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Nature of the Vibrational-Loss EELS Peaks Measured from Ionic Specimens

The vibrational-loss (phonon) features measured by monochromated electron energy-loss spectroscopy of ionic or partially ionic materials are dominated by dipole scattering and characterized by a narrow Lorentzian angular distribution of scattered intensity. The same features are therefore visible in infraredabsorption spectra and are fully characterized in terms of a wavelength-dependent complex permittivity.