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CO (a 3Π) quenching at a metal surface: Evidence of an electron transfer mediated mechanism.

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Grätz,  Fabian
Department of Dynamics and Surfaces, MPI for biophysical chemistry, Max Planck Society;
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Georg-August-Universität Göttingen, Institut für Physikalische Chemie;

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Engelhart,  Dan P.
Department of Dynamics and Surfaces, MPI for biophysical chemistry, Max Planck Society;
Georg-August-Universität Göttingen, Institut für Physikalische Chemie;

Wagner,  Roman J. V.
Department of Dynamics and Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

Wodtke,  Alec M.
Department of Dynamics and Surfaces, MPI for biophysical chemistry, Max Planck Society;

Schäfer,  Tim
Department of Dynamics and Surfaces, MPI for biophysical chemistry, Max Planck Society;
Georg-August-Universität Göttingen, Institut für Physikalische Chemie;

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Citation

Grätz, F., Engelhart, D. P., Wagner, R. J. V., Meijer, G., Wodtke, A. M., & Schäfer, T. (2014). CO (a 3Π) quenching at a metal surface: Evidence of an electron transfer mediated mechanism. The Journal of Chemical Physics, 141(4): 044712. doi:10.1063/1.4887777.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0023-D103-B
Abstract
We observe a strong influence of molecular vibration and surface temperature on electron emission promoted by the de-excitation of metastable CO (a 3Π) on a clean Au(111) surface using a molecular beam surface scattering apparatus. The de-excitation is independent of incidence translational energy. These observations appear incompatible with existing theories of metastable particle de-excitation on metal surfaces, which are based on the Auger effect. Instead, they strongly suggest a mechanism involving formation of a transient anion whose lifetime is similar to the vibrational period of the CO molecule.