On the Selectivity of Population of the Neon Excited Levels in the Decaying He–Ne Plasma

Иванов, В. А.; Skoblo, Yu. É.

doi:10.1134/s0030400x19110110

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…On the one hand, this deionization mechanism determines the properties of a wide range of laboratory plasma objects and is a necessary link in models of stellar and planetary atmospheres [2]. On the other hand, despite the long history of studying the process, previously unknown manifestations of DR are found even in the case of the simplest molecular ions, such as H + 2 [3] or HeNe + [4], which stimulates the development of new approaches to the calculation of its main characteristics i.e. cross-sections and rate constants [5].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…For example, it was demonstrated in [8,9] that the afterglow of a discharge in a He−Ne mixture is formed under certain conditions as a result of recombination of heteronuclear HeNe + ions ans electrons. The effect of concentration of emission of the 2p 5 4p shell of a neon atom, which is represented by a set of 30 spectral lines of comparable intensity in pure neon plasma, into a single line at 352.0 nm emitted from the upper 3p 1 level (in the Paschen notation) at higher helium pressures was described in [10]. This phenomenon was discovered in studies of the evolution of the afterglow spectrum of a barrier discharge with a low neon content (several mTorr) under a total pressure of 0.1−20 Torr of the mixture.…”

Section: Introductionmentioning

confidence: 99%

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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“…С одной стороны, этот механизм деионизации определяет свойства широкого круга лабораторных плазменных объектов и является необходимым звеном в моделях звездной и планетной атмосфер [2]. С другой стороны, несмотря на долгую историю изучения процесса, обнаруживаются ранее неизвестные проявления DR даже в случае простейших молекулярных ионов, таких как H + 2 [3] или HeNe + [4], что стимулирует развитие новых подходов к расчету его основных характеристик-сечений и констант скорости [5]. Наиболее подробно обсуждаемый процесс изучен в плазме инертных газов, а наибольшее количество работ посвящено рекомбинации ионов Ne + 2 .…”

Section: Introductionunclassified

Диссоциативная рекомбинация в послесвечении барьерного разряда в неоне низкого давления. Заселение атомов конфигурации 2p-=SUP=-5-=/SUP=-3d

Иванов¹

2021

Оптика И Спектроскопия

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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.

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On the Selectivity of Population of the Neon Excited Levels in the Decaying He–Ne Plasma

Cited by 6 publications

References 4 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

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

Диссоциативная рекомбинация в послесвечении барьерного разряда в неоне низкого давления. Заселение атомов конфигурации 2p-=SUP=-5-=/SUP=-3d

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