Optical constants of olivine particles between wavelengths of 7 and 200 microns

Details Optical constants of olivine particles between wavelengths of 7 and 200 microns Optical constants of olivine particles between wavelengths of 7 and 200 microns

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...87..180m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 87, Sept. 1990, p. 180-187.

Computer Science

35

Crystal Structure, Halley'S Comet, Infrared Radiation, Olivine, Optical Properties, Chemical Composition, Emission Spectra, Grain Size, Particle Size Distribution, Silicates

Scientific paper

Emission features are computed for spherical olivine particles of 0.03, 0.3, 3.0, and 30 micron radii, on the basis of laboratory determinations of the olivine particles' optical constants over the 7 to 200 micron range. It is noted that, while particles of radii smaller than 0.3 microns exhibit emission peaks at 16.3, 18.6, 23, 28, and 33.6 microns, together with a 10-micron region twin-peak structure, these readings weaken for particle radii of 3 microns or more. The appearance of the twin-peak feature in Comet P/Halley is accordingly judged to imply the presence of olivine particles smaller than 1 micron in radius; alternatively, such smaller olivines' enhancement may occur in the comet, which also exhibits a 10-micron silicate band twin-peak feature.

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