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Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2( C3Πu) and N2+(B2Σ u +) emissions and fundamental streamer structure
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SYSNO ASEP 0443590 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2( C3Πu) and N2+(B2Σ u +) emissions and fundamental streamer structure Author(s) Hoder, T. (CZ)
Bonaventura, Z. (CZ)
Bourdon, A. (FR)
Šimek, Milan (UFP-V) RID, ORCIDSource Title Journal of Applied Physics. - : AIP Publishing - ISSN 0021-8979
Roč. 117, č. 7 (2015), 073302-073302Number of pages 13 s. Publication form Print - P Language eng - English Country US - United States Keywords streamer ; optical diagnostics ; nitrogen ; emission Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GAP205/12/1709 GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000351130900005 EID SCOPUS 84923326631 DOI 10.1063/1.4913215 Annotation Theoretical analysis of ultra-short phenomena occurring during the positive streamer propagation in atmospheric pressure air is presented. Motivated by experimental results obtained with tens-of-picoseconds and tens-of-microns precision, it is shown that when the streamer head passes a spatial coordinate, emission maxima from N2 and N2+ radiative states follow with different delays. These different delays are caused by differences in the dynamics of populating the radiative states, due to different excitation and quenching rates. Associating the position of the streamer head with the maximum value of the self-enhanced electric field, a delay of 160 ps was experimentally found for the peak emission of the first negative system of N2+. A delay dilatation was observed experimentally on early-stage streamers and the general mechanism of this phenomenon is clarified theoretically. In the case of the second positive system of N2, the delay can reach as much as 400 ps. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2016
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