Power loss by resonance radiation from a dc neon glow discharge at low pressures and low currents

Franke, Steffen; Deutsch, Hans‐Peter; Dinklage, A.; Solyman, S.; Wilke, Charles R.

doi:10.1088/0022-3727/34/3/316

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…The setup presented in figure 23 was used for precise measurements of the radial distribution of xenon atoms in the lowest excited states in the low-pressure discharge by laser atom absorption spectroscopy (LAAS) [57]. Similar measurements were carried out in the neon discharge [58] The results of the measurements for the density of excited atoms are presented in figure 24 (top-xenon, bottom-neon). The profiles of the resonance atoms are significantly narrower in comparison with those of the metastable atoms.…”

Section: Measurements Of the Radial Density Distributions Of The Reso...mentioning

confidence: 99%

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Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Golubovskiǐ

Gorchakov

Uhrlandt

2013

Plasma Sources Sci. Technol.

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Atoms in electronically excited states are of significant importance in a large number of different gas discharges. The spatio-temporal distribution particularly of the lower excited states, the metastable and resonance ones, influences the overall behavior of the plasma because of their role in the ionization and energy budget. This article is a review of the theoretical and experimental studies on the spatial formation and temporal evolution of metastable and resonance atoms in weakly ionized low-temperature plasmas. Therefore, the transport mechanisms due to collisional diffusion and resonance radiation are compared step by step. The differences in formation of spatio-temporal structures of metastable and resonance atoms in plasmas are attributed to these different transport mechanisms. The analysis is performed by obtaining solutions of the diffusion and radiation transport equations. Solutions of stationary and non-stationary problems by decomposition over the eigenfunctions of the corresponding operators showed that there is, on the one hand, an effective suppression of the highest diffusion modes and, on the other hand, a survival of the highest radiation modes. The role of the highest modes is illustrated by examples. In addition, the differences in the Green functions for the diffusion and radiation transport operators are discussed. Numerical methods for the simultaneous solution of the balance equations for metastable and resonance atoms are proposed. The radiation transport calculations consider large absorption coefficients according to the Lorentz contour of a spectral line. Measurements of the distributions of metastable and resonance atoms are reviewed for a larger number of discharge conditions, i.e. in the positive column plasma, afterglow plasma, constricted pulsed discharge, stratified discharge, magnetron discharge, and in a discharge with a cathode spot.

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Section: Measurements Of the Radial Density Distributions Of The Reso...mentioning

confidence: 99%

“…) Top: radial distributions of the resonance 1 P 1 (left) and metastable 3 P 0 (right) states of xenon atoms [57]. Bottom: radial distributions of the resonance 1 P 1 (left) and metastable 3 P 0 (right) states of neon atoms [58].…”

Section: Metastable and Resonance Atoms In The Afterglowmentioning

confidence: 99%

Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Golubovskiǐ

Gorchakov

Uhrlandt

2013

Plasma Sources Sci. Technol.

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“…A third tube has been equipped with quartz windows at the axial ends of the discharge tube, with an anode (which is slit horizontally) and a hollow cathode in a separate part of the tube. Measuring the spectrally resolved optical depth integrated over the length of the column plasma by laser absorption spectroscopy yields absolute densities of the absorbing particles [29,30]. By shifting the tube in the radial direction, the radial variation of the particle densities was obtained.…”

Section: Study Of a Neon Columnmentioning

confidence: 99%

Study of a neon dc column plasma by a hybrid method

Uhrlandt

Franke

2002

J. Phys. D: Appl. Phys.

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The column plasma of a dc glow discharge in neon is comprehensively studied by a new self-consistent hybrid method. The method is based on the solution of the steady-state fluid equations of charge carriers and the Poisson equation using electron transport coefficients and ionization frequencies which arise from a space-dependent kinetic treatment of the electron component. The column description comprises, in addition, a space-dependent treatment of the excited particles in the plasma, the treatment of the plasma-wall interaction processes of the charge carriers and the determination of the electric field. The hybrid method provides a very efficient self-consistent column description although it avoids rough approximations often applied in fluid methods. Results of the method for a neon column plasma are compared with those of probe measurements and spectroscopic studies. The results confirm the importance of the ionization of excited neon atoms for the charge carrier production and emphasize the necessity of the detailed description of the excited states included in the column model.

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“…Also, some authors in the literature used a similar approach in dc [8] and RF [9][10][11] discharges by resolving the Boltzmann equation with the help of fluid, hybrid and other models, often presuming the electron distribution function as maxwellian. The originality of our work resides in the fact that we calculated the collisional term of the energy conservation equation corresponding to the second moment of the Boltzmann equation using a particle model, without the need to resolve this equation or to presume a maxwellian distribution for the electrons.…”

Section: Introductionmentioning

confidence: 99%

Decay Processes of Electrons in the Afterglow of High-Density CF₄, c-C₄F₈ and CF₄–H₂ Plasmas

Sasaki¹,

Kadota²

1999

Jpn. J. Appl. Phys.

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In this paper, a microscopic approach for the calculation of partial and total power dissipation from energy losses by collisions is considered and applied in the case of N 2 O low pressure RF discharges. This approach is based on a Monte Carlo technique in a particle model permitting sampling of the energy deposited by different inelastic electron-N 2 O collisions. The calculated power densities presented in this paper are in good agreement with the experimental results and those obtained by the classical macroscopic formula based on spatio-temporal integration of the product of current density and electrical field. This microscopic approach presents, however, a major advantage in comparison with the classical method (which only offers the possibility to calculate the global power dissipation) by making possible the calculation of all the power density terms, thereby permitting one to examine the relative contribution of each collision process in the power dissipation. Its application to N 2 O electronegative discharges, at 503 K gas temperature, several RF voltages and two different gas pressures shows how the power is dissipated through electron-gas processes. The power density variation is found to be proportional to the electron density variation brought about by the changes in attachment (i.e. e + N 2 O → N 2 + O − ), detachment (i.e. NO − + N 2 O → NO + N 2 O + e) and ionization (i.e. e + N 2 O → N 2 O + + 2e) processes. The role of each of these processes is fully studied with our particle model in order to explain the dissipated power variation.

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Power loss by resonance radiation from a dc neon glow discharge at low pressures and low currents

Cited by 5 publications

References 24 publications

Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Study of a neon dc column plasma by a hybrid method

Decay Processes of Electrons in the Afterglow of High-Density CF₄, c-C₄F₈ and CF₄–H₂ Plasmas

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Power loss by resonance radiation from a dc neon glow discharge at low pressures and low currents

Cited by 5 publications

References 24 publications

Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Transport mechanisms of metastable and resonance atoms in a gas discharge plasma

Study of a neon dc column plasma by a hybrid method

Decay Processes of Electrons in the Afterglow of High-Density CF4, c-C4F8 and CF4–H2 Plasmas

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Decay Processes of Electrons in the Afterglow of High-Density CF₄, c-C₄F₈ and CF₄–H₂ Plasmas