Study of fast gas heating in a capillary nanosecond discharge in air. TALIF O atoms measurements and kinetic modeling.

Measurements of discharge parameters, namely of the electric current, electric filed and energy deposition, have been obtained for a nanosecond discharge (20 kV amplitude and 30 ns duration) in air flow in a capillary for a pressure range 16-60 mbar. Rotational temperature has been measured in the discharge and near afterglow using emission of the second positive system of molecular nitrogen excited by additional pulses. TALIF technique was adjusted and preliminary measurements of O-atoms density were performed. A set of discharge and afterglow reactions was suggested to describe the kinetics of fast gas heating in the near (a few microseconds) afterglow of the discharge. It was shown that theoretical calculations of gas temperature correlate well with the obtained experimental values for the first two pulses, although measured data for oxygen atoms density are significantly lower than theoretically predicted values.

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