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28 Feb 2005

Volume 86, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 86, 093101 (2005); http://dx.doi.org/10.1063/1.1870108 (3 pages)

G. S. Paraoanu and A. M. Halvari
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Double layer formation in the expanding region of an inductively coupled electronegative plasma

N. Plihon, C. S. Corr, and P. Chabert

Appl. Phys. Lett. 86, 091501 (2005); http://dx.doi.org/10.1063/1.1869533 (3 pages) | Cited 39 times

Online Publication Date: 24 February 2005

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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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52.40.Kh Plasma sheaths
52.25.Fi Transport properties
52.40.Hf Plasma-material interactions; boundary layer effects

Large-volume and low-frequency atmospheric glow discharges without dielectric barrier

J. J. Shi and M. G. Kong

Appl. Phys. Lett. 86, 091502 (2005); http://dx.doi.org/10.1063/1.1879095 (3 pages) | Cited 11 times

Online Publication Date: 25 February 2005

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It is widely believed that, at low frequencies of 1–100 kHz, the generation of atmospheric pressure glow discharges (APGD) requires a dielectric barrier added to at least one electrode. This letter reports the experimental observation of a uniform and stable APGD generated between two bare electrodes without a dielectric barrier over a wide frequency range from 20 kHz to 260 kHz. Below 70 kHz, it is shown that preionization in the rising phase of the applied voltage is important and plasma generation occurs in the voltage-falling phase. Mechanism of barrier-free APGD is found to be different from both atmospheric dielectric-barrier discharges and radio-frequency APGD.
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52.80.Hc Glow; corona
52.25.Jm Ionization of plasmas
52.50.-b Plasma production and heating
52.25.Fi Transport properties
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
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