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Metastable argon atoms under significant neutral depletion in helicon plasmas by laser-induced fluorescence

Seo, B. H. and Kim, J. H. and You, S. J. (2017) Metastable argon atoms under significant neutral depletion in helicon plasmas by laser-induced fluorescence. Current Applied Physics, 17 (10). pp. 1254-1259. ISSN 1567-1739 . http://resolver.caltech.edu/CaltechAUTHORS:20170628-154557685

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Abstract

We study the spatial distribution of the metastable-state argon atoms in high density helicon plasmas by means of laser-induced fluorescence. It is observed that the neutral argon in metastable-state has an anomalous radial distribution in density; it has a caldera-like shape radially, which is rare in typical low-temperature plasmas such as inductively coupled plasmas wherein the density increases toward the discharge center, as previously reported. The formation of the distribution can be explained as it forms by the combined effects of significant neutral depletion in high plasma density, off-axis electron-density distribution, and increasing diffusive loss toward the wall. To establish the assertion with the underlying physics, we calculate a simple global model and obtain the neutral density distribution in metastable-state under various conditions. The calculated results qualitatively agree with the experimental results.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.cap.2017.05.010DOIArticle
http://www.sciencedirect.com/science/article/pii/S1567173917301542PublisherArticle
Additional Information:© 2017 Elsevier B.V. Received 18 March 2017, Accepted 19 May 2017, Available online 24 May 2017.
Subject Keywords:Argon neutral; Metastable-state; Helicon plasmas; LIF
Record Number:CaltechAUTHORS:20170628-154557685
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170628-154557685
Official Citation:B.H. Seo, J.H. Kim, S.J. You, Metastable argon atoms under significant neutral depletion in helicon plasmas by laser-induced fluorescence, Current Applied Physics, Volume 17, Issue 10, October 2017, Pages 1254-1259, ISSN 1567-1739, https://doi.org/10.1016/j.cap.2017.05.010. (http://www.sciencedirect.com/science/article/pii/S1567173917301542)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78677
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Jun 2017 22:54
Last Modified:28 Jun 2017 22:54

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