Dissociative Recombination of $${\text{Ne}}_{{\text{2}}}^{ + }$$ Molecular Ions with Electrons: Population of Ne(2р 54р) Atoms in a Decaying Plasma

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Decaying neon plasma has been investigated by kinetic spectroscopy. The experimental conditions were neon pressure of 0.2–152 Torr and electron density in the initial stage of decay [e] ≤ 5 × 1010 cm–3. The plasma was created by a pulsed barrier discharge with electrodes on the outer surface of a cylindrical glass tube. The discharge frequency was 40–160 Hz. It has been shown based on a comparative analysis of the dependences of the intensities of spectral lines on the time and electron temperature in the afterglow that the 2р54р levels are clearly divided into two groups in terms of population mechanisms. The lower levels (from 3р10 to 3р3 (Paschen notations)) are related to dissociative recombination of Ne+ 2 molecular ions with electrons, and the lines emitted by them behaved identically to the lines of the transitions 2p53s ← 2p53p and 2p53p ← 2p53d up to pressures of 0.6 Torr. The kinetics of the upper levels (3р5, 3р2, 3р4, and 3р1) had a more complicated character, and, at low pressures, the populations of all 2p54p levels were related to a collisional-radiative recombination of Ne+ ions. Significant differences in the dependences of the relative populations of 3d- and 4p levels on neon pressure are discussed.

Original languageEnglish
Pages (from-to)418-427
Issue number3
StatePublished - 1 Sep 2019

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


  • decaying plasma
  • dissociative recombination
  • elementary processes
  • molecular ions
  • rate constant


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