Dust-particle charge in weakly ionized gas-discharge plasma
Joint Institute for High Temperatures, Russian Academy of Sciences - Moscow, 125412 Russia
Accepted: 24 January 2012
The results of the measurements of the charge on dust suspended in a laboratory rf-discharge plasma are presented. Experiments were performed for both small-size clusters of particles and large quasi–two-dimensional systems formed in a wide range of plasma conditions. The estimations of dust charges were derived from the interaction potential profiles of dust particles and their characteristic oscillation frequencies obtained by two methods: one based on a solution of the inverse Langevin problem and another one on studying mass-transfer processes in a dusty subsystem. The experimental results were compared with numerical data and theoretical estimates based on the near-electrode layer theory and the OML approach for isotropic and anisotropic plasma.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.27.Gr – Strongly-coupled plasmas
© EPLA, 2012