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Phonon- Versus Electron-Mediated Desorption and Oxidation of CO on Ru(0001)

MPS-Authors
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Bonn,  Mischa
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Funk,  Stephan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Hess,  Christian
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Denzler,  Daniel N.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Stampfl,  Catherine
Theory, Fritz Haber Institute, Max Planck Society;

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Scheffler,  Matthias
Theory, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Bonn, M., Funk, S., Hess, C., Denzler, D. N., Stampfl, C., Scheffler, M., et al. (1999). Phonon- Versus Electron-Mediated Desorption and Oxidation of CO on Ru(0001). Science, 285(5430), 1042-1045. doi:10.1126/science.285.5430.1042.


Cite as: https://hdl.handle.net/21.11116/0000-0008-C91B-8
Abstract
Heating of a ruthenium surface on which carbon monoxide and atomic oxygen are coadsorbed leads exclusively to desorption of carbon monoxide. In contrast, excitation with femtosecond infrared laser pulses enables also the formation of carbon dioxide. The desorption is caused by coupling of the adsorbate to the phonon bath of the ruthenium substrate, whereas the oxidation reaction is initiated by hot substrate electrons, as evidenced by the observed subpicosecond reaction dynamics and density functional calculations. The presence of this laser-induced reaction pathway allows elucidation of the microscopic mechanism and the dynamics of the carbon monoxide oxidation reaction.