Collisional deactivation of N_2(C~3Π_u) and N_2~+(B~2∑_u~+) by hydrocarbon molecules in afterglow of the picosecond discharge

摘要

In this paper the dynamics of the nitrogen electronic state relaxation is investigated by the emission spectroscopy of high time resolution in afterglow of the picosecond pulse repetitive high-voltage dis- charge in the form of fast ionization wave FIW. From the viewpoint of elementary process studies, the most promising features of such a breakdown are the spatial uniformity, good reproducibility and short periods of time required for gas excitation [1-7]. FIW was initiated by negative polarity voltage impulses of 150 kV amplitude. The pulses have 250 ps duration at half amplitude, 100 ps rise time and 10 Hz repetition frequency. The pulses were delivered from a high-voltage pulser to the high-voltage electrode of the discharge cell through a coaxial cable with an impedance of 50 Ohm (Figure 1).