Residual dust charges in discharge afterglow
Résumé
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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