NDLI: Experiments of vacuum uv absorption during low-temperature plasma formation at atmospheric pressure

Content Provider	IEEE Xplore Digital Library
Author	Laity, G. Fierro, A. Hatfield, L. Neuber, A. Frank, K.
Copyright Year	2012
Description	Author affiliation: Center for Pulsed Power and Power Electronics, Departments of Electrical Engineering and Physics, Texas Tech University, Lubbock, 79409, USA (Laity, G.; Fierro, A.; Hatfield, L.; Neuber, A.) \|\| Erlangen Centre for Astroparticle Physics, Department of Physics, Friedrich - Alexander University at Erlangen - Nürnberg, 91058, Germany (Frank, K.)
Abstract	There has been a continued interest in utilizing streamer and spark discharges for new technologies which require low temperature plasma generation at atmospheric pressure. One key area of study is the role of photon dominated processes, such as ionization and dissociation, as a result of emission and re-absorption of vacuum UV radiation (e.g. photons with energies greater than 8 eV). This experiment consists of a triggered surface flashover event along a dielectric surface between two point-point electrodes, where spectral measurements are performed in the vacuum UV regime (i.e. 115 – 175 nm). Previous studies of air breakdown alluded to a cross-species photon absorption process between N and O molecules, and a later study revealed an impurity in the form of HI Lyman-α radiation in spark discharges in air. In an effort to understand the self-absorption of this radiation at atmospheric pressure, a basic study was performed in various N mixtures in a controlled environment. Spectral measurements were taken via intensified CCD devices in the VUV range, photomultiplier electronics with accompanying electrical diagnostics, and external imaging with nano-second resolution. It was concluded from the experiments that significant self-absorption of HI radiation is occurring during plasma formation at electron temperatures of ∼10 eV, and detailed spectral line-fitting showed that the parameters which define absorption vary as a function of distance from the anode (i.e. where the streamers originate due to the geometry in this experiment). Therefore, rough estimates can be made of parameters such as H dissociation percentage (as much as $10^{−3}$ in the plasma channel) and electron density (upwards of $10^{19}$ $cm^{−3}$ in the spark phase) as a function of position between the electrodes. These studies elucidate the plasma kinetics (specifically absorption) which occurs during the transition from streamer to spark discharge at atmospheric pressure.
File Size	109698
File Format	PDF
ISBN	9781457721274
ISSN	07309244
e-ISBN	9781457721298
e-ISBN	9781457721281
DOI	10.1109/PLASMA.2012.6383426
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-08
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Sparks Physics Discharges (electric) Photonics Absorption Educational institutions
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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