Abstract
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.
Highlights
Emission spectra of OH molecules are frequently observed in different types of plasmas, usually when water is present as one of the initial species
Emission spectra of OH radical are studied in the plasma jet generated by a plasma torch with hybrid water-argon stabilization
It is natural that OH spectra are often studied, OH radical is only one of the components, which create the chemistry of plasmas
Summary
Emission spectra of OH molecules are frequently observed in different types of plasmas, usually when water is present as one of the initial species. For the high power arc plasmas and plasma torches, OH molecules are investigated quite seldom [12, 13] It is partly caused by the fact that plasma torches often work with plasma forming gases, which do not allow formation of OH in relevant amount and their emission spectra contain strong lines of other species. OH is probably involved in two main applications of this torch, plasma spraying [15] and plasma aided gasification of waste materials [16] In the latter case, for example, OH is an important radical in the complicated chemistry, leading to the formation of syngas, that is, mixture of CO and H2. We get better insight into the distribution of OH and its formation in this plasma
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