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

B Niermann (1) , A Kanitz (1) , M Böke (1) , J Winter (1)

1 Institute for Experimental Physics II

Space and time resolved concentrations of helium He (3 S 1) 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.

Mots clés: 52.25.Vy; 52.38.Dx; 52.25.Ya

B Niermann, A Kanitz, M Böke, J Winter. Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air. Journal of Physics D: Applied Physics, 2011, 44 (32), pp.325201. ⟨10.1088/0022-3727/44/32/325201⟩. ⟨hal-00642390⟩