The Influence of Gas Pressure on the H{sub {alpha}} Line Shape in the Gap of Dielectric Barrier Discharge Generated in Helium--Hydrogen Gas Mixtures
- Institute of Physics, Opole University, ul. Oleska 48, 45-052 Opole (Poland)
In a gas mixture consisting of 99.5% of helium and 0.5% of molecular hydrogen, dielectric barrier discharges are generated by applying AC voltage to two electrodes, deposited on the outward surfaces of the ceramic plates. The two ceramic plates made of BaTiO{sub 3} form a slit-like discharge gap of 0.5 mm (distance between the inward ceramic surfaces). The radiation of the hydrogen H{sub {alpha}} spectral line emitted from this gas gap is studied, applying gas pressures from 4 kPa to 60 kPa. The H{sub {alpha}} line shapes emitted from this gap are measured with spectral and spatial resolution (in the direction perpendicular to the ceramic surface). The light detection system, equipped with a chopper (synchronized with the feeding voltage) allows light polarization sensitive measurements to be performed. The observed large broadening of the H{sub {alpha}} profile is attributed mainly to the linear Stark effect. On the basis of analyzed H{sub {alpha}} line shapes the electric field strengths in the gas gap at different pressures are determined.
- OSTI ID:
- 21136922
- Journal Information:
- AIP Conference Proceedings, Vol. 993, Issue 1; Conference: PLASMA 2007: International conference on research and applications of plasmas; 4. German-Polish conference on plasma diagnostics for fusion and applications; 6. French-Polish seminar on thermal plasma in space and laboratory, Greifswald (Germany), 16-19 Oct 2007; Other Information: DOI: 10.1063/1.2909126; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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