Experimental determination of dust-particle charge in a discharge plasma at elevated pressures
2004 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 93, no 8Article in journal (Refereed) Published
The charge of dust particles is determined experimentally in a bulk dc discharge plasma in the pressure range 20-100 Pa. The charge is obtained by two independent methods: one based on an analysis of the particle motion in a stable particle flow and another on an analysis of the transition of the flow to an unstable regime. Molecular-dynamics simulations of the particle charging for conditions similar to those of the experiment are also performed. The results of both experimental methods and the simulations demonstrate good agreement. The charge obtained is several times smaller than predicted by the collisionless orbital motion theory, and thus the results serve as an experimental indication that ion-neutral collisions significantly affect particle charging.
Place, publisher, year, edition, pages
2004. Vol. 93, no 8
probes, object, grains
IdentifiersURN: urn:nbn:se:kth:diva-23669DOI: 10.1103/PhysRevLett.93.085001ISI: 000223472400038OAI: oai:DiVA.org:kth-23669DiVA: diva2:342368
QC 201005252010-08-102010-08-10Bibliographically approved