ИСТИНА

For the most of the surface plasma treatment technologies, the diffuse mode of the barrier discharges seems to be more desirable than the filamentary one. That is why the knowledge of the discharge operation parameters to control the transition between these modes is of great importance. Recently we reported the results of the plasma diagnostics of the barrier discharges in argon with admixtures of acetone. These discharges were found to be diffuse only in the gaps wider than 4 mm and for a limited range of acetone concentration, the latter corresponding to the local minimum of the burning voltage. In the present paper, we propose a semi-empirical physical model for the barrier discharges in inert gases with small admixtures of molecular gases, that accounts for the experimental findings mentioned above, and that provides a simple method to prognosticate the possibility of the diffuse mode appearance for any chosen combination “noble gas + molecular gas (admixture)”.