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• W3207173651 abstract "In a plasma, the polarity of a dust grain's charge is typically negative, but it can reverse and become positive in an afterglow, when the power sustaining the plasma is switched off. This positive charging, which occurs in the afterglow's first few milliseconds, is studied for grains much larger than a few nm. It is hypothesized that the positive charging is enhanced by the presence of a dc electric field, which causes ions to drift through the neutral gas. A larger value of the reduced electric field E/N leads to a larger ion kinetic energy and thus a greater collection of positive charge on a grain. The maximum possible positive charge is attained if the grain's surface potential rises to match the ion kinetic energy, at a time before ions have departed and the grain's charge becomes frozen. Thereafter, when vacuum conditions prevail, the grain will retain its positive residual charge. In an experiment, dust grains were electrically levitated in a capacitively coupled plasma until the power was abruptly turned off. In the afterglow, grains fell faster than expected due to gravity alone, indicating a downward electric force, in the presence of a remaining dc electric field. Acceleration measurements yielded repeatable results for the residual charge's value, which was of the order +104e and increased with E/N, supporting the hypothesis." @default.
• W3207173651 created "2021-10-25" @default.
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• W3207173651 date "2021-10-01" @default.
• W3207173651 modified "2023-10-01" @default.
• W3207173651 title "Positive charging of grains in an afterglow plasma is enhanced by ions drifting in an electric field" @default.
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• W3207173651 doi "https://doi.org/10.1063/5.0069141" @default.
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