Simulation of the formation of dust grains in space by a plasma jet apparatus

Details Simulation of the formation of dust grains in space by a plasma jet apparatus Simulation of the formation of dust grains in space by a plasma jet apparatus

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jajap..25.1914t&link_type=abstract

Japanese Journal of Applied Physics, Part 1 (ISSN 0021-4922), vol. 25, Dec. 1986, p. 1914-1918.

Physics

Condensation, Cosmic Dust, Plasma Jets, Space Environment Simulation, Absorption Spectra, Carbon, Hydrogen, Infrared Spectra, Interplanetary Dust, Oxygen, Silicon

Scientific paper

Using a vacuum-tight plasma jet apparatus operated below one atmosphere, the condensation of solid particles in space was experimentally simulated. Atomized reactant gases consisting of Si, O, C, and H atoms generated in the plasma flame were injected into a reactor chamber filled with Ar gas of 200 Torr, and quenched into solid particles. The formed grains had irregular shapes and their sizes were smaller than 20 nm. X-ray diffraction patterns of the condensed grains showed no sharp peaks. It was found from IR absorption spectra that the particles contained C-H, Si-O, and Si-C bonds, irrespective of their initial abundances. These characteristics of the condensates were clearly different from those expected from equilibrium calculations.

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