No abstract

Nanosecond Repetitively Pulsed Discharges have been proven to be efficient in flame stabilization. A two-step mechanism was proposed to explain the increased reactivity afforded by the discharge. This mechanism first creates excited electronic states of nitrogen, which then dissociate molecular oxygen through quenching reactions. In this paper, we investigated the temperature of the gas during and after the discharge using Optical Emission Spectroscopy on the second positive system of nitrogen, and simulated spectra from SPECAIR. The spatial profiles of excited nitrogen species densities in the discharge were determined using Abelinverted spectra of the first and second positive system of nitrogen. The time evolution of the absolute density of N 2 (B) and N 2 (C) was also determined and the quenching rates of N 2 (B) and N 2 (C) by collisions with O 2 were found to be 2.5 (±0.5)x10 -10 cm 3 .s -1 and 5.2 (±0.5)x10 -10 cm 3 .s -1 at 2000 K.

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