Strong Enhancement of Electron–Ion Recombination Owing to Free–Bound and Bound–Bound Resonance Transitions

Лебедев, В. С.; Кислов, К. С.; Нариц, А. А.

doi:10.1134/s0021364018210087

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Dissociative recombination (DR) of molecular ions with electrons is one of the most important processes in lowtemperature plasma. The study of this process, begun in [1], is actively ongoing at the present time [2,3]. DR forms plasma parameters, on the one hand, as the fastest deionization mechanism (the DR cross section for many ions exceeds 10 −13 cm 2 for thermal particles), and on the other hand, as an intense source of population of excited atomic states…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Rydberg-state formation following the ternary recombination via a non-resonant mechanism [76] of the energy transfer from a free electron to the nuclei in He+H + +e system was considered in [77]. Recently we published some preliminary results [78], which indicate that the resonant non-adiabatic processes may greatly enhance the recombination coefficient. The majority of the DR studies in ionic beams and in low-temperature plasmas consider conditions corresponding to k B T=D 0 , D 0 being the dissociation energy of the molecular ion.…”

Section: Introductionmentioning

confidence: 99%

Rydberg states population via three-body and dissociative recombination in low-temperature plasmas of rare gas mixtures

Лебедев

Кислов

Нариц

2019

Plasma Sources Sci. Technol.

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We study various physical mechanisms of electron-ion recombination accompanied by the formation of Rydberg atoms in plasmas containing atomic and molecular ions. Analytical approach to the description of resonant mechanism of ternary electron capture associated with the non-adiabatic energy transfer from free electron to the electronic shell of a quasimolecular ion is developed. Similar technique is used for the evaluation of the integral contribution of all rovibrational states of a bound molecular ion to the Boltzmann-averaged cross section and rate constant of dissociative recombination (DR). Simple expressions for cross sections and rate constants of non-resonant electron capture to Rydberg states in ternary electron-ion-atom collisions are derived in the impulse approximation. We perform a comparative analysis of the efficiencies of resonant and non-resonant three-body recombination of electrons with atomic ions and DR of molecular ions in plasmas of rare gas mixtures, Rg/Xe, with small relative concentration of xenon ([Xe]=[Rg], Rg=He, Ne, Ar, Kr). It is shown that in a wide range of plasma parameters the resonant recombination mechanisms are predominant. The behavior and magnitudes of the recombination rate constants turn out to be quite different for heteronuclear ions with small (HeXe + and NeXe + , D 0 =13.1 and 33 meV) and moderate (ArXe + and KrXe + , D 0 = 171 and 400 meV) values of the dissociation energy.

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Analysis of Efficiencies of Electron Capture by Ions into Rydberg States and Inelastic n → n' Transitions in Plasma of Inert Gas Mixtures

2020

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Strong Enhancement of Electron–Ion Recombination Owing to Free–Bound and Bound–Bound Resonance Transitions

Cited by 5 publications

References 16 publications

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

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

Rydberg states population via three-body and dissociative recombination in low-temperature plasmas of rare gas mixtures

Analysis of Efficiencies of Electron Capture by Ions into Rydberg States and Inelastic n → n' Transitions in Plasma of Inert Gas Mixtures

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