NDLI: Dark phase effect in the evolution of the positive column of a glow discharge in nitrogen

Content Provider	Springer Nature Link
Author	Dyatko, N. A. Ionikh, Yu. Z. Meshchav, A. V. Napartovich, A. P. Shishpav, A. I.
Copyright Year	2011
Abstract	The characteristics of the initial stage of the formation of the positive column of a glow discharge in nitrogen at reduced pressures are studied experimentally and numerically. A dip in the plasma emission intensity in the initial stage of the discharge (the so-called “dark phase”) is observed experimentally at the positive polarity of the high-voltage electrode (the cathode is grounded). The dark phase is preceded by an ionization wave (IW). When the anode is grounded, neither an IW nor a dip in the discharge emission intensity are observed. A theoretical model capable of describing the discharge development under the actual experimental conditions is constructed. It is shown that the dark phase effect may be caused by the high electron density (above the steady-state one) produced in the gas during the passage of the IW across the discharge gap. This mechanism of the dark phase formation differs from the mechanism proposed earlier to explain a similar effect in noble gases. Additional experiments carried out with pure argon, helium, and helium with a nitrogen admixture have shown that, in the case of a grounded cathode, gas breakdown is also accompanied by the passage of an IW, whereas in the case of a grounded anode, no IW is observed; however, the dark phase is present in both cases. It is shown using computer simulations that, in nitrogen (in contrast to noble gases), the mechanism resulting in the dark phase effect does not operate in the absence of an IW.
Starting Page	505
Ending Page	520
Page Count	16
File Format	PDF
ISSN	1063780X
Journal	Plasma Physics Reports
Volume Number	37
Issue Number	6
e-ISSN	15626938
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-06-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atomic, Molecular, Optical and Plasma Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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