Determination of the Nitrogen Atom Wall Recombination Probability in Late Afterglow

Determination of the Nitrogen Atom Wall Recombination Probability in Late Afterglow

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The reaction kinetics in nitrogen flowing afterglow was studied by optical emission spectroscopy. The DC flowing post-discharge in pure nitrogen was created in a quartz tube at the total gas pressure of 1000 Pa and discharge power of 130 W. The optical emission spectra were measured along the flow tube. Three nitrogen spectral systems - the first positive, the second positive, and the first negative were identified. It was found that N atoms are the most important particles in this late nitrogen afterglow, their volume recombination starts a chain of reactions which produce exited states of molecular nitrogen. In order to explain the decrease of N atom concentration, it was also necessary to include the surface recombination of N atoms to the model. The surface recombination was considered as a first order reaction and wall recombination probability γ = (2.16 ± 0.07) × 10-6 was determined from the experimental data.

The reaction kinetics in nitrogen flowing afterglow was studied by optical emission spectroscopy. The DC flowing post-discharge in pure nitrogen was created in a quartz tube at the total gas pressure of 1000 Pa and discharge power of 130 W. The optical emission spectra were measured along the flow tube. Three nitrogen spectral systems - the first positive, the second positive, and the first negative were identified. It was found that N atoms are the most important particles in this late nitrogen afterglow, their volume recombination starts a chain of reactions which produce exited states of molecular nitrogen. In order to explain the decrease of N atom concentration, it was also necessary to include the surface recombination of N atoms to the model. The surface recombination was considered as a first order reaction and wall recombination probability γ = (2.16 ± 0.07) × 10-6 was determined from the experimental data.

OES, nitrogen afterglow, recombination probability

OES, nitrogen afterglow, recombination probability

MAZÁNKOVÁ, V.; TRUNEC, D.; KRČMA, F.

2016

17.01.2015

Comenius University

Bratislava

978-80-8147-027-1

20th Symposium on Application of Plasma Processes & COST TD1208 Workshop on Application of Gaseous Plasma with Liquids – Book of Contributed Papers

200

203

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