Charging of dust grains in a plasma

Details Charging of dust grains in a plasma Charging of dust grains in a plasma

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phrvl..73.3093b&link_type=abstract

Physical Review Letters, Volume 73, Issue 23, December 5, 1994, pp.3093-3096

Physics

146

Impurities In Plasmas, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus

Scientific paper

Charging of micron-sized dust grains in a plasma has been investigated experimentally. Dust grains were dispersed into a fully ionized, steady-state, magnetized plasma column consisting of electrons and K+ ions, both at a temperture of ~=0.2 eV. Langmuir probe measurements were used to determine how the negative charge in the plasma is divided between free electrons and dust grains. By varying the ratio d/λD between the intergrain spacing and the plasma Debye length, the predicted reduction in the grain charge for the case of ``closely packed'' grains (d/λD<1) has been demonstrated experimentally.

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