Comparison of collective effects at scattering by randomly oriented clusters of spherical particles

Comparison of collective effects at scattering by randomly oriented cluster s of spherical particles are made in the double-interaction approximation. It allows to understand the roles of different physical mechanisms in scatt ering. Formulae for the double-interaction approximation are obtained and a pplied to calculate polarimetric properties of randomly oriented clusters i n polarized and non-polarized light. It is shown, in particular, that the f ield scattered by dense clusters of particles depends significantly on inte raction of components of single and double scattering. Besides, it is shown that near field can influence on the effect of weak photon localization. ( C) 1999 Elsevier Science Ltd. All rights reserved.