Abstract
A spectral study of arc helium plasma of atmospheric pressure with the electron density n e ≤ 1017 cm−3 and the ionization degree of ∼0.25 is performed. The character of the population of HeI levels with the excitation energy of 20.96–24.04 eV, which indicates infeasibility of the Boltzmann law with the electron temperature T e for describing the relative population of excited HeI states, is experimentally determined. Due to the experimentally revealed unfitness of the local thermodynamic equilibrium (LTE) model for estimating T e , mixed contours of the HeI 1083 line were divided into the Lorentz and Gaussian components. As a result, both the Stark effect constant that is poorly studied for this line and the temperature of heavy particles T g in the plasma were estimated based on the Doppler component of its Gaussian half-width. As the arc current varied from 200 to 400 A, T g increased from 20000 to 25 500 K, while the increase in the ionization temperature was, in this case, negligible (from 20000 to 21000 K).
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Original Russian Text © E.Kh. Isakaev, V.F. Chinnov, M.A. Sargsyan, D.I. Kavyrshin, 2013, published in Teplofizika Vysokikh Temperatur, 2013, Vol. 51, No. 2, pp. 163–169.
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Isakaev, E.K., Chinnov, V.F., Sargsyan, M.A. et al. Nonequilibrium state of highly ionized helium plasma at atmospheric pressure. High Temp 51, 141–146 (2013). https://doi.org/10.1134/S0018151X13020090
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DOI: https://doi.org/10.1134/S0018151X13020090