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Progress in Plasma Processing of Materials, 1999

ISBN:
1-56700-126-2 (Print)

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
Laboratoire des Procedes, Materiaux et Energie Solaire, PROMES-CNRS UPR 8521, 7 rue du Four solaire, 66120 Font Romeu-Odeillo, 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 ionisation degree (ξ), population of excited sodium atoms, electric reduced field strength, vibration temperature of nitrogen molecules) are elucidated.