Abstract

A statistical approach is presented for calculation of the extinction of light by small, irregularly shaped particles in the framework of the strong-permittivity fluctuations theory. To this end the Dyson equation in the bilocal approximation is solved. The method, which is applicable even for particles with large optical constants, is used in the determination of the extinction cross section of interstellar dust particles in the visible and infrared region. The particles are assumed to be aggregates of the ballistic particle cluster aggregation type. A strong enhancement of the extinction in the far infrared is found. For moderate optical constants the results agree with Bruggeman’s effective-medium theory.

© 1995 Optical Society of America

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