Influence of power supply modes on the optical emission dynamics of atmospheric pressure glow discharge in magnesium atom flow generation mode
K.P. Savkin, D.A. Sorokin, D.V. Beloplotov, A.G. Nikolaev, M.V. Shandrikov, A.A. Cherkasov, V.I. Gushenets, A.S. Bugaev, U.V. Khomutova, D.Yu. Ignatov
High Current Electronics Institute of the Siberian Branch of the RAS, Tomsk, Russia
Keywords: atmospheric pressure discharge, gas discharge plasma, metal atom, metal ion, optical spectroscopy, nanoparticle
Abstract
The dynamics and spatial distribution of atmospheric pressure glow discharge plasma radiation in an argon flow in the plasma generation mode with metal particles is studied. The discharge system consisted of two symmetrical tantalum crucible-electrodes with inserts of a low-melting metal (magnesium) and operated at a current of 100-600 mA, a relatively high discharge voltage of 150 to 200 V, and an argon flow rate of 1-3 L/min, without changing to spark or arc discharge modes. Such parameters ensured the stable generation of magnesium atom fluxes in the discharge plasma, resulting from discharge initiation in the presence of afterglow from the decaying plasma in the interelectrode gap. It is shown that the most intense emission from metal atoms is observed near the electrode which acts as a cathode of the glow discharge during a given pulse half-period. The results of this work are of interest to researchers engaged in aerosol flux generation, synthesis of nanostructured materials, and the application of gas discharge for optical emission generation.
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