Grain size dependence of far-infrared extinction spectra of amorphous fine grains

Details Grain size dependence of far-infrared extinction spectra of amorphous fine grains Grain size dependence of far-infrared extinction spectra of amorphous fine grains

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.134...95k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 134, no. 1, June 1987, p. 95-102.

Astronomy and Astrophysics

Astrophysics

15

Amorphous Materials, Far Infrared Radiation, Grain Size, Infrared Absorption, Interstellar Extinction, Molecular Spectra, Silicon Dioxide, Infrared Stars, Interstellar Matter

Scientific paper

The far-infrared extinction spectra of fused silica grains with the size range from 1.8 μm to 60 Å were measured. The spectra depend clearly on the grain size. For large grain sizes (from 1.8 μm to 400 Å) the spectra show almost the λ-2 dependence (λ is the wavelength), which resembles that of the bulk material. For fine grains (70 and 60 Å) the spectra are less steep, the wavelength dependence being λ-1. This grain size dependence of extinction spectra agrees essentially with the prediction of Seki and Yamamoto.

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