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高温材料处理:国际期刊
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN 打印: 1093-3611
ISSN 在线: 1940-4360

高温材料处理:国际期刊

DOI: 10.1615/HighTempMatProc.v14.i4.60
pages 367-372

INFLUENCE OF MOLECULAR NITROGEN ON THE CONDUCTIVITY OF A LASER-INDUCED PLASMA IN AN NA+AR+N2 MIXTURE

N. A. Gorbunov
Physics Institute of St.-Petersburg State University, Ulianovskaya 1, 198904 St.-Petersburg, Russia *ENISE, 58 rue Jean Parot, 42023 St.-Etienne, France
A. S. Melnikov
Physics Institute, St. Petersburg University, Ulianovskaya 1,198904, St. Petersburg, Russia *ENISE, 58 rue Jean Parot, 42023 St.-Etienne, France
I. Yu. Smurov
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex; Ecole Nationale d'Ingenieurs de Saint-Etienne, 58 rue Jean Parot, 42023 Saint -Etienne Cedex 2, France
Gilles Flamant
CNRS PROMES UPR 8521, Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France

ABSTRACT

The present work is focused on parametric computations of electron energy distribution function (EEDF) and electron mobility in resonant photo-plasma of sodium mixed with argon and molecular nitrogen. The conditions of a weak external electric field are considered, when electron heating is provided by collisions of the second kind with excited sodium atoms. It is shown that the non-equilibrium shape of the EEDF arising in this mixture can considerably affect electron mobility. It is demonstrated that under certain conditions the mobility may have negative values. The critical plasma parameters (partial pressure of mixture components, plasma ionization degree (ε), population of excited sodium atoms, electric reduced field strength, vibration temperature of nitrogen molecules) are elucidated.

REFERENCES

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  2. Alexandrov, N. L., Dem'yanov, A. V., and Kotchetov, I. V. , Possibility of negative differential plasma conductivity in two intervals of the electric field values.

  3. Gorbunov, N. A., Melnikov, A. S., and Movtchan, I. A. , On the anomalously low conductivity of a resonant laser-induced plasma of sodium vapor—argon mixtures.

  4. Gorbunov, N. A., Latyshev, Ph. E., Melnikov, A. S., Movtchan, I. A., and Smurov, I. , Influence of electron-electron collisions on electron mobility in plasma of alkali metals— inert gas mixtures.