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Phys Rev E Stat Nonlin Soft Matter Phys
; 74(2 Pt 2): 026403, 2006 Aug.
Article
in English
| MEDLINE
| ID: mdl-17025546
ABSTRACT
An on-ground measurement of dust-particle residual charges in the afterglow of a dusty plasma was performed in a rf discharge. An upward thermophoretic force was used to balance the gravitational force. It was found that positively charged, negatively charged, and neutral dust particles coexisted for more than 1 min after the discharge was switched off. The mean residual charge for 200-nm-radius particles was measured. The dust particle mean charge is about -5e at a pressure of 1.2 mbar and about -3e at a pressure of 0.4 mbar .
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