Distinctive discharge formation in atmospheric Ar and He plasmas was observed in the microwave frequency band using coaxial transmission line resonators. Ar plasmas formed a plasma plume whereas He formed only confined plasmas. As the frequency increased from 0.9 GHz to 2.45 GHz, the Ar plasma exhibited contraction and filamentation, and the He plasmas were constricted. Various powers and gas flow rates were applied to identify the effect of the electric field and gas flow rate on plasma plume formation. The He plasmas were more strongly affected by the electric field than the Ar plasmas. The breakdown and sustain powers yielded opposite results from those for low-frequency plasmas (∼kHz). The phenomena could be explained by a change in the dominant ionization process with increasing frequency. Penning ionization and the contribution of secondary electrons in sheath region reduced as the frequency increased, leading to less efficient ionization of He because its ionization and excitation energies are higher than those of Ar. The emission spectra showed an increase in the NO and N2 second positive band in both the Ar and He plasmas with increasing frequency whereas the hydroxyl radical and atomic O peaks did not increase with increasing frequency but were highest at particular frequencies. Further, the frequency effect of properties such as the plasma impedance, electron density, and device efficiency were presented. The study is expected to be helpful for determining the optimal conditions of plasma systems for biomedical applications.
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December 2013
Research Article|
December 10 2013
Distinctive plume formation in atmospheric Ar and He plasmas in microwave frequency band and suitability for biomedical applications
H. Wk. Lee;
H. Wk. Lee
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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S. K. Kang;
S. K. Kang
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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I. H. Won;
I. H. Won
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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H. Y. Kim;
H. Y. Kim
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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H. C. Kwon;
H. C. Kwon
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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J. Y. Sim;
J. Y. Sim
a)
Department of Electrical Engineering, Pohang University of Science and Technology
, Pohang 790-784, South Korea
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a)
Electronic mail: [email protected].
b)
Electronic mail: [email protected]. Fax: 82-54-279-2903.
Phys. Plasmas 20, 123506 (2013)
Article history
Received:
June 12 2013
Accepted:
November 22 2013
Citation
H. Wk. Lee, S. K. Kang, I. H. Won, H. Y. Kim, H. C. Kwon, J. Y. Sim, J. K. Lee; Distinctive plume formation in atmospheric Ar and He plasmas in microwave frequency band and suitability for biomedical applications. Phys. Plasmas 1 December 2013; 20 (12): 123506. https://doi.org/10.1063/1.4841295
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