On the use of the H α spectral line to determine the electron density in a microwave (2.45 GHz) plasma torch at atmospheric pressure

The electron density of an argon microwave (2.45 GHz) plasma flame generated at atmospheric pressure has been determined by using the Stark broadening of the experimentally measured H α line emitted by the discharge. The H β line was not observable under the experimental conditions of this discharge...

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Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 2006-05, Vol.61 (5), p.540-544
Main Authors: Yubero, C., García, M.C., Calzada, M.D.
Format: Article
Language:English
Subjects:
Atmospheric pressure
Electron density and temperature diagnosis
Microwave discharges
Plasma spectroscopy
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Summary:The electron density of an argon microwave (2.45 GHz) plasma flame generated at atmospheric pressure has been determined by using the Stark broadening of the experimentally measured H α line emitted by the discharge. The H β line was not observable under the experimental conditions of this discharge. Two methods have been employed to obtain the electron density from the Stark broadening of the H α line. The first used the Gigosos–Cardeñoso computational model that considers the strong broadening of the H α line by ionic dynamics. Alternatively, a second method based on a calibration of Stark broadenings of H α and H β lines offered a simpler way to obtain the electron density.
ISSN:0584-8547
1873-3565
DOI:10.1016/j.sab.2006.03.011