Multiple-quantum excitation probabilities of Einstein-like modes of surface 
adsorbates induced by He-atom scattering

Manson, J. R.; Graham, A. P.; Li, M. B.

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Multiple-quantum excitation probabilities of Einstein-like modes of surface adsorbates induced by He-atom scattering

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Graham, A. P.
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Manson, J. R., Graham, A. P., & Li, M. B. (2002). Multiple-quantum excitation probabilities of Einstein-like modes of surface adsorbates induced by He-atom scattering. Journal of Physics-Condensed Matter, 14(24), 6233-6261.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-1773-6

Abstract

Experimental data exhibiting multiple-quantum excitation of the vibrational modes of decoupled, oscillating adsorbates on a surface via impact by a He atom are reviewed for the cases of carbon monoxide and heavy rare gases adsorbed on metal substrates. The experimental scattering spectra are analysed using a dynamical scattering model that predicts correctly the angular dependences of the distributions of multiphonon excitations and the variation with incident energy and adsorbate frequency. The agreement between experiment and theory indicates that the details of the He-surface interaction potential are relatively unimportant for incident energies much higher than the vibrational energy. The model is used to predict the excitation probabilities of other possible vibrational modes which have not yet been observed using helium-atom scattering.