Scattering by Nonspherical Particulates.
Final rept. 1 Nov 78-31 Oct 80,
STATE UNIV OF NEW YORK AT ALBANY SPACE ASTRONOMY LAB
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Mie theory, which treats only spheres, is usually employed to predict the scattering of light by particles whose size is of the order of the wavelength. The effects due to particle shape--a cylinder 41, prolate spheroids 41 and 21, a sphere, oblate spheroids 21 and 41, and a disk 41--are investigated for 4 sizes spanning the resonant region. All particles have the same index of refraction, M 1.61 - 10.004i, representative of silicates. microwave analog and theoretical methods are used to derive the scattered intensity and degree of polarization as a function of scattering angle along with the extinction. All results refer to an ensemble or a cloud of identical particles because averages have been taken over random particle-orientations. The degree of polarization, backscatter, and the radiation pressure cross-section are most sensitive to particle shape, implying the use of Mie theory may be inappropriate for many applications.