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MAZÁNKOVÁ, V. KRČMA, F. TRUNEC, D.
Original Title
Study of Argon Flowing Afterglow with Nitrogen Injection Study of Argon Flowing Afterglow with Nitrogen Injection
Type
journal article - other
Language
English
Original Abstract
In this work the reaction kinetics in argon flowing afterglow with nitrogen addition was studied by optical emission spectroscopy. The DC flowing post-discharge in pure argon was created in quartz tube at the total gas pressure of 1000~Pa and discharge power of 60~W. The nitrogen was added into the afterglow at the distance of 9 cm behind the active discharge. The optical emission spectra were measured along the flow tube. The argon spectral lines and after nitrogen addition also nitrogen second positive system (SPS) were identified in the spectra. The measurement of spatial dependence of SPS intensity showed a very slow decay of the intensity and the decay rate did not depend on the nitrogen concentration. In order to explain this behavior a kinetic model for reaction in afterglow was developed. This model showed that C3Pi_u state of molecular nitrogen, which is the upper state of SPS emission, is produced by excitation transfer from argon metastables to nitrogen molecules. However, the argon metastables are also produced at Ar_2^+ ion recombination with electrons and this limits the decay of argon metastable concentration and it results in very slow decay of SPS intensity.
Keywords
rate coefficient, argon post-discharge, nitrogen, optical emission spectroscopy, resonant energy transfer
Authors
MAZÁNKOVÁ, V.; KRČMA, F.; TRUNEC, D.
RIV year
2013
Released
7. 11. 2013
Publisher
AIP Publishing LLC
Location
New York
ISBN
0021-9606
Periodical
The Journal of Chemical Physics
Year of study
139
Number
16
State
United States of America
Pages from
164311-1
Pages to
164311-6
Pages count
6