Light scattering by anisotropic particles

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Circular Polarization, Cosmic Dust, Interstellar Gas, Light Scattering, Optical Activity, Polarized Light, Spatial Distribution

Scientific paper

Light scattering by particles of arbitrary sizes and various shapes is analyzed using the Rayleigh-Gans approach, where the probability of secondary scattering within a particle is negligibly small. Stokes parameters are calculated for radiation scattered by anisotropic particles, representing either interstellar dust grains or molecules. Mechanisms are examined which can effectively transform linearly polarized radiation into circularly polarized radiation during scattering by randomly oriented anisotropic particles. It is shown that the optical activity of irregularly shaped dust grains may be very large, even if they consist of inactive and isotropic materials.

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