It was recalled that a deep minimum in the absorption spectra of ice and some other highly transparent solids was often truncated by a segment that was proportional to the inverse 4th power of the wavelength. Such features were attributed to Rayleigh scattering, which was not distinguished from true absorption by the measurement technique. The magnitude of the scattering was enhanced, above intrinsic Rayleigh scattering, by the presence of nanoscale defects. This fact could be used to diagnose the presence of such defects.

P.B.Price, L.Bergström: Philosophical Magazine A, 1997, 75[5], 1383-90