Modelling radiation spectrum of a discharge with two liquid non-metallic (tap-water) electrodes in air at atmospheric pressure

André, Pascal; Barinov, Yuri; Faure, Géraldine; Shkol'nik, S.M.

doi:10.1088/0022-3727/44/37/375203

Cited by 16 publications

(14 citation statements)

References 29 publications

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“…It is interesting to note that the fit of the OH(A-X) spectrum is not great for λ > 309 nm, which could be attributed to a non-equilibrium behavior of the rotational distribution, while the discrepancies in the case of the O 2 (b 1 -X 3 ) can be ascribed to the overlapping argon lines. Note that Andre et al [186] used the Schumann-Runge transition O 2 (B 3 − u -X 3 − g ) with similar result. At reduced pressure (0.5-5 Torr), Touzeau et al [181] compared the rotational temperature of the O 2 (b) state to the rotational temperature of the ground state and the first metastable O 2 (a 1 )-state, measured by anti-Stokes Raman scattering, and found excellent agreement.…”

Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 54%

“…The latter almost always lead to nonthermal nascent rotational distribution. A nice illustration is the work of Andre et al [186] who compared the rotational [7] temperatures of N 2 (C), O 2 (B), OH(A) and NO(A) in a glow (-like) discharge in humid air at atmospheric pressure. The rotational temperatures are 2200, 2200, 2600 and 3800 respectively.…”

Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 99%

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Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Bruggeman

Sadeghi

Schram

et al. 2014

Plasma Sources Sci. Technol.

435

431

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The gas temperature in non-equilibrium plasmas is often obtained from the plasma-induced emission by measuring the rotational temperature of a diatomic molecule in its excited state. This is motivated by both tradition and the availability of low budget spectrometers. However, non-thermal plasmas do not automatically guarantee that the rotational distribution in the monitored vibrational level of the diatomic molecule is in equilibrium with the translational (gas) temperature. Often non-Boltzmann rotational molecular spectra are found in non-equilibrium plasmas. The deduction of a gas temperature from these non-thermal distributions must be done with care as clearly the equilibrium between translational and rotational degrees of freedom cannot be achieved. In this contribution different methods and approaches to determine the gas temperature are evaluated and discussed. A detailed analysis of the gas temperature determination from rotational spectra is performed. The physical and chemical background of non-equilibrium rotational population distributions in molecular spectra is discussed and a large range of conditions for which non-equilibrium occurs are identified. Fitting procedures which are used to fit (non-equilibrium) rotational distributions are analyzed in detail. Lastly, recommendations concerning the conditions for which the gas temperatures can be obtained from diatomic spectra are formulated.

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Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 54%

Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 99%

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Bruggeman

Sadeghi

Schram

et al. 2014

Plasma Sources Sci. Technol.

435

431

View full text Add to dashboard Cite

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“…The energy of each quantum level of a diatomic molecule is assumed to be the sum of the electronic energy, vibrational energy, and rotational energy, which was characterized by the spectral terms in the Born-Oppenheimer approximation as follows [14], [19], [32]:…”

Section: Measurement Of Rotational and Vibrational Temperaturesmentioning

confidence: 99%

“…According to Kovacs (1996) [33], the factor S J J in (14), which was used to describe the rotational line strengths, could be separated into forms for the P, Q, and R branches P(J + 1) = 6(J + 1) − 10/(J + 1) (20) Q(J ) = 10/J + 10/(J + 1) (21)…”

Section: B Vibrational and Rotational Temperatures In Rga (N 2 )mentioning

confidence: 99%

“…Faure and Shkol'nik [13] measured the rotational temperature by comparing the calculated spectrum of the second positive system (SPS) of nitrogen with the experimental one; the vibrational temperature of N 2 in the C 3 u state was measured according to the Boltzmann distribution of the first vibrational levels (ν = 0, 1, 2). Andre et al [14] investigated the emission spectrum of a discharge with two liquid nonmetallic electrodes in air at atmospheric pressure. In the plasma mainly induced by electron collisions, the electron number density, which is determined by the broadening 0093-3813 © 2015 IEEE.…”

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confidence: 99%

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Determination of Spectroscopic Temperatures and Electron Density in Rotating Gliding Arc Discharge

Zhang²,

Li³

et al. 2015

IEEE Trans. Plasma Sci.

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The spectroscopic characteristics of rotating gliding arc (RGA) discharge, codriven by a magnetic field and tangential gas flow, have been investigated by optical emission spectroscopy. In argon gas, the electron density of the atmospheric RGA plasma was measured, while the vibrotatinoal temperatures were measured in nitrogen discharge. By simulating the spectral line profile determined by the joint effects of Lorentzian (Stark, van der Waals, and natural) and Gaussian (Doppler and instrumental) broadening, the electron density fluctuated in the range of 1.32×10 15 -4.56×10 15 cm −3 and 4.06×10 15 -5.74×10 15 cm −3 within the variation of argon flow rate and applied voltage, respectively. The rotational temperature in N 2 discharge was obtained by comparing the modeled optical emission spectrum with the experimental measurements. The vibrational temperature was derived from a Boltzmann plot by analyzing the spectral bands of the second positive system of N 2 (C 3 u → B 3 g ). The vibrational and rotational temperatures varied in the range of 0.1-0.13 eV and 0.42-0.44 eV, respectively, under the same operating condition, indicating that the RGA discharge is a nonequilibrium plasma. By analyzing the fundamental spectroscopic parameters of the discharge, a comprehensive understanding of RGA plasma was achieved, facilitating its application in practical industry processes.Index Terms-Electron density, plasma, rotating gliding arc (RGA), rotational temperature, vibrational temperature.

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Study of Condensed Phases, of Vaporization Temperatures of Aluminum Oxide and Aluminum, of Sublimation Temperature of Aluminum Nitride and Composition in an Air Aluminum Plasma

André

Abbaoui

Augeard

et al. 2016

Plasma Chem Plasma Process

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International audienceWith the Gibbs free energy method, we determine the molar fraction in a plasma at and out of thermal equilibrium consisting of air and aluminum for several percentages in the temperature range of 500–6000 K. We take three temperatures into account (Trot = Th; Tvib; Tex = Te). We indicate the formulae and the numerical method used to perform the calculation taking three condensed phases AlN, Al, Al2O3 into account. We show that the air percentage plays a major role to create these phases. We clarify the role plays on the vaporization temperatures and on the sublimation temperatureby the non-thermal equilibrium of the plasma. This kind of plasma is found in arc roots, near a wall, in plasmas with a high value of electrical field,… The influence of the pressures until 30 9 105 Pa. is shown on molar fraction of the chemical species, on the vaporization temperatures and on the sublimation temperature. The vaporization temperatures are given versus the thermal non equilibrium versus various mixtures (air, aluminum) and versus the pressures (10^5 Pa–30 10^5 Pa)

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Modelling radiation spectrum of a discharge with two liquid non-metallic (tap-water) electrodes in air at atmospheric pressure

Cited by 16 publications

References 29 publications

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Determination of Spectroscopic Temperatures and Electron Density in Rotating Gliding Arc Discharge

Study of Condensed Phases, of Vaporization Temperatures of Aluminum Oxide and Aluminum, of Sublimation Temperature of Aluminum Nitride and Composition in an Air Aluminum Plasma

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