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Optical properties of a dispersion of anisotropic particles with non-randomly distributed orientations. The case of atmospheric ice crystals

Abstract:

The orientational distribution of the particles in a dispersion plays an important role in determining the optical properties of the dispersion as a whole. Since assessing the reliability of an assumed orientational distribution requires calculating an ensemble average over the particles concerned, we examine a few cases of orientational distributions that allow for analytical calculation of the average in the framework of the transition matrix approach. Explicit formulas are given and applied to the calculation of the forward-scattered and backscattered intensity from dispersions of model particles meant to simulate the optical behavior in the infrared of the atmospheric ice crystals that occur as hexagonal platelets. © 2001 Elsevier Science Ltd. All rights reserved.