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  Trapping-desorption and direct-scattering of formaldehyde at Au(111).

Krüger, B. C., Park, G. B., Meyer, S., Wagner, R. J. V., Wodtke, A. M., & Schäfer, T. (2017). Trapping-desorption and direct-scattering of formaldehyde at Au(111). Physical Chemistry Chemical Physics, 19(30), 19896-19903. doi:10.1039/c7cp03907g.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D0AD-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2E98-1
Genre: Journal Article

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Krüger, B. C., Author
Park, G. B.1, Author              
Meyer, S., Author
Wagner, R J. V., Author
Wodtke, A. M.1, Author              
Schäfer, T., Author
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 Abstract: Nonreactive surface scattering of atoms, molecules and clusters can be almost universally described by two mechanisms: trapping-desorption and direct-scattering. A hard cube model with an attractive square well provides a zeroth order description of the branching ratio between these two mechanisms as a function of the incidence energy. However, the trapping process is likely to be enhanced by excitation of internal degrees of freedom during the collision. In this molecular beam surface scattering study, we characterize formaldehyde/Au(111) scattering using angle resolved time-of-flight techniques. The two mechanisms are found to compete in the range of the investigated normal incidence energies between 0.1 and 1.3 eV. Whereas at low incidence energies trapping-desorption dominates, direct-scattering becomes more likely at incidence energies above 0.37 eV. This incidence energy is slightly higher than the desorption energy which is found to be 0.32 +/- 0.03 eV by temperature programmed desorption techniques. A simple hard cube model underestimates the observed trapping probabilities indicating the importance of trapping induced by excitation of internal molecular degrees of freedom.

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Language(s): eng - English
 Dates: 2017-07-102017-08-14
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c7cp03907g
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Pages: - Volume / Issue: 19 (30) Sequence Number: - Start / End Page: 19896 - 19903 Identifier: -