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20 Jul 2009

Volume 95, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 95, 033502 (2009); http://dx.doi.org/10.1063/1.3178556 (3 pages)

Akihito Ikedo, Takahiro Kawashima, Takeshi Kawano, and Makoto Ishida
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Electron avalanches and diffused γ-mode in radio-frequency capacitively coupled atmospheric-pressure microplasmas

D. W. Liu, F. Iza, and M. G. Kong

Appl. Phys. Lett. 95, 031501 (2009); http://dx.doi.org/10.1063/1.3186073 (3 pages) | Cited 19 times

Online Publication Date: 20 July 2009

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Space-, time- and wavelength-resolved optical emission profiles suggest that the helium emission at 706 nm can be used to indicate the presence of high energy electrons and estimate the sheath in helium rf discharges containing small concentration of air impurities. Furthermore, the experimental data supports the theoretical predictions of energetic electron avalanches transiting across the discharge gap in rf microdischarges and the absence of an α-mode. Nonetheless, microdischarges sustained between bare metal electrodes and operating in the γ-mode can produce diffuse glowlike discharges rather than the typical radially constricted plasmas observed in millimeter-size rf atmospheric-pressure γ discharges.
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52.80.Pi High-frequency and RF discharges
52.80.Hc Glow; corona
52.25.Vy Impurities in plasmas
52.40.Kh Plasma sheaths
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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