The scattering matrix for size distributions of irregular particles: An application to an olivine sample |
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Authors: | F Moreno R Vilaplana O Muoz A Molina D Guirado |
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Institution: | aInstituto de Astrofísica de Andalucía, CSIC, P.O. Box 3004, 18008 Granada, Spain;bDepartamento de Física Aplicada, Universidad Politécnica de Valencia, E.P.S.A. 03801 Alcoy, Spain;cDepartamento de Física Aplicada, Universidad de Granada, Spain |
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Abstract: | We have compared simulated and measured scattering matrices of a size distribution of olivine particles at wavelengths of 633 and 442 nm. The computations were carried out for size distributions of irregularly-shaped compact particles with different average projected areas using the discrete-dipole approximation (DDA). The results of the comparison show that the model of irregularly-shaped particles mimic the observations far better than the results given by spheres, spheroids or rectangular prisms having a wide range in aspect ratios. The computed scattering matrices for size distributions of irregularly-shaped particles do not depend very strongly on the precise particle shape assumed, providing a method to infer certain physical properties of an ensemble of natural dust particles, such as the refractive index, when some information on the sample, as the size distribution, is known a priori. |
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Keywords: | Single scattering Scattering matrix Nonspherical particles Mineral aerosols Discrete-dipole approximation color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVR-4HWXD7K-K&_mathId=mml19&_user=10&_cdi=5541&_rdoc=29&_acct=C000053510&_version=1&_userid=1524097&md5=af9181a51bda43dd7e85a9505f7f1a56" title="Click to view the MathML source" T-matrix" target="_blank">alt="Click to view the MathML source">T-matrix |
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