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  Observation of direct vibrational excitation in gas-surface collisions of CO with Au(111): a new model system for surface dynamics.

Schäfer, T., Bartels, N., Golibrzuch., K., Bartels, C., Köckert, H., Auerbach, D. J., et al. (2013). Observation of direct vibrational excitation in gas-surface collisions of CO with Au(111): a new model system for surface dynamics. Physical Chemistry Chemical Physics, 15(6), 1863-1867. doi:10.1039/c2cp43351f.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-DDE9-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-421D-F
Genre: Journal Article

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Schäfer, T.1, Author              
Bartels, N.1, Author              
Golibrzuch., K.1, Author              
Bartels, C.1, Author              
Köckert, H.1, Author              
Auerbach, D. J.1, Author              
Kitsopoulos, T. N.1, Author              
Wodtke, A. M.1, Author              
Affiliations:
1Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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 Abstract: We report vibrational excitation of CO from its ground (v = 0) to first excited (v = 1) vibrational state in collision with Au(111) at an incidence energy of translation of EI = 0.45 eV. Unlike past work, we can exclude an excitation mechanism involving temporary adsorption on the surface followed by thermalization and desorption. The angular distributions of the scattered CO molecules are narrow, consistent with direct scattering occurring on a sub-ps time scale. The absolute excitation probabilities are about 3% of those expected from thermal accommodation. The surface temperature dependence of excitation, which was measured between 373 and 973 K, is Arrhenius-like with an activation energy equal to the energy required for vibrational excitation. Our measurements are consistent with a vibrational excitation mechanism involving coupling of thermally excited electron–hole pairs of the solid to CO vibration.

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Language(s): eng - English
 Dates: 2012-12-182013
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c2cp43351f
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Pages: - Volume / Issue: 15 (6) Sequence Number: - Start / End Page: 1863 - 1867 Identifier: -