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Title: Controlling the charge of dust particles in an afterglow by modulating the plasma power

Journal Article · · Journal of Physics. D, Applied Physics

Abstract A dust particle immersed in a glow-discharge plasma has long been known to have a charge that is negative , while the plasma is powered. However, in the afterglow, following the stopping of the plasma power, a large positive charge can collect on the particle, as was shown recently for particles in a cathodic sheath. While that outcome of positive charging in the afterglow may be common, an experimental discovery reported here reveals that the opposite outcome is also possible: a particle can develop a negative charge in the afterglow, if the plasma had previously been operated with a modulated power. Before stopping the plasma power off altogether, in a run with power modulated at a low duty cycle of 4.5 % , the particle’s residual charge was negative, but it was positive in a control run without modulation. This result points to a way of controlling the charge of dust particles in a decaying plasma, which can be useful for mitigating defects in semiconductor manufacturing.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0014566; 1672641 and 1689926
OSTI ID:
2310394
Alternate ID(s):
OSTI ID: 2305406
Journal Information:
Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Vol. 57 Journal Issue: 20; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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