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Particle charge in the bulk of gas discharges
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2005 (English)In: Physical Review E, ISSN 1539-3755, Vol. 72, no 1Article in journal (Refereed) Published
Abstract [en]

An experimental determination of particle charge in a bulk dc discharge plasma covering a wide range of neutral gas pressures, was recently reported [S. Ratynskaia , Phys. Rev. Lett. 93, 085001 (2004)]. The charges obtained were several times smaller than the predictions of collisionless orbital motion limited theory. This discrepancy was attributed to the effect of ion-neutral collisions. In the present paper a more detailed description of this experiment is provided and additional experimental results obtained with particles of different sizes are reported. The measurements are compared with molecular dynamics simulations of particle charging for conditions similar to those of the experiment, with other available experimental data on particle charge in the bulk of gas discharges, and with a simple analytical model accounting for ion-neutral collisions. All the considered evidence indicates that ion-neutral collisions represent a very important factor, which significantly affects (reduces) the particle charge under typical discharge conditions.

Place, publisher, year, edition, pages
2005. Vol. 72, no 1
Keyword [en]
ion-drag force, falling dust particles, motion-limited theory, complex plasmas, langmuir probe, microgravity conditions, collisional plasmas, spherical probes, collection, grains
URN: urn:nbn:se:kth:diva-14954ISI: 000230887100076OAI: diva2:332995
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Ratynskaia, Svetlana V.

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