Abstract
Fraunhofer diffraction dominates the intensity of light scattered near the forward direction by opaque particles. The pattern within about 0·7 the forward scattered intensity is shown to be approximated by Gaussian functions characterized by a radius of gyration defined somewhat differently for opaque single oriented, randomly oriented homogeneous and heterogeneous microparticles samples. The Gaussian function allows extrapolation of diffraction data to zero scattering angle and thus the obtaining of the projected particle area. The latter together with the radius of gyration gives a rotational inertia for homogeneous samples. Data analysis and interpretation procedures are presented for opaque microparticles in the range from 1 μm to 100 μm.
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