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Citation: ZHANG Lian-Shui, WANG Bai-Rong, DANG Wei, XIAO Guang-Chang-Sheng. Excited Dissociation Kinetics of H₂O by Pulsed Streamer Discharge[J]. Acta Physico-Chimica Sinica, ;2008, 24(08): 1524-1528. doi: 10.3866/PKU.WHXB20080834 shu

Excited Dissociation Kinetics of H₂O by Pulsed Streamer Discharge

1.
College of Physics Science and Technology, Hebei University, Baoding 071002, Hebei Province, P. R. China

Received Date: 18 January 2008
Available Online: 12 May 2008

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.
- Pulse streamer discharge; Excited dissociation kinetics process; Disperse fluorescence spectrum; Temporal-resolved spectrum; Spatial-resolved spectrum
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沈阳化工大学材料科学与工程学院沈阳 110142

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Excited Dissociation Kinetics of H2O by Pulsed Streamer Discharge

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Excited Dissociation Kinetics of H₂O by Pulsed Streamer Discharge