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5 Jul 2010

Volume 97, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 97, 013301 (2010); http://dx.doi.org/10.1063/1.3458867 (3 pages)

M. Uno, Y. Hirose, T. Uemura, K. Takimiya, Y. Nakazawa, and J. Takeya
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Removal of floating dust in glow discharge using plasma jet

C. M. Ticoş, I. Jepu, C. P. Lungu, P. Chiru, V. Zaroschi, and A. M. Lungu

Appl. Phys. Lett. 97, 011501 (2010); http://dx.doi.org/10.1063/1.3460293 (3 pages) | Cited 1 time

Online Publication Date: 6 July 2010

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Dust can be an inconvenient source of impurities in plasma processing reactors and in many cases it can cause damage to the plasma-treated surfaces. A technique for dust expulsion out of the trapping region in plasma is presented here, based on the wind force exerted on dust particles by a pulsed plasma jet. Its applicability is demonstrated by removing floating dust in the sheath of parallel-plate capacitive radio-frequency plasma.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.77.-j Plasma applications
52.80.Hc Glow; corona
52.25.Vy Impurities in plasmas

Evidence of atomic adsorption on TiO2 under plasma exposure and related C2H2 surface reactivity

O. Guaitella, C. Lazzaroni, D. Marinov, and A. Rousseau

Appl. Phys. Lett. 97, 011502 (2010); http://dx.doi.org/10.1063/1.3462295 (3 pages) | Cited 2 times

Online Publication Date: 8 July 2010

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Adsorption/reaction kinetics of C2H2 on the surface of plasma-treated SiO2 and TiO2 catalysts is studied. The catalysts are pretreated with a dc discharge in Ar, O2, N2, or air. Then 950 ppm of C2H2 in air is introduced in the closed-volume reactor. It is found that TiO2 pretreated with O2 or air plasma catalyzes C2H2 removal from the gas phase without any UV activation. During 10 min after introduction the loss of C2H2 in the whole reactor is about 5×1015 molecules. Comparison between different pretreatment procedures shows that weakly bonded oxygen atoms may remain on TiO2 long after plasma exposure.
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68.43.Mn Adsorption kinetics
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Enhancement of a laminar premixed methane/oxygen/nitrogen flame speed using femtosecond-laser-induced plasma

Xin Yu, Jiangbo Peng, Peng Yang, Rui Sun, Yachao Yi, Yongpeng Zhao, Deying Chen, and Junhua Yu

Appl. Phys. Lett. 97, 011503 (2010); http://dx.doi.org/10.1063/1.3457384 (3 pages) | Cited 1 time

Online Publication Date: 9 July 2010

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We first investigate the effects of femtosecond-laser-induced plasma on the flame speed of a laminar premixed methane/oxygen/nitrogen flame with a wide range of the equivalence ratios (0.8–1.05) at atmospheric pressure. It is experimentally found that the flame speed increases 20.5% at equivalence ratios 1.05. The self-emission spectra from the flame and the plasma are studied and an efficient production of active radicals under the action of femtosecond (fs)-laser pulses has been observed. Based on the experimental data obtained, the presence of oxygen atom and hydrocarbon radicals is suggested to be a key factor enhancing flame speed.
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47.70.Pq Flames; combustion
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
47.15.-x Laminar flows

Pressure dependence of plasma structure in microwave gas breakdown at 110 GHz

Alan Cook, Michael Shapiro, and Richard Temkin

Appl. Phys. Lett. 97, 011504 (2010); http://dx.doi.org/10.1063/1.3462320 (3 pages) | Cited 11 times

Online Publication Date: 9 July 2010

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Recent studies of 110 GHz microwave discharges in air at atmospheric pressure have demonstrated formation of a large array of quarter-wavelength-spaced plasma filaments. Here we present measurements showing that as pressure is decreased from atmosphere to a few torr, the discharge transitions from a well-defined array to a smeared-out array and finally to a diffuse plasma. Despite the distinct nature of breakdown phenomena at high microwave frequencies, the pressure dependence of the breakdown threshold field is seen to follow a Paschen-type curve. Data for air and argon at 110 GHz are compared with previous low-frequency data.
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52.80.-s Electric discharges
52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
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