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Electron hole pair mediated vibrational excitation in CO scattering from Au(111): Incidence energy and surface temperature dependence.

MPS-Authors
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Shirhatti,  P. R.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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Golibrzuch,  K.
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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Bartels,  C.
Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society;

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(Publisher version), 788KB

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Citation

Shirhatti, P. R., Werdecker, J., Golibrzuch, K., Wodtke, A. M., & Bartels, C. (2014). Electron hole pair mediated vibrational excitation in CO scattering from Au(111): Incidence energy and surface temperature dependence. Journal of Chemical Physics, 141(12): 124704. doi:10.1063/1.4894814.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-27EC-0
Abstract
We investigated the translational incidence energy (E i ) and surface temperature (T s ) dependence of CO vibrational excitation upon scattering from a clean Au(111) surface. We report absolute v = 0 → 1 excitation probabilities for E i between 0.16 and 0.84 eV and T s between 473 and 973 K. This is now only the second collision system where such comprehensive measurements are available – the first is NO on Au(111). For CO on Au(111), vibrational excitation occurs via direct inelastic scattering through electron hole pair mediated energy transfer – it is enhanced by incidence translation and the electronically non-adiabatic coupling is about 5 times weaker than in NO scattering from Au(111). Vibrational excitation via the trapping desorption channel dominates at E i = 0.16 eV and quickly disappears at higher E i