Investigation of the electrostatic charging of dust particles in a Paul-trap

Details Investigation of the electrostatic charging of dust particles in a Paul-trap Investigation of the electrostatic charging of dust particles in a Paul-trap

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.171..217p&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

2

Cosmic Dust, Electric Discharges, Electrostatic Charge, Charged Particles, Interstellar Matter, Vacuum Chambers

Scientific paper

Dust particles (glass, tungsten, and nickel) with sizes ranging from 0.25 to 3 microns were levitated in a Paul-trap and charged by ions or electrons. For ions the particle potential is limited at field strength of about 1 x 10 to the 9th V/m by a temperature-dependent discharge mechanism. The particles interaction with 2 to 20 keV electrons always leads to positive surface potentials which can be explained in terms of a decreased absorption of electrons by small particles. Micrometer sized agglomerates were used for the investigation of the electrostatic fragmentation. Fragmentation takes place in a twofold manner: small surface 'fluff' can be removed or the parent particle can be disrupted into smaller agglomerates.

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