Electron Collisons, 234 (1994)
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Electron Scattering by Oriented Molecules on Surfaces
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| in "Electron Collisions with Molecules, Clusters and Surfaces", eds. H. Ehrhardt and L.A. Morgan (Plenum, New York, 1994), p. 243 |
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R.E. Palmer
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This paper presents a brief review of recent experimental studies of low
energy electron scattering by molecules oriented by adsorption on
well-defined solid surfaces, with emphasis on vibrational excitation via
the formation of intermediate negative ion resonance states. In
particular, it is shown that the high lying sigma shape resonance is
manifest in inelastic scattering by a variety of small molecules (e.g.
N2, CO, O2, NO), and that the angular distributions
of electrons scattered via this state reflect the orientation of the
molecule on the surface. A particular case study, physisorbed
O2/Pt(111), is considered in some detail. Here the excitation
of low frequency molecule-surface vibrational modes is observed in
addition to the intramolecular vibration and its overtones, and the
implications of such measurements for the investigation of the potential
energy surface describing the molecule-surface interaction are discussed.
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