Dissociation Energy and Dissociative Recombination of $${\text{Ne}}_{2}^{ + }$$ and HeNe+ Ions

Иванов, В. А.; Petrovskaya, A. S.; Skoblo, Yu. É.

doi:10.1134/s1063776119030051

Cited by 11 publications

(6 citation statements)

References 52 publications

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“…to populate efficiently all states of a neon atom with energies lower than the one of the ground vibrational level v = 0 of a HeNe + ion [8,9,23].…”

Section: Levels 2p 5 5smentioning

confidence: 99%

“…Since energy E(v = 0) ∼ 21 eV [23,24], the entire set of excited states of a Ne atom considered in this study (from 2p 5 6s (or from 2p 5 4p for a Ne + 2 ion [25]) and further down the excitation energy scale) emerges directly in reactions (4) or due to cascade transitions in plasma. At the same time, levels 2p 5 6s are already unavailable for excitation transfer process (1).…”

Section: Levels 2p 5 5smentioning

confidence: 99%

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Low pressure DBD in He-Ne mixture. Spectroscopy of the Afterglow

Иванов

2022

Optics and Spectroscopy

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The paper considers the possibility of using a low-pressure dielectric barrier discharge (DBD) as a plasma source for the active medium of a He-Ne-laser. The results of a spectroscopic study of the decay stage of a DBD plasma of a cylindrical configuration with a pronounced inverse population of the upper level of the 2p55s configuration, which makes the line of 632.8 nm one of the brightest in the visible region of the spectrum, are presented. Based on the analysis of data on the populations of the excited levels of the neon atom and the metastable levels of helium 21S0 and 23S1, it is shown that in the early stage of the DBD afterglow at helium pressures of a fraction of a Torr, the distribution of populations over the 2p55s and 2p54d levels of the neon atom, which is characteristic of the excitation transfer mechanism, is realized. In the late afterglow with the departure of helium atoms He21S0, emission in the visible region of the spectrum is formed mainly by transitions from levels of the 2p53p, configuration, the population of which is associated with He(23S1) atoms. At this stage, the population of the 2p55s and 2p54d states by electron-ion recombination processes is ineffective and does not lead to the formation of population inversion. As an optimal solution in terms of the 632.8 nm line brightness in the afterglow, it is proposed to use a discharge with electrodes along the outer surface of a cylindrical discharge tube, initiated at frequencies that exclude the recombination stage of the afterglow. Keywords: elementary processes, barrier discharge, inverse population, afterglow, helium-neon plasma, excitation transfer

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“…to populate efficiently all states of a neon atom with energies lower than the one of the ground vibrational level v = 0 of a HeNe + ion [8,9,23].…”

Section: Levels 2p 5 5smentioning

confidence: 99%

Section: Levels 2p 5 5smentioning

confidence: 99%

Low pressure DBD in He-Ne mixture. Spectroscopy of the Afterglow

Иванов

2022

Optics and Spectroscopy

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“…here E vJ = E vJ − D 0 is the rovibrational energy referred to its dissociation limit, E v=0,J=0 = −D 0 . With the help of the Bohr-Sommerfeld relation, dv can be expressed as dv = T vJ /(2π ) dE vJ , so (18) becomes…”

Section: Statistical-averaged Cross Section Of Dissociative Excitationmentioning

confidence: 99%

“…Molecular cations play important role in physics of stellar and planetary atmospheres [1][2][3], chemical physics [4], physics of low-temperature plasmas [5], physics of high-power gas lasers [6] and VUV radiation sources [7]. Collisions of molecular ions with electrons are the topics of ongoing theoretical [8][9][10][11][12][13][14] and experimental studies [15][16][17][18][19]. Such collisions may result in a variety of competing physical processes, including ionization [16,20], excitation [9,11], dissociation [9,10,15] and fragmentation [20,21], and dissociative recombination (DR) [3,10,[22][23][24][25] of the molecular ions, and thus present a challenge to both theory [3,26,27] and experiments [3,22,28].…”

Section: Introductionmentioning

confidence: 99%

Semiclassical theory of resonant dissociative excitation of molecular ions by electron impact

Нариц¹,

Кислов²,

Лебедев³

2020

J. Phys. B: At. Mol. Opt. Phys.

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We have developed a semiclassical approach to the description of resonant dissociative excitation of a molecular ion induced by collisions with plasma free electrons and accompanied by the non-adiabatic transitions between its different electronic terms. It is based on the quasistatic treatment of nuclear particles relative motion in a molecular ion combined with the approximation of a quasicontinuum for rovibrational states. We have derived the semianalytic expressions for the Boltzmann-averaged cross sections, , and rate constants, α de(T, T e), of this process. The resulting expressions for and α de(T, T e) with explicit dependencies on the electron energy, ɛ, the gas, T, and electron, T e, temperatures are valid when the thermal energy k B T exceeds the value of the lowest vibrational quantum, ℏω e, of a molecular ion. The theory developed is applied to studying the resonant dissociative excitation of homo-nuclear , and ions as well as the hetero-nuclear rare gas ions RgXe+ (Rg = Ne, Ar, and Kr) with significantly different values of the dissociation energy. The efficiencies of the electron-impact dissociative excitation process and dissociative recombination leading to the population of the Rydberg states are compared. Our results of calculations are in good agreement with the available experimental data.

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“…The plasmas of rare gas mixtures are of great interest for many applications in plasma physics, optoelectronics, laser physics and material processing, including VUV radiation sources [1,2], control of electromagnetic wave propagation [3], alternating current plasma displays [4,5], microplasma arrays [6,7], plasma etching [8], development of optically pumped rare gas lasers [9,10] and high-power xenon lasers [11,12]. The kinetics of electronic transitions and excited level population in such plasmas are the topics of ongoing experimental [13][14][15][16][17] and theoretical [18][19][20][21] studies. Recombination is one of the key elementary processes in plasmas [22][23][24].…”

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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Dissociation Energy and Dissociative Recombination of $${\text{Ne}}_{2}^{ + }$$ and HeNe+ Ions

Cited by 11 publications

References 52 publications

Low pressure DBD in He-Ne mixture. Spectroscopy of the Afterglow

Low pressure DBD in He-Ne mixture. Spectroscopy of the Afterglow

Semiclassical theory of resonant dissociative excitation of molecular ions by electron impact

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

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