Laboratory measurements of physical properties on submicronic particles candidate as cosmic dust

Mathematics – Logic

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Carbon, Cosmic Dust, Graphite, Interstellar Extinction, Microparticles, Particle Size Distribution, Silicon Carbides, Amorphous Materials, Carbon Stars, Crystal Structure, Physical Properties

Scientific paper

The results of attempts to produce submicron particles of SiC, graphite and amorphous C with spectral extinction properties typical of dust expected to be found around carbon stars are reported. The trials consisted of striking an arc between carbon electrodes in an Ar atmosphere, burning benzene and xylene in air, and arc production of SiC in a He atmosphere. TEM analysis was used to determine the morphological properties, e.g., the grain shapes, dimensions, and size distributions, of the resulting particles. The crystalline structures of the grains and their extinction efficiencies were also examined. Beta-SiC, rather than alpha-SiC, was found to yield spectral extinction bands similar to those observed in interstellar dust spectra, while both amorphous C and graphite yielded extinction spectra similar to cosmic dust spectra.

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