Infrared reflectivity and second‐order Raman scattering in the mixed crystal system AgBr x Cl 1− x , were studied at 77 K. The TO(Γ) and LO(Γ) phonon frequencies obtained by means of a Kramers‐Kronig analysis shift continuously between their energetic positions in the pure components indicating one‐mode behaviour of the system. This result is discussed in view of a recent model that describes the optical modes of a mixed crystal. The LO(Γ) phonon frequencies taken from the Raman spectra are found to be slightly lower. A resonant enhancement of the 2L0 scattering process that occurs for z = 0.42 with shorter‐wavelength excitation is used to determine the longitudinal optical phonon frequency.
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Bootz et al. (1974) studied this question.
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