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Abstract
We have computed the Raman scattering intensity for very large bond-percolating clusters and diffusion-limited cluster - cluster aggregates in three dimensions. Using the spectral moments method, we considered both scalar and bond-bending potentials to model interactions between atoms of our fractal systems. We assumed that scattering was produced either by the dipole-induced dipole (DID) or by the bond-polarizability mechanisms. The results have been analysed in terms of the light scattering scaling theory and compared with the experimental Raman scattering data obtained for silica aerogels. We found that the DID mechanism applied to the diffusion-limited cluster - cluster aggregation model gives a good description of the Raman scattering in base-catalysed silica aerogels.
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