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Streamer-induced kinetics of excited states in pure N2: I. Propagation velocity, E / N and vibrational distributions of N2(C3Πu) and N2+(B2Σu+) states
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SYSNO ASEP 0580536 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Streamer-induced kinetics of excited states in pure N2: I. Propagation velocity, E / N and vibrational distributions of N2(C3Πu) and N2+(B2Σu+) states Author(s) Bílek, Petr (UFP-V) ORCID
Dias, T. C. (PT)
Prukner, Václav (UFP-V) RID, ORCID
Hoffer, Petr (UFP-V) RID
Guerra, V. (PT)
Šimek, Milan (UFP-V) RID, ORCIDNumber of authors 6 Article number 105002 Source Title Plasma Sources Science & Technology. - : Institute of Physics Publishing - ISSN 0963-0252
Roč. 32, č. 10 (2023)Number of pages 19 s. Language eng - English Country US - United States Keywords energy-pooling reactions ; atmospheric-pressure ; barrier discharge ; induced emission ; excitation ; system ; air ; dielectric barrier discharge ; molecular nitrogen ; second positive system of N-2 ; streamer discharge ; vibrational distributions Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA15-04023S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 001084363500001 EID SCOPUS 85175004211 DOI 10.1088/1361-6595/acf9c8 Annotation The emission spectra of a streamer discharge in pure nitrogen provide an important tool for investigating the fundamental kinetics of excited electronic states of N2 and benchmark data for validating advanced kinetic schemes for numerical models. In this work, we characterize a streamer monofilament developed in a dielectric barrier discharge configuration, including electrical characteristics, time-resolved images and N2/N 2+ emission spectra, all acquired with nanosecond temporal resolution. Time-resolved images and emission characteristics provide clear evidence of the formation of a cathode-directed streamer and allow determining the streamer propagation velocity and the typical E/N values using the intensity ratio of nitrogen spectral bands in the center of the discharge gap. We also measure the vibrational distributions of the N-2(C-3 Pi(u) , nu= 0-4) and N-2(+) (B-2 Sigma(+)(u) , nu= 0-2) states. The population of N-2(C-3 Pi u , nu= 0-4) state, initially formed by energetic electrons in the streamer head, changes later significantly due to the decrease in the mean energy and concentration of the streamer channel electrons. After a few tens of nanoseconds, the electron-impact excitation rate of N-2(C3 Pi(u) ) becomes negligible compared to its population by the N-2( A(3)Sigma(+)(u) ) + N-2( A(3)Sigma(+)(u) ) pooling. The experimental findings are supported and consistent with the 0D state-to-state kinetic model results and reveal the participation of high vibrational levels of N-2(A(3)Sigma(+)(u) ) in the pooling reactions. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://iopscience.iop.org/article/10.1088/1361-6595/acf9c8
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