Diagnostics of Helium-Argon Arc Discharge Plasma Based on Spectral Line Shape Measurements

Abstract

Electron densities and ion (gas) temperatures on the axis of an arc discharge plasma, produced at atmospheric pressure in a gas mixture of 95% helium and 5% argon, are determined at two arc currents. The evaluation of both main plasma parameters is based on line shape measurements, the ion temperature on the Doppler broadening of selected ArII lines, while the electron density on the Stark broadening of the hydrogen Hp line which appear in the spectrum due to hydrogen traces in the applied gases. The significance of reliable plasma diagnostics for determination of atomic structure data is discussed.PACS numbers: 32.30.-r, 32.70.-n, 52.25.-b

Spectroscopic determination of the electrical parameters of a micro-wave discharge in helium plasma

“…The spectroscopy optical emission is a technique frequently used in the electrical discharge plasmas characterization (Wujec and Musielok 1999;Grycuk et al, 2002]. The study of the emitted light by discharge, allow us to collect a lot of information on the discharge parameters, such as the electronic density and the electronic temperature.…”

Experimental Studies of Longitudinal Demixing of Plasma Components in a Wall-stabilized Arc

“…In such discharges operated at steady state conditions, plasmas close to Local Thermodynamic Equilibrium (LTE) or at least partial LTE may be easily produced, facilitating the interpretation of the detected spectra [1]. spectral line strength determination [4], [5], line shape investigation [6], [7] or in studies of other plasma properties [8], [9]). spectral line strength determination [4], [5], line shape investigation [6], [7] or in studies of other plasma properties [8], [9]).…”

“…Among various plasma sources of this kind, the wall-stabilized arc [2], [3] has been extensively applied in emission studies of atomic structure of many elements (e.g. spectral line strength determination [4], [5], line shape investigation [6], [7] or in studies of other plasma properties [8], [9]).…”