Double layer formation in the expanding region of an inductively coupled electronegative plasma
Date
2005-02-24
Authors
Plihon, N.
Corr, C. S.
Chabert, P.
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American Institute of Physics (AIP)
Abstract
Double-layers (DLs) were observed in the expanding region of an inductively coupled plasma with Ar–SF₆ gas mixtures. No DL was observed in pure argon or SF₆ fractions below a few percent. They exist over a wide range of power and pressure although they are only stable for a small window of electronegativity (typically between 8% and 13% of SF₆ at 1 mTorr), becoming unstable at higher electronegativity. They seem to be formed at the boundary between the source tube and the diffusion chamber and act as an internal boundary [the amplitude being roughly 1.5(kTe∕e)] between a high electron density, high electron temperature, low electronegativity plasma upstream (in the source), and a low electron density, low electron temperature, high electronegativity plasma downstream.
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Keywords: Boundary conditions; Carrier concentration; Diffusion; Electric charge; Multilayers; Pressure effects; Thermal effects; Double layer formation; Electronegative plasma; Gas mixtures; Internal boundary; Inductively coupled plasma
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Applied Physics Letters
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