Evolution of N2(A3Σ+u) in streamer discharges: influence of oxygen admixtures on formation of low vibrational levels.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00483130" target="_blank" >RIV/61389021:_____/17:00483130 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1361-6463/aa96f3" target="_blank" >http://dx.doi.org/10.1088/1361-6463/aa96f3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/aa96f3" target="_blank" >10.1088/1361-6463/aa96f3</a>

Result language

angličtina

Original language name

Evolution of N2(A3Σ+u) in streamer discharges: influence of oxygen admixtures on formation of low vibrational levels.

Original language description

The formation of N-2(A(3)Sigma(+)(u)) metastable species, produced by cathode-directed streamer discharge, was investigated using the technique of laser-induced fluorescence. A triggered single streamer filament was periodically produced in pure nitrogen (and in nitrogen with admixtures of oxygen) at total pressure of 50 Torr and metastable species were monitored during the streamer channel decay in the centre of the discharge gap.nWe revealed the dynamics of individual vibrational (v = 0-8) levels of N-2(A(3)Sigma(+)(u)) for various oxygen admixtures (0-20%). In pure nitrogen, the observed evolution of the N-2(A(3)Sigma(+)(u)) during the decaying streamer channel is evidence of initial vibrational relaxation of high vibrational levels towards the v = 2 and 3 levels, followed by a delayed increase of terminal (v = 0, 1) levels. A calibration procedure based on the rate of energy-pooling processes was used to place all detected vibronic levels in pure nitrogen on the absolute scale. Population maxima exceeding 1 x 10(14) cm(-3) were fixed for the v = 2 and 3 vibrational levels, while the lowest v = 0 level reaches only 3 x 10(13) cm(-3).nPopulations of v = 2-5 vibrational levels were also estimated for N-2 + O-2 mixtures after scaling of laser-induced fluorescence signals obtained at various oxygen admixtures. The total N-2(A(3)Sigma(+)(u)) population in an air-like mixture is formed mainly by v = 3-4 vibronic levels with the population maximum of similar to 3 x 10(13) cm(-3) fixed at the shortest analyzed delay. This observation, together with the fact that we were unable to detect v = 0 and 1 levels (fluorescence signals below detection threshold), gives a strong evidence of the inhibition of Delta v = 2 vibrational relaxation towards terminal v = 0 and 1 levels, causing much lower populations of the lowest v = 0-1 levels.n

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA15-04023S" target="_blank" >GA15-04023S: Advanced Research of Kinetic Processes in Streamer Discharges</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics D-Applied Physics

ISSN

0022-3727

e-ISSN

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Volume of the periodical

50

Issue of the periodical within the volume

50

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

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UT code for WoS article

000416005900001

EID of the result in the Scopus database

2-s2.0-85038212873