Optical constants of fine particles for the infrared region

Details Optical constants of fine particles for the infrared region Optical constants of fine particles for the infrared region

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..127k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, July 1, 1989, p. 127-137.

Astronomy and Astrophysics

Astronomy

18

Infrared Radiation, Interstellar Matter, Optical Thickness, Amorphous Silicon, Infrared Sources (Astronomy), Interstellar Chemistry

Scientific paper

The optical constants n and k of fine particles such as silicates in mid- and far-infrared are determined. The transmittance of a KBr pellet of finely ground particles of minerals such that 2(pi)a/lambda much less than 1 (a is the grain radius and lambda the wavelength) was measured, and the mass absorption coefficient was derived independently of the grain-size distribution. The optical constants n and k were estimated with the aid of dispersion formula. The validity of the method was checked by measuring the reflectivity R and the mass absorption coefficient of obsidian. Derived optical constants n and k from these measurements showed good agreement with each other. The infrared properties of fused quartz and hydrous silicates were determined.

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