Positively charged particles in dusty plasmas.
The trapping of dust particles has been observed in a dc abnormal glow discharge dominated by electron attachment. A dust cloud of several tens of positively charged particles was found to form in the anode sheath region. An analysis of the experimental conditions revealed that these particles were positively charged due to emission process, in contrast to most other experiments on the levitation of dust particles in gas-discharge plasmas where negatively charged particles are found. An estimate of the particle charge, taking into account the processes of photoelectron and secondary electron emission from the particle surface, is in agreement with the experimental measured values.
Samarian
A A
AA
Institute for High Energy Densities, Russian Academy of Sciences, Moscow, 127412, Russia.
Vaulina
O S
OS
Nefedov
A P
AP
Fortov
V E
VE
James
B W
BW
Petrov
O F
OF