Kinetic mechanisms of NO removal are studied in N 2 /NO and N 2 /H 2 O/NO gas mixtures. A very short duration (60 ns) photo-triggered discharge is used to create a homogeneous plasma at a total pressure between 230 and 460 mbar. Measurements of the NO density are performed in the afterglow by time-resolved laser-induced fluorescence, for a time scale between 2 and 200 µs after the current pulse excitation. Plasma homogeneity allows effective comparison between experimental results and predictions of a fully self-consistent discharge and kinetic modelling. It is shown that the NO removal efficiency is mainly determined through loss mechanisms balance for nitrogen metastable singlet states. In the absence of H 2 O, NO is in great part dissociated owing to collisions with singlet states. When water vapour is added, these states are destroyed through collisions with H 2 O with a rate constant k = (3.0±1.5)×10 -10 cm 3 s -1 , and it leads to the decrease of the NO removal efficiency. This reaction is invoked for the first time.
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Fresnet et al. (2002) studied this question.
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