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Experimental and modeling analysis of singlet delta oxygen kinetics in a repetitively pulsed nanosecond discharge

This paper presents new experimental and modeling results on the temporal evolution of atomic oxygen in nanosecond repetitively pulsed O2/Ar/H2 plasmas, measured using the two-photon absorption laser-induced fluorescence technique. The experimental measurements and modeling predictions focus on the effect of injected singlet delta oxygen, O2(a 1Δg), which was generated in a radio-frequency discharge. While no effect by singlet delta oxygen was unambiguously observed in the experimental data, modeling predictions indicate that this is due to rapid non-reactive quenching by HO2 radicals and H atoms.