High-resolution temperature-dependent inelastic low-energy electron diffraction applied to the surface-plasmon dispersion of aluminum (100)

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Abstract
Elastic and inelastic low-energy-electron-diffraction measurements on a clean A1(100) surface have been obtained with a new high-resolution electron diffractometer. These data, together with data obtained independently at another laboratory, provide the experimental basis for the determination of the surface-plasmon dispersion relation. A survey of specular elastic scattering is used to select elastic resonances which may be described by single scattering theory. Inelastic data are presented which are associated by two-step inelastic scattering with the selected elastic diffraction resonances. The temperature dependence of the inelastic coherent and diffuse scattering is also examined and its effect on the measurement of the surface-plasmon dispersion relation is discussed.