Electron-impact-induced excitation transfer between 3s levels of the neon atom

Иванов, В. А.

doi:10.1088/0953-4075/31/8/025

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…In calculations, the profiles of emission and absorption lines were assumed to be Doppler ones with the complex structure of the 388.9 nm line taken into account. The method of absorption measurement of densities of metastable atoms was similar to the one detailed in [13].…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

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

Иванов

2022

Optics and Spectroscopy

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“…Единственный параметр, который приходилось подбирать из условия наилучшего согласия с экспериментом, -вероятность выхода резонансного излучения на переходе в основное состояние 3 P 1 → 1 S 0 + hν. Подобный прием был применен нами в работе [38], результаты которой по измерению константы скорости k e (T e ) электронно-стимулированных переходов 3 P 2 + e ke −→ 3 P 1 + e мы использовали в данной работе для оценки плотности электронов в послесвечении с импульсным подогревом электронов.…”

Section: плотности атомов конфигурации 2p 5 3sunclassified

Спектроскопия барьерного разряда низкого давления. Послесвечение с ионами Ne-=SUP=-2+-=/SUP=-, Ne-=SUP=-+-=/SUP=- и Ne-=SUP=-2+-=/SUP=-

Иванов¹

2021

Оптика И Спектроскопия

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We present the results of modeling the radiation of a decaying plasma, formed by the processes of electron-ion recombination with the participation of three neon ions: the molecular ion Ne2+ and atomic ions Ne+ and Ne2+. Such a combination of ions, simultaneously participating in the formation of the plasma spectrum, was first discovered in the afterglow of a pulsed barrier discharge of a cylindrical geometry at neon pressures less than 1 Torr and an electron density[e] ≤ 4 × 1010 cm-3. The main attention is paid to the comparative analysis of the mechanisms of impact-radiation recombination of Ne+ and Ne2+ ions based on the numerical solution of the system of differential equations for the densities of ions and long-lived excited atoms in the afterglow, taking into account the main elementary processes in decaying plasma with pulsed "heating" of electrons. The regularities of electron temperature relaxation from discharge values of several electron volts to 300 K in the late afterglow are considered in particular details. Comparison of the model solutions with the spectral intensities measured by the multichannel photon counting method shows that, given their good agreement in the case of singly charged ions, an adequate description of the evolution of ionic lines requires expanding the available information on the recombination of Ne2+ ions.

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“…This coefficient is calculated using the current EVDF. The coefficients k mix a and k q describe the mixing of the metastable and resonant levels by atomelectrons collisions 42,43 and the pressure quenching, 44 N a (0) and N a (1) denote initial and new values of the metastable atom number densities. The metastable generation rates S s5 and S s3 are calculated for the current EVDF using the apparent cross-sections 30 of the excitation collisions.…”

Section: B Self-consistent Modeling Of the Axially Uniform Positive mentioning

confidence: 99%

Two-dimensional positive column structure in a discharge tube with radius discontinuity

et al. 2014

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The low-pressure (40 and 90 Pa) low-current (4 and 10 mA) direct current discharge in a tube with a sharp change of its radius is studied both numerically and experimentally. A fully self-consistent hybrid numerical model of a two-dimensional non-uniform positive column in neon is developed using a nonlocal approach. The model combines kinetic simulation of the electrons (under two-terms approach) and fluid description of the neon ions and permits to calculate the distribution of all plasma parameters in the direct current discharges in the cameras with cylindrical geometry and radius discontinuity. The simulation results are compared with the measured 585.3 nm neon spectral line absolute intensities and excited 1s 3 metastable neon atom number densities. Non-local electron kinetics in the transition region and formation of standing strata are discussed. V C 2014 AIP Publishing LLC. [http://dx.

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Electron-impact-induced excitation transfer between 3s levels of the neon atom

Cited by 24 publications

References 10 publications

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

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

Спектроскопия барьерного разряда низкого давления. Послесвечение с ионами Ne-=SUP=-2+-=/SUP=-, Ne-=SUP=-+-=/SUP=- и Ne-=SUP=-2+-=/SUP=-

Two-dimensional positive column structure in a discharge tube with radius discontinuity

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