Abstract
Measurement of electric charge of dust particles in a plasma is one of important experiments for dusty plasmas. This chapter discusses the electric charge of dust particles (grains) immersed in a plasma, whose diameters are larger than “μ m”. The charge is detected by a charge sensitivity amplifier, and is analyzed with a spectroscopy system. The particles are found to be negatively charged and their electric charge is about 10 electrons. The measured values are close to a theoretical prediction. Experimental results show that the distribution of electric charge of dust particles is Gaussian and the dust radius is almost uniform, suggesting that this distribution depends only on the plasma state. The results also suggest that the electric charge of dust particles is influenced by electric temperature.
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