Low-frequency Raman spectra of some glasses have been measured at low temperature. Comparison of the spectra with heat-capacity data shows that in a broad frequency range the Raman intensity is simply proportional to the number of vibrational excitations [density of the vibrational states g(ν) multiplied by the Bose factor]. The conclusion is reached that g(ν) up to half of the Debye frequency may be evaluated from the low-frequency Raman spectra of disordered solids.

• Received 31 March 1993

DOI:https://doi.org/10.1103/PhysRevB.48.7692