Determination of the Nitrogen Atom Wall Recombination Probability in Late Afterglow

conference paper

English

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

MAZÁNKOVÁ, V.; TRUNEC, D.; KRČMA, F.

2015

17. 1. 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

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