Characterization of a direct dc-excited discharge in water by optical emission spectroscopy
作者： Peter Bruggeman , Daan Schram , Manuel Á González , Robby Rego , Michael G Kong
DOI: 10.1088/0963-0252/18/2/025017
关键词: Atomic physics 、 Rotational temperature 、 Stark effect 、 Emission spectrum 、 Chemistry 、 Streamer discharge 、 Hydrogen 、 Population 、 Electron density 、 Bubble
摘要: Dc-excited discharges generated in water at the tip of a tungsten wire which is located orifice quartz capillary are investigated by time-averaged optical emission spectroscopy.Two distinctive discharge modes observed. For small conductivities liquid streamer-like itself (liquid mode). above typically 45 µS cm−1 large vapour bubble formed and streamer this observed (bubble mode).Plasma temperatures electron densities for both modes. The gas temperature estimated from rotational N2(C–B) 1600 ± 200 K mode 1900 mode. OH(A–X) up to 2 times larger cannot be used as an estimate temperature. population distribution OH(A), ν = 0 also non-Boltzmann with overpopulation high states. This discrepancy discussed detail.Electron obtained Stark broadening hydrogen Balmer beta line. order 1021 m−3. In significantly smaller: (3–4) × 1020 m−3. These values compared alpha gamma lines current density measurements. chemical reactivities means peroxide production rate.
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