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Wiedemann-Franz ratio in plasmas in the mixtures of xenon, argon and cesium

Novaković Nadežda V. (Faculty of Sciences and Mathematics, Niš, Serbia)
Stojilković S.M. (Faculty of Electronics, University of Niš, Serbia)
Gajić Dragan Ž. (Faculty of Sciences and Mathematics, Niš, Serbia)

In the present paper, the xenon plasmas containing argon and cesium as additive and pertaining to the above mentioned type (high-pressure low-temperature, LIE) are studied, and a theoretical evaluation of their basic transport parameters is presented. The numerical calculations were based on the assumption that the system is kept under constant pressure and temperature and that it attained local thermo dynamical equilibrium. Some results of a theoretical study which embraced numerical evaluations of the plasma composition, electron collision frequency, electrical and thermal conductivities and Wiedemann-Franz ratio, all regarded as functions of pressure and temperature, are given for high-pressure (from 0,1 MPa to 1,5 MPa) and low-temperature (from 2 000 K to 20 000 K). A previously derived modified expression for the Debye radius, offering the possibility to treat the plasmas considered as weakly non-ideal in the whole temperature range of interest, is used in the evaluations, in combination with the Saha equations for the relevant ionization stages of xenon, argon and cesium. .

Keywords: xenon plasma, argon, cesium, local thermo dynamical equilibrium, number density, collision frequency, electrical conductivity, thermal conductivity, Wiedemann-Franz ratio