Destruction par chocs électroniques des atomes métastables et pseudo-métastables de néon dans une colonne positive

Leveau, Jean-Yves; Valignat, S.; Deigat, F.

doi:10.1051/jphyslet:019770038019038500

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…The cross sections for other states were presented, e.g. in [2,17,18] 5 , but the reported values differ considerably for some transitions from the recent data published in [16]. According to [19], the cross sections scale with the oscillator strengths also at low electron energies, where the Born approximation of excitation cross section is not valid.…”

Section: Considered Elementary Processesmentioning

confidence: 99%

Collisional–radiative model of neon discharge: determination ofE/Nin the positive column of low pressure discharge

Navrátil

Trunec

Hrachová

et al. 2007

J. Phys. D: Appl. Phys.

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A method for the determination of the reduced electric field strength (E/N) in a neon discharge from the optical emission spectra was developed. This method is based on a collisional–radiative model, which was used to calculate the emission spectra of the neon plasma. In the model, populations of 30 excited levels of the neon atom were studied. Various elementary collision processes were taken into account: electron impact excitation, de-excitation and ionization of neon atoms, emission and absorption of radiation, metastable–metastable collisions, metastable and radiative dimer production, Penning ionization, etc. To determine the rates of electron collisions, the Boltzmann kinetic equation for the electron distribution function (EDF) was solved for given E/N, and thus the dependence of the emission spectra on E/N could be determined. The EDF was expanded in terms of Legendre polynomials and the first two terms of this approximation were taken into account. The theoretical emission spectra were fitted by the non-linear least-squares method to the measured spectra with respect to the unknown parameter E/N.The method was applied to the study of low pressure dc glow discharge in neon. In such a discharge the calculated reduced electric field strength could be compared with the independent results of simultaneously performed electric probe measurements of E/N. Generally, close agreement of the calculated values with the experimental data was achieved.

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Section: Considered Elementary Processesmentioning

confidence: 99%

Collisional–radiative model of neon discharge: determination ofE/Nin the positive column of low pressure discharge

Navrátil

Trunec

Hrachová

et al. 2007

J. Phys. D: Appl. Phys.

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“…Row (c) shows values calculated using the average cross sections which Leveau et al [45] obtained using the formula of Drawin [27]. For these calculations we used an average electron speed of 8.8 × 10 7 cm s −1 corresponding to a temperature of 3.0 eV measured with a single Langmuir probe [46] for the electrons in the bulk of the energy distribution.…”

Section: Electron Collisional 1s-2p Rate Coefficientsmentioning

confidence: 99%

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

Borthwick¹,

Paterson²,

Smith

et al. 2000

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

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We describe a method for the determination of rate coefficients for collisional excitation out of the 1s states of a noble gas using continuous-wave laser collisionally induced fluorescence (CW LCIF, i.e. fluorescence from an upper level which is not that of the laser transition). The intensity of CW LCIF lines from an upper 2p level that is strongly coupled to an influential 1s level is dominated by the electron collisional rate out of that level. By an appropriate choice of LCIF line we fit our recently published theory to experimental observations to determine a set of electron collisional direct 1s mixing and 1s-2p excitation rate coefficients. The values of coefficients determined in this way show very good agreement with those which have been calculated using cross section data from the literature with the measured electron temperature. For cases where accurate cross section data are available for the 1s-2p transitions CW LCIF diagnostics should, via these rate coefficients, provide reliable values of the bulk electron temperature.

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“…In this work a cross-section for 1s 5 -2p 9 transition from [44] was scaled with oscillator strength to obtain a consistent cross-section set for all optically allowed excitations out of 3s states [29]. The uncertainty of the collision cross-sections is about ±30% as determined in [44], but the results of various authors differ by as much as a factor of 3 (compare [44][45][46]). Moreover, reliable calculation of self-absorption of resonant lines and also of lines originating from transitions between 3p and 3s states is needed.…”

Section: Influence Of Metastablesmentioning

confidence: 99%

Determination of electron density and temperature in a capacitively coupled RF discharge in neon by OES complemented with a CR model

Navrátil¹,

Dvořák²,

Brzobohatý³

et al. 2010

J. Phys. D: Appl. Phys.

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Destruction par chocs électroniques des atomes métastables et pseudo-métastables de néon dans une colonne positive

Abstract: 2014 La réponse en fréquence de la population des niveaux 1s3, 1s4 et 1s5 du néon, dans une colonne positive, à une variation sinusoïdale du courant de décharge a été étudiée. On en déduit les coefficients globaux de désexcitation par chocs électroniques :

Cited by 5 publications

References 5 publications

Collisional–radiative model of neon discharge: determination ofE/Nin the positive column of low pressure discharge

Collisional–radiative model of neon discharge: determination ofE/Nin the positive column of low pressure discharge

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

Determination of electron density and temperature in a capacitively coupled RF discharge in neon by OES complemented with a CR model

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