Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2(C3Piu) and N2+(B2Sigmau+) emissions and fundamental streamer structure

HODER, Tomáš, Zdeněk BONAVENTURA, Anne BOURDON and Milan ŠIMEK. Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2(C3Piu) and N2+(B2Sigmau+) emissions and fundamental streamer structure. Journal of Applied Physics. 2015, vol. 117, No 7, p. "nestránkováno", 13 pp. ISSN 0021-8979. Available from: https://dx.doi.org/10.1063/1.4913215.

Basic information

• Original name: Sub-nanosecond delays of light emitted by streamer in atmospheric pressure air: Analysis of N2(C3Piu) and N2+(B2Sigmau+) emissions and fundamental streamer structure
• Authors: HODER, Tomáš (203 Czech Republic, guarantor, belonging to the institution), Zdeněk BONAVENTURA (203 Czech Republic, belonging to the institution), Anne BOURDON (250 France) and Milan ŠIMEK (203 Czech Republic).
• Edition: Journal of Applied Physics, 2015, 0021-8979.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10305 Fluids and plasma physics
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• WWW: http://scitation.aip.org/content/aip/journal/jap/117/7/10.1063/1.4913215
• Impact factor: Impact factor: 2.101
• RIV identification code: RIV/00216224:14310/15:00082398
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1063/1.4913215
• UT WoS: 000351130900005
• Keywords in English: streamer; electric field; amospheric pressure; excited sates; emission spectra
• Tags: AKR, rivok

Abstract

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-ofpicoseconds and tens-of-microns precision, it is shown that when the streamer head passes a spatial coordinate, emission maxima from N2 and N+2 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 N+2 . 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. In contrast to the highly nonlinear behavior of streamer events, it is shown theoretically that emission maximum delays linearly depend on the ratio of the streamer radius and its velocity. This is found to be one of the fundamental streamer features and its use in streamer head diagnostics is proposed. Moreover, radially resolved spectra are synthesized for selected subsequent picosecond moments in order to visualize spectrometric fingerprints of radial structures of N2(C3Piu) and N+2 (B2Sigma+u) populations created by streamer-head electrons.

Links

• ED2.1.00/03.0086, research and development project: Name: Regionální VaV centrum pro nízkonákladové plazmové a nanotechnologické povrchové úpravy
• LO1411, research and development project: Name: Rozvoj centra pro nízkonákladové plazmové a nanotechnologické povrchové úpravy (Acronym: CEPLANT plus)

Investor: Ministry of Education, Youth and Sports of the CR