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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA15-04023S" target="_blank" >GA15-04023S: Pokročilý výzkum kinetických procesů ve streamerových výbojích</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics D-Applied Physics

ISSN

0022-3727

e-ISSN

—

Svazek periodika

50

Číslo periodika v rámci svazku

50

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000416005900001

EID výsledku v databázi Scopus

2-s2.0-85038212873