E. Duval et al., LOW-FREQUENCY RAMAN-SCATTERING FROM GLASSES - FREQUENCY-DEPENDENCE, Physical review. B, Condensed matter, 48(22), 1993, pp. 16785-16787
To interpret the linear frequency dependence of the Raman light-vibrat
ion coupling coefficient C(omega)), the disorder in glasses is charact
erized by two different correlation lengths, radial (along a line) and
angular (between lines).