Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air

Details Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air

2011-05-04

arxiv.org/abs/1105.0833v2

Physics

Plasma Physics

Journal of Physics D: Applied Physics (accepted), 6 pages

Scientific paper

Space and time resolved concentrations of helium metastable atoms in an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. Spatial profiles as well as lifetime measurements show significant influences of air entering the discharge from the front nozzle and of impurities originating from the gas supply system. Quenching of metastables was used to deduce quantitative concentrations of intruding impurities. The impurity profile along the jet axis was determined from optical emission spectroscopy as well as their dependance on the feed gas flow through the jet.

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