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On the Contribution of Edge Phonons to the Electron-Energy-Loss Spectrum of LiF(001) Surface

Highly-resolved electron-energy-loss spectra (EELS) from the (001) surface of LiF clearly exhibit a two-oscillator structure, although a single-peak loss spectrum is expected for a clean, flat surface. We attribute the additional peak to macroscopic phonons localized near the edges of thermal etch pits that are known to develop on the surface of LiF. By performing theoretical calculations of the EELS spectrum of a single, 90° LiF wedge with a sharp edge, we indeed prove that edge phonons are responsible for electron-energy losses at the position of the supplementary peak observed in the EELS spectrum.