TY - JOUR

T1 - Dissociation Energy and Dissociative Recombination of Ne+2 and HeNe+ Ions

AU - Ivanov, V. A.

AU - Petrovskaya, A. S.

AU - Skoblo, Yu. E.

N1 - Ivanov, V.A., Petrovskaya, A.S. & Skoblo, Y.E. Dissociation Energy and Dissociative Recombination of Ne+2 and HeNe+ Ions. J. Exp. Theor. Phys. 128, 767–777 (2019). https://doi.org/10.1134/S1063776119030051

PY - 2019/5/1

Y1 - 2019/5/1

N2 - We present the results of our study of a weakly ionized decaying helium plasma with a small admixture of neon by means of kinetic spectroscopy. The experimental conditions are a helium pressure of 10–38 Torr, an electron density [e] ≤ 2 × 1011 cm–3, and a neon density [Ne] ≤ 2 × 10–4 [He]. The recombination processes of [Ne]≤ 2 × 10-4[He], HeNe+, and Ne+ ions with electrons have been identified by the decaying-plasma radiation. The neon afterglow spectrum at [e] ≤ 1011 cm–3 is shown to be formed mainly by dissociative recombination of Ne+2 and HeNe+ ions in the ground vibrational state v = 0. The early afterglow of a number of atomic neon lines is formed by the well-known process of excitation transfer from helium atoms in metastable states He(23S1, 21S0). At [e] > 1011 cm–3, the afterglow spectrum is enriched due to the collisional-radiation recombination of Ne+ ions. In the recombination stage of the afterglow at room electron temperature, the existence of a clear upper bound on the excitation energy of the atomic neon levels being populated is characteristic of the dissociative recombination of both molecular ions. For Ne+2 this is the 3p1 level (in Paschen notation) with an energy of 20.369 eV, with the levels closest to Ne+2(v=0) in energy being 3p3 and 3p2 with energies of 20.26 and 20.3 eV, respectively; for HeNe+, this is the 5d'1 level with an energy of about 21.02 eV. These values are proposed to be taken as the energies of Ne+2 and HeNe+ ions in the ground vibrational state.

AB - We present the results of our study of a weakly ionized decaying helium plasma with a small admixture of neon by means of kinetic spectroscopy. The experimental conditions are a helium pressure of 10–38 Torr, an electron density [e] ≤ 2 × 1011 cm–3, and a neon density [Ne] ≤ 2 × 10–4 [He]. The recombination processes of [Ne]≤ 2 × 10-4[He], HeNe+, and Ne+ ions with electrons have been identified by the decaying-plasma radiation. The neon afterglow spectrum at [e] ≤ 1011 cm–3 is shown to be formed mainly by dissociative recombination of Ne+2 and HeNe+ ions in the ground vibrational state v = 0. The early afterglow of a number of atomic neon lines is formed by the well-known process of excitation transfer from helium atoms in metastable states He(23S1, 21S0). At [e] > 1011 cm–3, the afterglow spectrum is enriched due to the collisional-radiation recombination of Ne+ ions. In the recombination stage of the afterglow at room electron temperature, the existence of a clear upper bound on the excitation energy of the atomic neon levels being populated is characteristic of the dissociative recombination of both molecular ions. For Ne+2 this is the 3p1 level (in Paschen notation) with an energy of 20.369 eV, with the levels closest to Ne+2(v=0) in energy being 3p3 and 3p2 with energies of 20.26 and 20.3 eV, respectively; for HeNe+, this is the 5d'1 level with an energy of about 21.02 eV. These values are proposed to be taken as the energies of Ne+2 and HeNe+ ions in the ground vibrational state.

UR - http://www.scopus.com/inward/record.url?scp=85067648086&partnerID=8YFLogxK

U2 - 10.1134/S1063776119030051

DO - 10.1134/S1063776119030051

M3 - Article

AN - SCOPUS:85067648086

VL - 128

SP - 767

EP - 777

JO - Journal of Experimental and Theoretical Physics

JF - Journal of Experimental and Theoretical Physics

SN - 1063-7761

IS - 5

ER -