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Emission spectra of a pulse needle-to-plane corona-like discharge in conductive aqueous solution
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SYSNO ASEP 0381679 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Emission spectra of a pulse needle-to-plane corona-like discharge in conductive aqueous solution Author(s) Šimek, Milan (UFP-V) RID, ORCID
Člupek, Martin (UFP-V) RID
Babický, Václav (UFP-V) RID
Lukeš, Petr (UFP-V) RID, ORCID
Šunka, Pavel (UFP-V) RIDSource Title Plasma Sources Science & Technology. - : Institute of Physics Publishing - ISSN 0963-0252
Roč. 21, č. 5 (2012), 055031-055031Number of pages 12 s. Publication form web - web Language eng - English Country GB - United Kingdom Keywords Water ; pulsed electrical breakdown ; point-plane geometry ; streamer propagation ; corona discharge ; emission spectroscopy Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects IAAX00430802 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000309590200034 DOI 10.1088/0963-0252/21/5/055031 Annotation We explored basic optical and electrical characteristics of a positive corona-like discharge produced in conductive aqueous solutions by periodic high-voltage pulses. Emission spectra of the discharge were acquired in a needle-to-plate electrode geometry and analyzed in the UV-vis-NIR spectral range with nanosecond time resolution for the solution conductivity of 100 and 500 mS/cm. The most important emission features are due to electronic excitation of HI, OI, OII and OH species. We have found evidence of significant time-dependent line-shape broadening of selected HI and OI transitions. The observed broadening is attributed to the dynamic Stark and pressure broadening mechanisms and significantly increases with the aqueous solution conductivity. Electron densities were estimated by fitting a single Voigt peak function to observed Hđ profiles, and reach as much as ne 4x1018 cm-3 (tD = 300 ns at 100 mS/cm solution) and ne 51018 cm-3 (tD = 1 ms at 500 mS/cm). Temporal evolution of the partially-resolved rotational structure of the OH emission reaches a maximum during the discharge decay, with the onset significantly delayed with respect to the streamer ignition. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2013
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