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In this contribution, nanosecond pulsed discharges in N$_{2}$ andN$_{2}$/0.9% H$_{2}$O at atmospheric pressure (at 300 K) are studied withtime-resolved imaging, optical emission spectroscopy and Rayleigh scattering. A170 ns high voltage pulse is applied across two pin-shaped electrodes at afrequency of 1 kHz. The discharge consists of three phases: an ignition phase,a spark phase and a recombination phase. During the ignition phase the emissionis mainly caused by molecular nitrogen (N$_{2}$(C-B)). In the spark andrecombination phase mainly atomic nitrogen emission is observed. The emissionwhen H$_{2}$O is added is very similar, except the small contribution ofH$_{\alpha}$ and the intensity of the molecular N$_{2}$(C-B) emission is less.

journal of physics. d, applied physics

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