Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (08): 1524-1528.doi: 10.3866/PKU.WHXB20080834

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Excited Dissociation Kinetics of H2O by Pulsed Streamer Discharge

ZHANG Lian-Shui; WANG Bai-Rong; DANG Wei; XIAO Guang-Chang-Sheng   

  1. College of Physics Science and Technology, Hebei University, Baoding 071002, Hebei Province, P. R. China
  • Received:2008-01-18 Revised:2008-04-15 Published:2008-08-06
  • Contact: ZHANG Lian-Shui

Abstract: The methods of the disperse fluorescence, temporal-resolved spectrum and spatial-resolved spectrum were used to study the excited dissociation kinetics of N2/H2O gas in the pulsed streamer discharge plasma at the standared atmospheric pressure (1.013×105 Pa). The main spectra detected in the experiment are assigned to C3∏u→B3∏g for N2, A2∑+→X2∏ for·OH radical, and (n=3→n=2) for H atom, respectively. The temporal-resolved measurements at 337.2, 308.4, 656.5 nm showed that the occurrences of·OH* and H* were 7.4 ns and 17.6 ns later than that of N2* respectively. So the dissociation process of H2O can be described as that H2O is excited to high vibrational level of the first excited state by non-elasticity collision with electron, and then dissociates to·OH* radical at excited state and H atom at ground state. Furthermore, spatial-resolved measurements showed that the densities of active particles reached the maximum at 0.5 mm away from negative electrode corresponding to the negative glow region of streamer discharge, where the maxima of electron temperature and density were helpful to the formation of these active particles.

Key words: Pulse streamer discharge, Excited dissociation kinetics process, Disperse fluorescence spectrum, Temporal-resolved spectrum, Spatial-resolved spectrum


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