RAYLEIGH-DEBYE SCATTERING OF LIGHT OF ANTHRACENE-CRYSTALS

Light scattering in pure solids is due to the extended discrete variation of the dielectric constant. To describe the scattering of light in anthracene crystals the Rayleigh-Debye theory is used. A direct relation between the nature of structural defects in molecular solids and the spatial variation of the dielectric constant is found. On the basis of the relation, the form of the scattering correlation function is derived. Theoretical relations describing the intensity of light scattering in molecular crystals are applied to experimental data concerning the intensity of scattered light in anthracene crystals as a function of wavelength for small angles of scattering. It is found that the diameter of the scattering centres in anthracene is of the order of few mum with concentration about 10(8) cm-3.