LIGHT-SCATTERING BY LOW-ENERGY EXCITATIONS IN GLASSES

It is well-known that the low-frequency Raman spectra in disordered ma terials have two contributions: vibrational, the so-called boson peak, and relaxational quasielastic scattering. Comparisons of the Raman sp ectra with neutron scattering and heat capacity data are presented. It shows that there is some intrinsic relation between the quasielastic scattering and the boson peak vibrations. The results are described in the framework of the model of damped oscillators.