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Spatially-Resolved Spectroscopic Diagnostics of a Miniature RF Atmospheric Pressure Plasma Jet in Argon Open to Ambient Air

1
Plasma Processing Laboratory, Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada
2
Département de Physique, Université de Montréal, Montréal, QC H2V 0B3, Canada
*
Authors to whom correspondence should be addressed.
Plasma 2020, 3(2), 38-53; https://doi.org/10.3390/plasma3020005
Received: 26 October 2019 / Revised: 13 January 2020 / Accepted: 19 March 2020 / Published: 1 April 2020
(This article belongs to the Special Issue Low Temperature Plasma Jets: Physics, Diagnostics and Applications)
The spatially-resolved electron temperature, rotational temperature, and number density of the two metastable Ar 1 s levels were investigated in a miniature RF Ar glow discharge jet at atmospheric pressure. The 1 s level population densities were determined from optical absorption spectroscopy (OAS) measurements assuming a Voigt profile for the plasma emission and a Gaussian profile for the lamp emission. As for the electron temperature, it was deduced from the comparison of the measured Ar 2 p i 1 s j emission lines with those simulated using a collisional-radiative model. The Ar 1 s level population higher than 10 18 m 3 and electron temperature around 2.5 eV were obtained close to the nozzle exit. In addition, both values decreased steadily along the discharge axis. Rotational temperatures determined from OH(A) and N 2 (C) optical emission featured a large difference with the gas temperature found from a thermocouple; a feature ascribed to the population of emitting OH and N 2 states by energy transfer reactions involving the Ar 1 s levels. View Full-Text
Keywords: atmospheric pressure plasma jet; optical emission spectroscopy; optical absorption spectroscopy; collisional-radiative model atmospheric pressure plasma jet; optical emission spectroscopy; optical absorption spectroscopy; collisional-radiative model
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Sainct, F.P.; Durocher-Jean, A.; Gangwar, R.K.; Mendoza Gonzalez, N.Y.; Coulombe, S.; Stafford, L. Spatially-Resolved Spectroscopic Diagnostics of a Miniature RF Atmospheric Pressure Plasma Jet in Argon Open to Ambient Air. Plasma 2020, 3, 38-53.

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