Abstract
The excitation of N2 (C 3u, v = 0) and N+2 (B 2+u, v = 0) electron states has been studied by using a time-resolved emission spectroscopy technique. To excite the above states, the nanosecond, high-voltage, periodic impulsed discharge at low pressures in the form of the fast ionization wave (FIW) was used. The electron concentration and the average energy, electric field were found on the basis of experimental data. The spacial-temporal structure of the FIW front was investigated. It has been shown that the generation of the required electron concentration, as well as the electron level population take place behind the FIW front in residual fields. Sections corresponding to the `electric' and `luminous' FIW fronts are essentially separated in space. The proposed modelling electron energy distribution function describes qualitatively general regularities of the breakdown propagation in the whole range of parameters under study.
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