The Raman scattering from GaP microcrystals prepared by a gas-evaporation technique has been investigated. A new peak, which can be identified with the surface phonon mode, was found. The present results demonstrate that the surface phonon peak can be clearly observed only when the microcrystals are about one order of magnitude smaller than the wavelength of the incident laser radiation.
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Hayashi et al. (1982) studied this question.
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