Time-resolved OES of nanosecond pulsed discharges in N${}_2$ and N${}_2$/H${}_2$O mixtures]{Time-resolved optical emission spectroscopy of nanosecond pulsed discharges in atmospheric pressure N${}_2$ and N${}_2$/H${}_2$O mixtures

Abstract

In this contribution, nanosecond pulsed discharges in N${}_2$ and N${}_2$/0.9% H${}_2$O at atmospheric pressure (at 300 K) are studied with time-resolved imaging, optical emission spectroscopy and Rayleigh scattering. A 170 ns high voltage pulse is applied across two pin-shaped electrodes at a frequency of 1 kHz. The discharge consists of three phases: an ignition phase, a spark phase and a recombination phase. During the ignition phase the emission is mainly caused by molecular nitrogen (N${}_2$(C-B)). In the spark and recombination phase mainly atomic nitrogen emission is observed. The emission when H${}_2$O is added is very similar, except the small contribution of H${}_{\alpha }$ and the intensity of the molecular N${}_2$(C-B) emission is less.

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