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16 Nov 2009

Volume 95, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 95, 204101 (2009); http://dx.doi.org/10.1063/1.3238316 (3 pages)

Gengxin Zhang, Brandon Weeks, Richard Gee, and Amitesh Maiti
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Characteristics of kilohertz-ignited, radio-frequency atmospheric-pressure dielectric barrier discharges in argon

Pei-Si Le, Guo Li, Sen Wang, He-Ping Li, and Cheng-Yu Bao

Appl. Phys. Lett. 95, 201501 (2009); http://dx.doi.org/10.1063/1.3263153 (3 pages) | Cited 2 times

Online Publication Date: 17 November 2009

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In this letter, ignited by a kilohertz atmospheric-pressure dielectric-barrier discharge (APDBD), the stable and uniform argon radio-frequency (rf) APDBDs are generated with lower rf ignition voltages compared to the conventional rf APDBDs without the aid of the kilohertz filamentary discharges. The experimental studies on the mechanisms of this dual-frequency APDBD method indicate that it is the filaments extending from the kilohertz electrode region to the rf electrode region that provide the seed electrons for the ignition of the rf APDBDs at the lower applied rf voltages. A 12-mm-long stable and uniform argon plasma jet is obtained using the coaxial-type plasma generator.
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52.80.Pi High-frequency and RF discharges
52.75.-d Plasma devices

Measurement of the electron density in a microwave plasma torch at atmospheric pressure

Qing Zhang, Guixin Zhang, Liming Wang, Xinxin Wang, Shumin Wang, and Yan Chen

Appl. Phys. Lett. 95, 201502 (2009); http://dx.doi.org/10.1063/1.3266923 (3 pages) | Cited 1 time

Online Publication Date: 20 November 2009

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The electron density in a microwave plasma torch at atmospheric pressure was measured with a Mach–Zehnder interferometer. The electron density is on the order of 1017/cm3, one order higher than that deduced from the Stark broadening of spectral lines, and increases with the increase in the microwave power. The spatial distribution of the electron density was obtained. The highest electron density locates at the symmetrical axis of the plasma torch and decreases radially. It was found that the electron density fluctuates within a range of 0.3 with the time under the same experimental conditions.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.75.Hn Plasma torches
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
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