Abstract
This paper reviews some recent developments in high resolution electron energy loss spectroscopy (HREELS) studies of adsorbed molecules. The principal theme is the negative ion resonance scattering mechanism and its usefulness in the investigation of surface vibrational states. Several examples are considered: first, the excitation of low frequency molecule-surface modes, including overtones, as illustrated by the case of physisorbed O 2/Pt(111); secondly, the relationship between the σ resonance energy and the bond length in HREELS studies of chemisorbed molecules, and illustrated by the examples of chemisorbed O 2/Pt(111) and chemisorbed CO; finally, the utility of the resonance scattering mechanism in unravelling the behaviour of a complex adsorption system, coadsorbed K and O 2 on graphite.
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