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Journal of Spectroscopy
Volume 2014, Article ID 952138, 6 pages
Research Article

Emission Spectroscopy of OH Radical in Water-Argon Arc Plasma Jet

Institute of Plasma Physics v.v.i., Za Slovankou 3, 18200 Prague, Czech Republic

Received 10 January 2014; Revised 15 March 2014; Accepted 17 March 2014; Published 7 April 2014

Academic Editor: Manuel A. Gonzalez

Copyright © 2014 Alan Mašláni and Viktor Sember. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Emission spectra of OH radical are studied in the plasma jet generated by a plasma torch with hybrid water-argon stabilization. Plasma jet is located in a chamber with pressures 4 kPa and 10 kPa. In spite of high temperatures of produced plasma, OH spectra are observed in a large area of the jet. OH spectra are used to obtain rotational temperatures from the Boltzmann plots of resolved rotational lines. Due to line-of-sight integration of radiation, interpretation of the temperatures is not straightforward. It seems that excited OH molecules can be formed by various mechanisms, mainly in the outer parts of the jet, where thermal processes are not as dominant as in the hot central region.