A theory describing frequency and temperature dependences of the quasielastic peak (QEP) of low-frequency Raman scattering in glass-like materials is suggested. It is based on the ideas about dynamical fluctuations of defects concentration at the internal surface of the glass consisting of nanometer-size clusters. The fluctuations lead to variations of the Laplace pressure in the clusters and, as a consequence, the appearance of QEP. The theory results in a good quantitative description of the experimental low-frequency Raman spectra, which could not be achieved in framework of the known double-level system model.

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