarefied Gas Dynamics. (pp. 1330-1339). Melville, N.Y.: American Institute of Physics. doi:10.1063/1.4769695.

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 Urheber:
Bartels, C., Autor
Golibrzuch, K., Autor
Kandratsenka, A.1, Autor           
Cooper, R., Autor
Rahinov, I., Autor
Auerbach, D. J.2, Autor           
Wodtke, A. M.2, Autor           
Affiliations:
1Research Group of Reaction Dynamics, MPI for biophysical chemistry, Max Planck Society, ou_578601              
2Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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 Zusammenfassung: We present results of recent and ongoing experiments on molecular-beam surface scattering of NO molecules from a Au(lll) surface. Vibrational excitation of NO(ν=0) into ν=l,2 was studied in great detail over a wide range of incidence energies (0.10-1.05 eV) and surface temperatures (300-1100 K). We find behavior characteristic of electronically nonadiabatic coupling of molecular vibration to electron-hole pair excitation in the gold crystal. A state-to-state kinetic model shows that for ν=2 excitation both the sequential (0→1→2) and direct (0→2) excitation pathways are important. The absolute excitation probabilities are also compared to the results of a first principles independent-electron surface hopping calculation, and good agreement is obtained. In addition to ν=l,2 excitation, we present the first evidence for second-overtone ν=3 vibrational excitation. Preliminary data for vibrational relaxation of laser-prepared NO(ν=3) show strong relaxation; the intrinsic coupling strengths are consistent with those obtained from vibrational excitation. Measurements of the translational inelasticity of NO(ν=3) show that the molecules lose a large fraction of translational energy in the collision. The translation-vibration coupling is significant but may depend on incidence energy, and a clear anticorrelation is observed between the final translational and rotational energies.

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Sprache(n): eng - English
 Datum: 2012-11-272012
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1063/1.4769695
 Art des Abschluß: -

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Titel: Molecular beams and molecular collisions. 28. International Symposium on Rarefied Gas Dynamics.
Genre der Quelle: Konferenzband
 Urheber:
Mareschal, M., Herausgeber
Santos, A., Herausgeber
Affiliations:
-
Ort, Verlag, Ausgabe: Melville, N.Y. : American Institute of Physics
Seiten: 10 Band / Heft: 2 Artikelnummer: - Start- / Endseite: 1330 - 1339 Identifikator: ISBN: 978-0-7354-1115-9