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Specific Features of the Distribution of Atomic-Level Occupancies in Highly Ionized Helium Arc Plasma

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Abstract

The near-threshold spectral region of radiation of helium arc plasma under atmospheric pressure and at an electron temperature of 3 eV was investigated. Under these conditions, plasma is ionizationally nonequilibrial due to the overwhelming predominance of recombination on a wall over the bulk recombination. It is shown that the occupancies of atomic levels n ≥ 4 rapidly decrease; therefore, no spectral lines from levels n ≥ 7 are observed. This fact is related to the destruction of excited atomic states in the quasi-static (ion) plasma microfield (mainly, in the nearest-ion field).

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Authors and Affiliations

  1. Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412, Russia

    L. G. D’yachkov, D. I. Kavyrshin, O. V. Korshunov & V. F. Chinnov

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  1. L. G. D’yachkov
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  2. D. I. Kavyrshin
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  3. O. V. Korshunov
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  4. V. F. Chinnov
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Correspondence to L. G. D’yachkov.

Additional information

Original Russian Text © L.G. D’yachkov, D.I. Kavyrshin, O.V. Korshunov, V.F. Chinnov, 2018, published in Teplofizika Vysokikh Temperatur, 2018, Vol. 56, No. 4, pp. 625–628.

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D’yachkov, L.G., Kavyrshin, D.I., Korshunov, O.V. et al. Specific Features of the Distribution of Atomic-Level Occupancies in Highly Ionized Helium Arc Plasma. High Temp 56, 605–608 (2018). https://doi.org/10.1134/S0018151X18040065

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  • DOI: https://doi.org/10.1134/S0018151X18040065

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