Publication detail

Pressure Dependence of the DC Nitrogen Pink Afterglow

KRČMA, F. MAZÁNKOVÁ, V. ŽÁKOVÁ, M. SOURAL, I.

Original Title

Pressure Dependence of the DC Nitrogen Pink Afterglow

English Title

Pressure Dependence of the DC Nitrogen Pink Afterglow

Type

conference paper

Language

en

Original Abstract

The nitrogen pink afterglow phenomenon is studied for more than 50 years. Different discharge configurations with DC, MW of RF power sources have been studied up to now. Based on the experimental data, the kinetic models of the post-discharge kinetics were developed, too. But up to now, there was not done any comparative study of pressure influence on this phenomenon. This is the aim of our contribution. The experimental results were obtained in flowing DC post-discharge in pure nitrogen (purity better than 99.999%). The gas pressure measured by capacitance gauge was varied in the range of 500 - 5000 Pa at a constant discharge power of 290 W. The gas velocity through Pyrex tube (i.d. 13 mm) was fixed at 4.7 m/s and 11 m/s. The optical emission spectra in the range 315 - 780 nm were recorded during the post-discharge up to 140 ms and 45 ms with better time resolution, respectively. The experimental results showed that the maximal intensity of the pink afterglow as well as the decay time then this maximal intensity was observed were strongly dependent on the pressure. The maximal intensity of pink afterglow was observed at a pressure of 1000 Pa at the decay time of 6 ms. To verify the wall temperature influence on the pink afterglow creation the set of experiments at higher gas velocity was performed. The reactor was cooled down to 77 K around the point where the optical spectra were collected. The results showed that wall temperature significantly changes the pink afterglow appearance.

English abstract

The nitrogen pink afterglow phenomenon is studied for more than 50 years. Different discharge configurations with DC, MW of RF power sources have been studied up to now. Based on the experimental data, the kinetic models of the post-discharge kinetics were developed, too. But up to now, there was not done any comparative study of pressure influence on this phenomenon. This is the aim of our contribution. The experimental results were obtained in flowing DC post-discharge in pure nitrogen (purity better than 99.999%). The gas pressure measured by capacitance gauge was varied in the range of 500 - 5000 Pa at a constant discharge power of 290 W. The gas velocity through Pyrex tube (i.d. 13 mm) was fixed at 4.7 m/s and 11 m/s. The optical emission spectra in the range 315 - 780 nm were recorded during the post-discharge up to 140 ms and 45 ms with better time resolution, respectively. The experimental results showed that the maximal intensity of the pink afterglow as well as the decay time then this maximal intensity was observed were strongly dependent on the pressure. The maximal intensity of pink afterglow was observed at a pressure of 1000 Pa at the decay time of 6 ms. To verify the wall temperature influence on the pink afterglow creation the set of experiments at higher gas velocity was performed. The reactor was cooled down to 77 K around the point where the optical spectra were collected. The results showed that wall temperature significantly changes the pink afterglow appearance.

Keywords

nitrogen pink afterglow, post-discharge kinetics, pressure dependence

RIV year

2009

Released

29.06.2009

Publisher

EPS

Location

Sofia

ISBN

2-914771-61-4

Book

Proceedings of 36th European Physical Society Conference on Plasma Physics

Pages from

P2-126-1

Pages to

P2-126-4

Pages count

4

BibTex


@inproceedings{BUT30596,
  author="František {Krčma} and Věra {Mazánková} and Marie {Žáková} and Ivo {Soural}",
  title="Pressure Dependence of the DC Nitrogen Pink Afterglow",
  annote="The nitrogen pink afterglow phenomenon is studied for more than 50 years. Different discharge configurations with DC, MW of RF power sources have been studied up to now. Based on the experimental data, the kinetic models of the post-discharge kinetics were developed, too. But up to now, there was not done any comparative study of pressure influence on this phenomenon. This is the aim of our contribution. 
The experimental results were obtained in flowing DC post-discharge in pure nitrogen (purity better than 99.999%). The gas pressure measured by capacitance gauge was varied in the range of 500 - 5000 Pa at a constant discharge power of 290 W. The gas velocity through Pyrex tube (i.d. 13 mm) was fixed at 4.7 m/s and 11 m/s. The optical emission spectra in the range 315 - 780 nm were recorded during the post-discharge up to 140 ms and 45 ms with better time resolution, respectively. The experimental results showed that the maximal intensity of the pink afterglow as well as the decay time then this maximal intensity was observed were strongly dependent on the pressure. The maximal intensity of pink afterglow was observed at a pressure of 1000 Pa at the decay time of 6 ms. To verify the wall temperature influence on the pink afterglow creation the set of experiments at higher gas velocity was performed. The reactor was cooled down to 77 K around the point where the optical spectra were collected. The results showed that wall temperature significantly changes the pink afterglow appearance.",
  address="EPS",
  booktitle="Proceedings of 36th European Physical Society Conference on Plasma Physics",
  chapter="30596",
  howpublished="electronic, physical medium",
  institution="EPS",
  year="2009",
  month="june",
  pages="P2-126-1--P2-126-4",
  publisher="EPS",
  type="conference paper"
}