Residual electric charges on dust grains at plasma extinction
Résumé
Complex (dusty) plasmas are partially ionized gases composed of neutral species, ions, electrons and charged dust particles. The experiment was performed in the PKE-Nefedov reactor where dust particles were physically grown by sputtering in discharge chamber. It was found coexistence of positively and negatively charged dust particles as well as non-charged ones for more than one minute after the discharge was switched off. The residual charges for 200 nm radius particles have been measured for two different pressures. It was revealed that dusts kept residual charges only when the discharge was abruptly switched off. Indeed when the discharge power is decreased slowly until the plasma disappeared, there was no residual charge on dust particles.
Origine | Accord explicite pour ce dépôt |
---|
Loading...