An experimental study on the influence of trace impurities on ionization of atmospheric noble gas dielectric barrier discharges.
An experimental study on the influence of trace impurities on ionization of atmospheric noble gas dielectric barrier discharges.
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DOI：
10.1039/c6an01352j
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
F. Klute;A. Schütz;A. Michels;C. Vadla;D. Veẑa;V. Horvatić;J. Franzke
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文献类型：
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作者：
F. Klute;A. Schütz;A. Michels;C. Vadla;D. Veẑa;V. Horvatić;J. Franzke
虽然微量杂质对惰性气体放电的影响已经在理论工作中得到了很好的证实，但实验方法是困难的。特别是微量氮气浓度对氦放电的影响很难研究，因为对于氦5.0，氦的纯度只有99.999%。这相当于氦气中10ppm的残留浓度，其中3ppm的氮气。由于DBD等离子体通常在环境大气中运行，这一事实使问题变得困难，环境大气中的氮气丰度很高。这项工作从两个方面解决了这些问题。第一种方法是在准可控氦大气下运行DBD等离子体，从而减少大气中氮气的影响，并使定义的氮气污染成为可能。第二种方法是以Ar为工作气体，引入丙烷(C3H8)作为合适的替代杂质，如氦气中的氮气。如将显示的，在He或Ar中的两种放电及其各自的杂质表现出相同的质量行为。
While the influence of trace impurities in noble gas discharges is well established in theoretical work, experimental approaches are difficult. Particularly the effects of trace concentrations of N2 on He discharges are complicated to investigate due to the fact that for He 5.0 the purity of He is only 99.999%. This corresponds to a residual concentration of 10 ppm, thereof 3 ppm of N2, in He. Matters are made difficult by the fact that He DBD plasmajets are normally operated under an ambient atmosphere, which has a high abundance of N2. This work tackles these problems from two sides. The first approach is to operate a DBD plasmajet under a quasi-controlled He atmosphere, therefore diminishing the effect of atmospheric N2 and making a defined contamination with N2 possible. The second approach is using Ar as the operating gas and introducing propane (C3H8) as a suitable substitute impurity like N2 in He. As will be shown both discharges in either He or Ar, with their respective impurity show the same qualitative behaviour.