A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(
1S) auroral lines in ambient air.
Sci Rep 2021;
11:1893. [PMID:
33479428 PMCID:
PMC7820241 DOI:
10.1038/s41598-021-81488-x]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 01/07/2021] [Indexed: 12/02/2022] Open
Abstract
Creation of the “auroral” green line, a fascinating occurrence commonly observed in the upper atmosphere, has long been a difficult endeavor, especially at atmospheric pressure. Here we report strong emission of the “auroral” green line for the first time in a kHz frequency, linear field atmospheric pressure plasma jet system. The device used 99.999% pure argon as a working gas for the plasma generation. Optical emission spectroscopy measurements of the after discharge region show the existence of 557.7 nm emission which corresponds to the transition O(\documentclass[12pt]{minimal}
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\begin{document}$$^1$$\end{document}1S)–O(\documentclass[12pt]{minimal}
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\begin{document}$$^1$$\end{document}1D). The intensity of the produced green line is strong enough that the entire plasma plume in the ambient air is visible as a green plasma. We provide the chemical reactions of O(\documentclass[12pt]{minimal}
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\begin{document}$$^1$$\end{document}1S) production in the plasma and the estimation of the density of the O(\documentclass[12pt]{minimal}
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\begin{document}$$^1$$\end{document}1S) metastable state using the kinetic reactions. Further, the O(\documentclass[12pt]{minimal}
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\begin{document}$$^1$$\end{document}1S) emission is characterized by changing the flow rate of argon, applied voltage and electrode gap. The adequate plasma length (\documentclass[12pt]{minimal}
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\begin{document}$$> 25 \, \hbox {mm}$$\end{document}>25mm) along with the production of a variety of reactive components viz; OH, \documentclass[12pt]{minimal}
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\begin{document}$${\hbox {N}}_{2}^{+}$$\end{document}N2+ and oxygen (777 nm) make this configuration useful for applications such as: blood coagulation, cancer treatment, sterilization, and waste treatment. Moreover, this setup can be potentially used as a test bed for the in-depth understanding of plasma chemistry relevant to the aurora and comet tails using a laboratory setting.
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