LIF investigations of O and NO products in air like RF plasma jet

Abstract

Laser induced fluorescence by one (LIF) and two photon (TALIF) excitation has been employed to characterize NO, O species in the expanded stream of N2-O2 air like low pressure plasma jet. The gas, excited in a coaxial RF capacitive discharge at pressure P1, expands through a de Laval nozzle into a vessel at P2 = 0.25 Torr at expansion ratio P1/P2 of about 35. The multiple expansion– compression waves of the jet are traced by laser induced fluorescence of NO and O dissociation products expanding through the nozzle. The quantitative O and NO densities, obtained by in-situ calibration of TALIF and LIF signals are discussed.