The second-, third-and fourth-order Raman spectra of GaP monocrystals have been investigated, and the relative intensities measured. It is found that the fourth-order Raman maxima are only a little less intense (about 5 times) than the thud-order ones. Polariton scattering from GaP has also been investigated. It is found that the intensities of polariton scattering and second-order scattering are similar.
Evidence for surface phonon modes has been found in the Raman spectra of bulk single crystals and in crystalline powders. The Raman spectra of distorted submicron layers and films have been studied as functions of the character of ion implantation and the type of subsequent annealing. The phenomenon of inelastic light hyperreflection from a crystal surface has also been observed.
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