Bidirectional Reflectance Spectroscopy5. The Coherent Backscatter Opposition Effect and Anisotropic Scattering

Details Bidirectional Reflectance Spectroscopy5. The Coherent Backscatter Opposition Effect and Anisotropic Scattering Bidirectional Reflectance Spectroscopy5. The Coherent Backscatter Opposition Effect and Anisotropic Scattering

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002icar..157..523h&link_type=abstract

Icarus, Volume 157, Issue 2, p. 523-534.

Statistics

Computation

120

Scientific paper

A model published previously by the author that describes light scattering from particulate media is modified to include several improvements: (1) a better approximation to the Ambartsumian-Chandrasekhar H-functions that is especially important for particles with single scattering albedos close to 1.00, (2) increased accuracy for anisotropically scattering particles, and (3) incorporation of coherent backscattering. The goal of the original model of being analytic and mathematically tractable is preserved. No new parameters are introduced by the first and second modifications; however, the third unavoidably adds two new parameters: the amplitude and width of the coherent backscatter opposition effect. Several examples are given in which the results of calculations using the original and new models are compared with exact numerical computations. It is shown that a medium composed of complex particles that are large compared to the wavelength can have a coherent backscatter opposition effect (CBOE) that is broad enough to be readily observable. The CBOE multiplies the entire reflectance and not just the multiply scattered component, so that a low-albedo medium, such as lunar regolith, can have a strong CBOE.

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