Dissociative Recombination of $${\text{Ne}}_{{\text{2}}}^{ + }$$ Molecular Ions with Electrons: Population of Ne(2р54р) Atoms in a Decaying Plasma

Gordeev, S. V.; Иванов, В. А.; Skoblo, Yu. É.

doi:10.1134/s0030400x19090133

Cited by 7 publications

(22 citation statements)

References 30 publications

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“…This is confirmed by the results of experiments in a wide range of pressure changes [12,14,19], which clearly indicate the participation of collisions (7) in the formation of the afterglow spectrum at pressures above 1 Torr. It is obvious that correct data on α j values can be obtained at P Ne < 1 Torr only.…”

Section: Introductionsupporting

confidence: 58%

“…Spectroscopic observations [8][9][10][11][12][13][14] of the afterglow of a direct current (DC) or high-frequency (HF) current glow discharge in inert gases (except for helium [15]) have shown that DR populates the excited levels np 5 (n + 1)p, np 5 (n + 1)d and np 5 (n + 2)p (n is the principal quantum number of an unexcited electron).…”

Section: Introductionmentioning

confidence: 99%

“…The radiation at transitions from higher levels In the papers, where it was noticed [8][9][10]14], the authors associated with collisionradiative recombination (CRR) of Ne + ions:…”

Section: Introductionmentioning

confidence: 99%

“…The study of DR of molecular ions in a spectroscopic experiment at such low pressures is still limited by data [14,20]. In the paper [14] relative populations of 4p-levels of the neon atom were measured in the pressure range 150−0.2 Torr, and it was shown that up to P Ne ≈ 0.6 Torr at the electrons density [e] ≤ 5 • 10 10 cm −3 it is possible, based on the difference between the time characteristics of the spectral line intensities J(t), and their reactions to pulsed " heating" of electrons in the afterglow, to reliably separate the DR and CRR fluxes and to find the relative values of the coefficients α j . Under these conditions, the conversion of atomic ions (6) inefficient [20], so their density is low…”

Section: Introductionmentioning

confidence: 99%

“…The DR selectivity is especially pronounced when the levels of the 2p 5 4p configuration are populated. According to the results [14], at electron temperatures close to room temperature DR is available for only those levels of the neon atom that are located on the energy scale below 4p 4 1 (3p 3 in Paschen notations), i. e. 4p 5 −4p 10 . To complete the picture of the neon afterglow, note that, as we know, currently there are no data on DR role in the population of the levels of 2p 5 4s configuration.…”

Section: Introductionmentioning

confidence: 99%

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Dissociative Recombination in the Afterglow of Low-pressure Barrier Discharge. Population of Ne(2p-=SUP=-5-=/SUP=-3d) Atoms

Иванов

2022

Optics and Spectroscopy

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The decaying neon plasma produced by the dielectric barrier discharge (DBD) in a cylindrical tube at a pressure of 0.1-40 Torr has been spectroscopically investigated to analyze the dissociative recombination (DR) of molecular ions with electrons as a mechanism for the formation of excited atoms. It is shown that, at the electron density in the afterglow less than 5·1010 cm-3 the DR is the dominant source of population of 3d levels at pressures PNe≥ 0.6 Torr. At lower pressures, the optical properties of the decaying plasma are formed to a greater extent by the collisional-radiative recombination of Ne+ ions. A significant variation of the relative intensities of the 3d->3p transition lines in the afterglow with a change in gas pressure was found, reflecting the effect of inelastic collisions on the formation of the spectrum of decaying plasma in the near infrared region. From measurements carried out at a pressure of 0.6 Torr, the relative values of the partial DR coefficients for the 3dj levels of the neon atom were found. Comparison of these data with measurements in the near ultraviolet region, containing the lines of 4p->3s transitions, indicates the need to take into account the cascade 4p->3d transitions to correctly solve the problem of the final products of dissociative recombination. Keywords: dielectric-barrier discharge, low-pressure plasma, optical emission spectroscopy, dissociative recombination, molecular ions, collisional-radiative recombination, cascade transitions.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

“…The radiation at transitions from higher levels In the papers, where it was noticed [8][9][10]14], the authors associated with collisionradiative recombination (CRR) of Ne + ions:…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissociative Recombination in the Afterglow of Low-pressure Barrier Discharge. Population of Ne(2p-=SUP=-5-=/SUP=-3d) Atoms

Иванов

2022

Optics and Spectroscopy

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Superposition of low-pressure DBD and RF induction discharge for spectroscopic study of dissociative recombination in decaying plasma

Иванов¹

2020

Plasma Sources Sci. Technol.

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The aim of the work was to find the optimal way to set up an experiment for spectroscopic study of the dissociative recombination of molecular ions with electrons in low electron density plasma at low gas pressure. In such an experiment, the influence of inelastic atom-atom collisions on the distribution of the DR flux over the excited atomic levels can be excluded. The first results of an experiment on combining a low-frequency barrier discharge (DBD) in neon at a pressure of less than 1 Torr with a pulsed radio-frequency (RF) induction discharge are presented. To create the plasma, we used DBD in a cylindrical glass tube with an inner diameter of 3.9 cm, which forms the spatial distribution of electron density with a minimum on the axis of the tube. The evolution of such a spatial distribution due to ambipolar diffusion in the initial stage of plasma decay provides an influx of charged particles to the center of the discharge tube, which increases the afterglow duration and helps to overcome the difficulties of detecting weak plasma radiation. The specific features of the DBD also appeared in the ionic composition of the plasma, which contained, in addition to Ne + and Ne 2 + , the Ne ++ ions, whose recombination with electrons significantly enriched the afterglow spectrum in the short-wavelength region. An RF discharge was used for pulsed heating of electrons in the afterglow. It is shown that, in accordance with the ionic composition, the radiation of a decaying plasma is presented by three groups of spectral lines with characteristic time behavior and the electron temperature dependence. The advantages of the proposed approach for studying the mechanism of dissociative recombination are discussed.

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Low-Pressure Barrier Discharge as a Source of Radiation for Spectroscopic Study of Collisional-Radiative Recombination of Doubly Charged Ions

Иванов

2023

2023 IEEE Sustainable Smart Lighting World Conference &Amp; Expo (LS18)

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Dissociative Recombination of $${\text{Ne}}_{{\text{2}}}^{ + }$$ Molecular Ions with Electrons: Population of Ne(2р54р) Atoms in a Decaying Plasma

Cited by 7 publications

References 30 publications

Dissociative Recombination in the Afterglow of Low-pressure Barrier Discharge. Population of Ne(2p-=SUP=-5-=/SUP=-3d) Atoms

Dissociative Recombination in the Afterglow of Low-pressure Barrier Discharge. Population of Ne(2p-=SUP=-5-=/SUP=-3d) Atoms

Superposition of low-pressure DBD and RF induction discharge for spectroscopic study of dissociative recombination in decaying plasma

Low-Pressure Barrier Discharge as a Source of Radiation for Spectroscopic Study of Collisional-Radiative Recombination of Doubly Charged Ions

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