The ultraviolet extinction by hollow spherical particles of graphite

Details The ultraviolet extinction by hollow spherical particles of graphite The ultraviolet extinction by hollow spherical particles of graphite

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.182...75i&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 182, no. 1, Aug. 1991, p. 75-80.

Astronomy and Astrophysics

Astrophysics

1

Cosmic Dust, Graphite, Interstellar Extinction, Interstellar Matter, Spheres, Ultraviolet Spectra

Scientific paper

The discrete dipole approximation has been used to calculate the extinction efficiency of hollow spherical particles of graphite as a possible constituent of interstellar grains. The particles had a shell structure with the basal plane perpendicular to the radius. The calculations were made on particles with an outer radius of 10 and 5 nm in the wave number region from 0.8 to 8.0 micron using the anisotropic optical constants. It is found that hollow particles with an inner radius equal to 0.65 of the outer radius yield an extinction feature at 4.6 micron, which fits fairly well to one observed in the interstellar extinction.

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