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

MPS-Authors
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Grätz,  F.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Engelhart,  D. P.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Wagner,  R. J. V.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Wodtke,  A. M.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Schäfer,  T.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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2049603.pdf
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Citation

Grätz, F., Engelhart, D. P., Wagner, R. J. V., Meijer, G., Wodtke, A. M., & Schäfer, T. (2014). CO (a(3)Pi) 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-0000-001A-2DBE-F
Abstract
We observe a strong influence of molecular vibration and surface temperature on electron emission promoted by the de-excitation of metastable CO(a(3)Pi) 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.