Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Wendt, Martin

doi:10.1088/0022-3727/44/12/125201

Cited by 20 publications

(19 citation statements)

References 41 publications

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“…Figures 2-4 present a comparison between our NEC results and those found in literature and given by different authors for pure argon, helium, nitrogen and carbon plasmas at atmospheric pressure. For the obtained results of pure argon as shown in figure 2, we have a good agreement for the case of plasma radius R P = 0 mm, corresponding to an optically thin plasma, and R P = 1 mm with the results given by Cressault et al [26] and Wendt [35]. A disagreement has been observed in all the temperature intervals and whatever the values of plasma radius with the NEC results calculated by Menart et al [30].…”

Section: Pure He Ar N 2 and Csupporting

confidence: 82%

“…We have supposed the case of a 18 l reactor which contains a catalyst filled anode with [C 100−x−y−z , B z ,Ni x /Co x ,Y y ] and the end to end anodecathode were submerged in an atmosphere of He-Ar/N 2 mixture. A comparisons of the NECs obtained results for pure helium, argon, nitrogen and carbon for a temperature range 1 kK-30 kK were made with those available in the literature for pure gases [26,[29][30][31][32][33][34][35]. A brief outline about the reasons of the observed deviations was given in order to evaluate the effect of the input data such as the used line data tables or atomic levels and the Stark broadenings methods.…”

Section: Introductionmentioning

confidence: 99%

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Net emission coefficient of complex thermal plasmas used in SWNT synthesis

Hannachi¹,

Nasr²,

Cressault³

et al. 2018

J. Phys. D: Appl. Phys.

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The calculation of net emission coefficient NEC is done for mixtures He-Ar/N 2 -[C 100−x−y−z ,B z ,Ni x /Co x ,Y y ] used in the synthesis of single-wall carbon nanotubes SWNTs by arc discharge technique, at pressure of 60 kPa and at temperature interval going from 1 kK to 30 kK. These mixtures contain helium-argon as a gaseous atmosphere, nitrogen-boron as a doping atoms and a carbon anode filled with yttrium-nickel/cobalt as catalysis. Different proportions of metallic catalysts are considered going from 0.01 atomic% (at%) to 5 at%. Whereas for doping atoms the concentration amounts are much higher and do not exceed 8 at% for boron and 50% for nitrogen. The results of NECs are obtained by summing over all wavelengths, the contributions of atomic and molecular continuum, results of free-free and free-bound transitions, and line and molecular bands emissions corresponding to bound-bound transitions. Doppler broadening, resonance, van der Waals, electron and ion Stark broadening are taken into account for the calculation of the lines widths. As Stark broadening is the most important broadening mechanism at intermediate and high temperature, an empirical correction factors determined for some resonance lines, are added to the semi-empirical Stark formulas for a best reproducing of the experimental Stark widths. The comparisons of the NECs of the pure plasmas of argon, helium, nitrogen and carbon to those given in literature present an acceptable agreement. For the studied mixtures containing He-Ar/N 2 -[C 100−x−y−z , z B z , Ni x /Co x ,Y y ], the obtained results show that the addition of boron or the nitrogen induces a few little changes in the NEC, in contrary to the metal catalysts where we noted a considerable increase in the plasma emission especially at low temperatures. The effect of the addition of yttrium in carbon anode even in a small amount (<0.1 at%) affects strongly the NEC compared to that of cobalt or nickel which have given similar results.

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Section: Pure He Ar N 2 and Csupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Net emission coefficient of complex thermal plasmas used in SWNT synthesis

Hannachi¹,

Nasr²,

Cressault³

et al. 2018

J. Phys. D: Appl. Phys.

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“…The considered data have been useful for articles with radiative emission and absorption as the subject. Examples of such papers consider a line-by-line approach of determining emission coefficients for thermal plasmas consisting of monoatomic species [137]; theoretically obtained results for radiative emission for argon and copper thermal plasmas [138]; net emission coefficients for Ar-Fe thermal plasmas [139,140]; complex thermal plasmas, which are used in single-wall carbon nanotube synthesis [141]; net emission coefficients at atmospheric pressure for argon-aluminum, argon-iron, and argon-copper mixtures in welding processes using plasmas [142]; research of the L-shell absorption of open-M-shell Ge plasmas and its effect of autoionization resonance broadening [143]; and autoionization widths of open-M-shell Ge ions and their influence on inner-shell absorption [144].…”

Section: Radiative Propertiesmentioning

confidence: 99%

Forty Years of the Applications of Stark Broadening Data Determined with the Modified Semiempirical Method

Dimitrijević

2020

Data

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The aim of this paper is to analyze the various uses of Stark broadening data for non-hydrogenic lines emitted from plasma, obtained with the modified semiempirical method formulated 40 years ago (1980), which are continuously implemented in the STARK-B database. In such a way one can identify research fields where they are applied and better see the needs of users in order to better plan future work. This is done by analysis of citations of the modified semiempirical method and the corresponding data in international scientific journals, excluding cases when they are used for comparison with other experimental or theoretical Stark broadening data or for development of the theory of Stark broadening. On the basis of our analysis, one can conclude that the principal applications of such data are in astronomy (white dwarfs, A and B stars, and opacity), investigations of laser produced plasmas, laser design and optimization and their applications in industry and technology (ablation, laser melting, deposition, plasma during electrolytic oxidation, laser micro sintering), as well as for the determination of radiative properties of various plasmas, plasma diagnostics, and investigations of regularities and systematic trends of Stark broadening parameters.

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“…The parameters E u , A ul and g u for each considered line are obtained from the NIST atomic spectra database [19]. The partition function Z s for each emitting species is calculated using the Planck-Larkin function [20]. The total density n 0 for the emitting species is calculated based on the principle of minimization of the Gibbs free energy with the code described in [21].…”

Section: Spectral Simulationsmentioning

confidence: 99%

Temperature and pressure profiles of an ablation-controlled arc plasma in air

Becerra

Pettersson

Franke

et al. 2019

J. Phys. D: Appl. Phys.

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Experimental measurements of the spatial distribution of temperature and composition of ablation-controlled arc plasmas are a key to validate the predictions of metal evaporation and polymer ablation models. Thus, high-speed photography and space-resolved spectroscopic measurements have been performed to characterize a stable air arc plasma jet controlled by ablation of a polymer nozzle made of Polyoxymethylene copolymer (POM-C) or polyamide (PA6). The spectroscopic analysis is performed along a plane perpendicular to the arc jet axis for a current of 1.8 kA, corresponding to an estimated current density of ~65 A mm−2. Temperature and partial pressure profiles of the plasma for copper, hydrogen and carbon in the gas mixture are estimated as an inverse optimization problem by using measured side-on radiance spectra and radiative transfer spectral simulations. It is shown that the generated ablation-controlled arc has a complicated, non-uniform gas composition. Thus, the generated arc jet has a thin metallic core with a lower almost constant hydrogen pressure, surrounded by a thicker hydrogen and carbon mantle at partial pressures slightly lower than atmospheric pressure. The separation of hydrogen and carbon in the core is a consequence of demixing of the polymer vapour in the plasma. It is found that the overall shape of the temperature and pressure profiles obtained for the arc plasmas with the POM-C and PA6 nozzles are similar although differ in peak values and width.

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Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Cited by 20 publications

References 41 publications

Net emission coefficient of complex thermal plasmas used in SWNT synthesis

Net emission coefficient of complex thermal plasmas used in SWNT synthesis

Forty Years of the Applications of Stark Broadening Data Determined with the Modified Semiempirical Method

Temperature and pressure profiles of an ablation-controlled arc plasma in air

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