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Far-infrared transmission measurement was made at room temperature on ZnO small crystals. Both spectra of samples obtained by dry grinding ZnO commercial powder and by burning Zn powder in air show a strong and broad absorption peak at about 400 cm -1 , and other two different peaks, which shift to low frequency side as the refractive index of the matrix increases. Spectra are interpreted fairly well by the generalized electromagnetic scattering theory applied to a sphere and a cylinder. No coupled LO phonon-plasmon modes were observed.
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Yamamoto et al. (1977) studied this question.
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