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  Electron-hole pair excitation determines the mechanism of hydrogen atom adsorption.

Bünermann, O., Jiang, H., Dorenkamp, Y., Kandratsenka, A., Janke, S. M., Auerbach, D. J., et al. (2015). Electron-hole pair excitation determines the mechanism of hydrogen atom adsorption. Science, 350(6266), 1346-1349. doi:10.1126/science.aad4972.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-1DBF-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2E1E-A
Genre: Journal Article

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2230919.pdf (Publisher version), 649KB
 
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 Creators:
Bünermann, O.1, Author              
Jiang, H.1, Author              
Dorenkamp, Y.1, Author              
Kandratsenka, A.1, Author              
Janke, S. M.1, Author              
Auerbach, D. J.1, Author              
Wodtke, A. M.1, Author              
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 Abstract: How much translational energy atoms and molecules lose in collisions at surfaces determines whether they adsorb or scatter. The fact that hydrogen (H) atoms stick to metal surfaces poses a basic question. Momentum and energy conservation demands that the light H atom cannot efficiently transfer its energy to the heavier atoms of the solid in a binary collision. How then do H atoms efficiently stick to metal surfaces? We show through experiments that H-atom collisions at an insulating surface (an adsorbed xenon layer on a gold single-crystal surface) are indeed nearly elastic, following the predictions of energy and momentum conservation. In contrast, H-atom collisions with the bare gold surface exhibit a large loss of translational energy that can be reproduced by an atomic-level simulation describing electron-hole pair excitation.

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Language(s): eng - English
 Dates: 2015-11-262015-12-11
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1126/science.aad4972
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Title: Science
Source Genre: Journal
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Pages: - Volume / Issue: 350 (6266) Sequence Number: - Start / End Page: 1346 - 1349 Identifier: -