High resolution electron energy loss spectroscopy of an anisotropic insulator surface: A test for the dielectric theory

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Abstract
Electron energy loss measurements were performed on the α-Al2O3(0001) surface at temperatures between 120 and 350 K. Spectra of the Fuchs–Kliewer phonons were recorded with high energy resolution (26 cm−1). Numerical fits revealed that the spectra are quantitatively described by the macroscopic dielectric theory for anisotropic crystals. Comparisons are made with infrared data.