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S. Haslinger, J. Laimer, H. Störi:
"Stability conditions of argon and helium gas mixtures in an atmospheric pressure plasma jet";
Vortrag: 56. Jahrestagung der Österr. Physikalischen Gesellschaft (ÖPG), TU Graz; 19.09.2006.

Atmospheric pressure glow discharges (APGD) are used increasingly for many industrial applications, targeting diagnostics and technical applications like surface modification, etching, deposition, sterilization and decontamination. The properties of the APGD make this plasma an attractive alternative to vacuum plasmas and therefore investigations on stability conditions seems to be required.
Stability conditions for the alpha-discharge mode of a radio frequency - capacitive coupled - atmospheric pressure plasma jet operated with helium-argon gas mixtures and additives are investigated and influences on plasma parameters are reported. Description of plasma parameters by measuring macroscopic terms of the discharge would be of advantage regarding to physical understanding of the discharge modes and for industrial applications. Therefore an analyzing algorithm is investigated and compared with formally known algorithms. Deviations and achievable accuracies of the various plasma models describing bulk electron densities and electrode space charge sheaths are discussed in respect to measurements. Hence it is shown, that plasma properties can be described by measuring macroscopic electrical properties of the APGD using advanced analyzing algorithms