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Hydrogen dissociation degree in the Grimm-type glow discharge measured by optical emission spectroscopy

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Abstract

The hydrogen dissociation degree is measured by means of optical emission spectroscopy in the cathode sheath of cylindrical abnormal Grimm-type DC glow discharge operating in the hydrogen–argon mixture at low pressure. The degree of dissociation, ranging from 80% in the close vicinity of the cathode and decreasing to 60% towards the negative glow, is obtained from the intensity ratio of the hydrogen Balmer Hγ line and the diagonal Fulcher-α molecular bands. The cathode sheath thickness is extracted from the electric field strength distribution measured using Stark spectroscopy of the hydrogen Balmer Hα line. An electron temperature of 2.7 eV in the negative glow region is estimated by observing the intensity ratio of the diagonal Fulcher-α bands and the Hα line.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors' comment: The datasets supporting the conclusions of this article are available from the corresponding author upon reasonable request.]

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Acknowledgements

This work is supported by the Ministry of Science, Technological Development and Innovations of the Republic of Serbia (Grant No. 451-03-47/2023-01/200162). Part of the results was presented at the 31st Summer School and International Symposium on the Physics of Ionized Gasses (SPIG), September 5–9, 2022, Belgrade, Serbia. Conference proceedings: https://publications.aob.rs/102/pdf/spig2022-23-8.pdf.

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Authors and Affiliations

  1. Faculty of Physics, University of Belgrade, P.O. Box 44, 11001, Belgrade, Serbia

    Milica M. Vasiljević, Ivan R. Videnović & Djordje Spasojević

  2. University of Defence, Military Academy, Pavla Jurišića Šturma 33, 11105, Belgrade, Serbia

    Gordana Lj. Majstorović

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  1. Milica M. Vasiljević
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  2. Gordana Lj. Majstorović
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  3. Ivan R. Videnović
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Contributions

MMV contributed to conceptualization, methodology, investigation, and writing. GLM contributed to conceptualization, methodology, investigation, and writing. IRV contributed to conceptualization, methodology, and writing—review. DS contributed to conceptualization, methodology, and supervision.

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Correspondence to Milica M. Vasiljević.

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Vasiljević, M.M., Majstorović, G.L., Videnović, I.R. et al. Hydrogen dissociation degree in the Grimm-type glow discharge measured by optical emission spectroscopy. Eur. Phys. J. D 77, 130 (2023). https://doi.org/10.1140/epjd/s10053-023-00704-7

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