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Methods, Difficulties, and First Results in Laboratory Simulation of Cosmic Dust Electric Charging

  • J. Svestka (a1) and E. Grün (a2)

Abstract

Particles of radii 0.2 to 3 μm and of different materials were suspended in an electrodynamic quadrupole inside a vacuum chamber and exposed to beams of electrons and ions of energies up to 20 keV and 5 keV, respectively, with the aim to simulate electric charging of cosmic dust particles. It was found that the equilibrium surface electrostatic potential of glass particles of radii 0.2 to 2 μ charged by electrons of energies 1 to 20 keV is always positive. This can be explained by secondary electron emission at lower energies of electrons and by penetration of electrons through particles with subsequent secondary electron emission mainly from the exit side at higher energies. In case of charging by ions electrostatic potential of particles is generally much lower than expected values and interpretation of results of measurement is more complicated. The most promising way to eliminate instrumental influences disturbing processes of charging seems to be a construction of a smaller suspension system in which these influences would be negligible. Parameters of such a suspension system were derived from results of measurements.

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References

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Boehnhardt, H. and Fechtig, H. (1987) ’Electrostatic charging and fragmentation of dust near P/Giacobini-Zinner and P/Halley’, Astron. Astrophys. 187, 824828.
Grim, E., Morfill, G.E. and Mendis, D.A. (1984) ’Dust-magnetosphere interactions’, in Greenberg, R. and Brahic, A. (eds.), Planetary Rings, Univ. of Arizona Press, Tuscon, pp. 275332.
Hashimov, N.M. and Tarakanov, V.L. (1982) ’Surface charge influence on sublimation rates of icy grains and cometary nuclei’, Komety i Meteory 32, 39.(in Russian)
Morfill, G.E., Grün, E. and Leinert, C. (1986) ’The interaction of solid particles with the interplanetary medium’, in Marsden, R. G. (ed.), The Sun and the Heliosphere in Three Dimensions, D. Reidel Publishing Co., , Dordrecht, pp. 455474.
Pinter, S., Svestka, J. and E., Grün (1990) ’Interaction of dust particles with electrons and ions’, in Bussoletti, E. and Vittone, A. A. (eds.), Dusty Objects in the Universe, Kluwer Academic Publishers, Dordrecht, pp. 139146.
Svestka, J., Grün, E., Pinter, S. and Schumacher, S. (1987) ’Laboratory charging of dust by electrons and ions’, Publ., of Astron. Inst, of Czechoslovak Academy of Sci. 67, 277280.
Whipple, E. C. (1981) ’Potentials of surfaces in space’, Rev. Prog. Phys. 44, 11971250.

Methods, Difficulties, and First Results in Laboratory Simulation of Cosmic Dust Electric Charging

  • J. Svestka (a1) and E. Grün (a2)

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