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10 May 2010

Volume 96, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 96, 193101 (2010); http://dx.doi.org/10.1063/1.3425776 (3 pages)

J. J. Zhang, N. Hrauda, H. Groiss, A. Rastelli, J. Stangl, F. Schäffler, O. G. Schmidt, and G. Bauer
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Pressure-independent point in current-voltage characteristics of coplanar electrode microplasma devices operated in neon

Lingguo Meng, Jianping Xing, Zhihu Liang, Chunliang Liu, and Zhaojun Lin

Appl. Phys. Lett. 96, 191501 (2010); http://dx.doi.org/10.1063/1.3428789 (3 pages)

Online Publication Date: 11 May 2010

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We introduce the idea of a pressure-independent point (PIP) in a group of current-voltage curves for the coplanar electrode microplasma device (CEMPD) at neon pressures ranging from 15 to 95 kPa. We studied four samples of CEMPDs with different sizes of the microcavity and observed the PIP phenomenon for each sample. The PIP voltage depends on the area of the microcavity and is independent of the height of the microcavity. The PIP discharge current, IPIP, is proportional to the volume (Vol) of the microcavity and can be expressed by the formula IPIP = IPIP0+D×Vol. For our samples, IPIP0 (the discharge current when Vol is zero) is about zero and D (discharge current density) is about 3.95 mA mm−3. The error in D is 0.411 mA mm−3 (less than 11% of D). When the CEMPD operates at VPIP, the discharge current is quite stable under different neon pressures.
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52.75.-d Plasma devices
52.80.-s Electric discharges
52.25.Fi Transport properties

Generation of ultrahigh frequency air microplasma in a magnetic loop and effects of pulse modulation on operation

Mazdak Taghioskoui, Joshua Perlow, Mona Zaghloul, and Akbar Montaser

Appl. Phys. Lett. 96, 191502 (2010); http://dx.doi.org/10.1063/1.3429093 (3 pages) | Cited 2 times

Online Publication Date: 13 May 2010

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An atmospheric pressure air microplasma (APAMP) source was developed under ambient conditions using a magnetic loop at an operating frequency of 740 MHz. A self-igniting, stable APAMP was generated at 9.5 W. Pulse modulation (PM) was applied to the ultra high frequency signal. The effects of PM on self-ignition and operation of the APAMP source were studied by using a square wave modulating signal in the frequency range of 5–30 KHz. With the application of PM on the APAMP, in the best case, the plasma self-ignites and is sustained at 2.5 W.
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52.50.Dg Plasma sources

Characterization and mechanism studies of dielectric barrier discharges generated at atmospheric pressure

Jie Tang, Yixiang Duan, and Wei Zhao

Appl. Phys. Lett. 96, 191503 (2010); http://dx.doi.org/10.1063/1.3430008 (3 pages) | Cited 12 times

Online Publication Date: 14 May 2010

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A dielectric barrier discharge (DBD) device operated at ambient air with an ac power supply was designed and examined. The discharge power and active current of DBD were characterized. Experimental results show that the discharge power does not proportionally increase all along with voltage. Through in-depth analysis of typical waveforms of instantaneous applied voltage and discharge current, and images of microdischarges in the gas gap, it is inferred that considerable reduction in charges transferred through discharge channels is most likely due to recombination and attachment to electronegative molecules, nonuniform highly distorted electric fields, and repulse of more homogeneous electric charges.
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52.80.-s Electric discharges
52.75.-d Plasma devices
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