2.5-300 micron laboratory observations of submicron SiC particles as cosmic dust candidates

Details 2.5-300 micron laboratory observations of submicron SiC particles as cosmic dust candidates 2.5-300 micron laboratory observations of submicron SiC particles as cosmic dust candidates

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986infph..26...37b&link_type=abstract

Infrared Physics (ISSN 0020-0891), vol. 26, Jan. 1986, p. 37-42. Research supported by the Ministero della Pubblica Istruzione.

Physics

19

Cosmic Dust, Infrared Spectroscopy, Silicon Carbides, Absorption Spectra, Carbon, Crystallography, Iron

Scientific paper

Spectral measurements have been carried out on alpha-type and beta-type SiC particles in the range of wavelengths from 2.5 to 300 microns, in order to determine the applicability as a model of cosmic dust grains. Controlled grinding of the particles permitted the selection of grains having the same dimensions as cosmic dust grains. Measurements of the shape, size distribution, and average elongation of the particles were carried out using TEM, and the spectral measurements were performed using a double beam spectrophotometer. It is found that outside the typical 11.5-micron absorption band, the steepness of the particle spectra of both types of particles increases as a function of sample purity. For the most pure SiC samples (99.3 percent), the FIR trend was fitted by a power law having an index of -1.4. The lowest values are interpreted as being due to contaminants in the samples. It is concluded that both alpha-SiC and pure beta-SiC particles have the same in FIR spectrum, making it possible to identify as solid grains the SiC particles observed in space.

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