On the computation of optical properties of heterogeneous grains

Details On the computation of optical properties of heterogeneous grains On the computation of optical properties of heterogeneous grains

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..50..461b&link_type=abstract

Astrophysics and Space Science, vol. 50, no. 2, Aug. 1977, p. 461-472. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

26

Cosmic Dust, Dielectric Properties, Optical Properties, Graphite, Interplanetary Dust, Interstellar Matter, Optical Resonance

Scientific paper

The Maxwell-Garnet (MG) expression for the effective dielectric function of a composite medium consisting of small spherical inclusions in a homogeneous matrix is derived, with application to cosmic (cometary and interstellar) dust studies. It is shown that the MG theory accounts for dipole-dipole interactions among the inclusions and that the validity of the theory does not depend on the matrix being nonabsorbing. Two illustrative examples are discussed in the small particle limit: (1) a porous sphere and (2) spherical inclusions in a 'waxy' dielectric matrix. The effect of porosity in individual interstellar graphite grains, and of a waxy matrix containing small spherical graphite inclusions, on graphite particle resonance absorption at 2200 A are discussed.

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