Abstract
In this work, coherent microwave Rayleigh scattering for the detection of resonance-enhanced multiphoton ionization (Radar REMPI) was used for the measurement of atomic oxygen in a nonequilibrium pulsed plasma discharge. Specifically, the detection of atomic oxygen is demonstrated in a pulsed discharge at 100 Torr in a molecular oxygen and helium gas mixture. REMPI was conducted using Nd:YAG pumped dye radiation at 618.9 nm mixed with the Nd:YAG 355 nm radiation, generating 225.6 nm laser light, of which two photons match the energy of the 2P33p(3P) electronically excited intermediate state of atomic oxygen. A third photon from the laser source then readily ionizes the atom in the 2 + 1 photon REMPI scheme. The Radar REMPI results are compared to two-photon absorption laser-induced fluorescence measurements from the literature, which shows reasonable agreement.
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