Pressure Dependence of the DC Nitrogen Pink Afterglow

conference paper

English

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.

nitrogen pink afterglow, post-discharge kinetics, pressure dependence

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

2009

29. 6. 2009

EPS

Sofia

2-914771-61-4

Proceedings of 36th European Physical Society Conference on Plasma Physics

P2-126-1

P2-126-4

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