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Contrasting characteristics of sub-microsecond pulsed atmospheric air and atmospheric pressure helium–oxygen glow discharges

journal contribution
posted on 23.06.2010, 13:16 by James L. Walsh, Ding-Xin Liu, Felipe IzaFelipe Iza, Ming-Zhe Rong, Michael G. Kong
Glow discharges in air are often considered to be the ultimate low-temperature atmospheric pressure plasmas for numerous chamber-free applications. This is due to the ubiquitous presence of air and the perceived abundance of reactive oxygen and nitrogen species in air plasmas. In this paper, sub-microsecond pulsed atmospheric air plasmas are shown to produce a low concentration of excited oxygen atoms but an abundance of excited nitrogen species, UV photons and ozone molecules. This contrasts sharply with the efficient production of excited oxygen atoms in comparable helium–oxygen discharges. Relevant reaction chemistry analysed with a global model suggests that collisional excitation of O2 by helium metastables is significantly more efficient than electron dissociative excitation of O2, electron excitation of O and ion–ion recombination. These results suggest different practical uses of the two oxygen-containing atmospheric discharges, with air plasmas being well suited for nitrogen and UV based chemistry and He–O2 plasmas for excited atomic oxygen based chemistry.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

WALSH, J.L....et al., 2010. Contrasting characteristics of sub-microsecond pulsed atmospheric air and atmospheric pressure helium–oxygen glow discharges. Journal of Physics D: Applied physics, 43(032001), 7pp.

Publisher

© Institute of Physics Publishing

Version

NA (Not Applicable or Unknown)

Publication date

2010

Notes

This article is Restricted Access. It was published in the journal, Journal of Physics D: Applied Physics [© Institute of Physics Publishing]. The definitive version is available at: http://iopscience.iop.org/0022-3727/43/3/032001/

ISSN

0022-3727

Language

en

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