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Effect of vibrational kinetics of He2 + ions on the afterglow of a discharge in helium

  • Optics and Spectroscopy
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Abstract

A decaying weakly ionized helium plasma [ne=(0.2–1.1)·1011 cm−3, p=(40–70) mm Hg] was studied experimentally. It is shown that the experimental time dependences of the intensities of atomic lines and molecular bands in the afterglow phase can be explained if the vibrational kinetics of He2 + ions is included in the analysis. Analysis of the measurements shows that for ne ≲ 1011 cm−3 and Na ≳ 1018 cm−3 deexcitation of He2 + ions occurs primarily as a result of inelastic collisions with helium atoms. Based on the experimental data, an approximate value was obtained for the rate constants of the vibrational relaxation of molecular helium ions ≈10−16 cm3/sec. These results are used for making a qualitative analysis of the distribution of He2 + ions over the vibrational states in the discharge phase.

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Authors and Affiliations

  1. A. A. Zhdanov Leningrad State University, USSR

    V. A. Ivanov & Yu. É. Skoblo

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  1. V. A. Ivanov
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  2. Yu. É. Skoblo
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 88–96, November, 1986.

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Ivanov, V.A., Skoblo, Y.É. Effect of vibrational kinetics of He2 + ions on the afterglow of a discharge in helium. Soviet Physics Journal 29, 942–948 (1986). https://doi.org/10.1007/BF00898452

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  • DOI: https://doi.org/10.1007/BF00898452

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