Computer Science
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..156l&link_type=abstract
In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 156-157 (SEE N89-13330 04-
Computer Science
Cometary Atmospheres, Cosmic Dust, Grain Size, Light Scattering, Reflectance, Backscattering, Refractivity, Schroedinger Equation, Series Expansion, Surface Roughness
Scientific paper
While the electromagnetic field scattered by a spherical particle is classically obtained by the Helmholtz equation, the general case of an arbitrary particle may be investigated in the general framework of the interaction of a wave with a scattering potential. A wave function then satisfies the Schroedinger equation. The general solution of the Schroedinger equation is given. The main disadvantage of this approach are its restriction to large particles and its scalar nature preventing the calculation of the polarization. However, Perrin and Lamy have shown how to avoid the second limitation and retrieve a vectorial description. They proved that in the case of large spheres when the ad hoc assumptions are satisfied, the expression of the scattering amplitude may be approximated by an expansion series in partial waves, i.e., on a discrete basis. The analogy may be generalized, and the ratio of the two components for a rough particle obtained by taking the ratio of the reflectivities for the two directions of polarization. These reflectivities involve the simple and double reflections calculated following the method developed by Wolff for rough surfaces. The theory is further detailed.
Lamy Philippe L.
Perrin Jean-Marie
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