Kinetic studies of the H2(a3Σ+g→ b2Σ+u) continuum emission of an ArH2 mixture pumped by e-beam

Godart, J.; Puech, Vincent

doi:10.1016/0301-0104(80)85081-6

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…2) If the value of the dissociation degree is determined by one of the existing methods (see [66,67]) then the effective lifetime of atoms in plasma may be determined with the help of the rate of dissociation and the corresponding balance equation for atoms. 16 In both cases the method proposed in the present work is giving new opportunities. Further improvements of the methods developed in present work need more detailed information about the elementary processes especially those about the cross sections of electronic-vibrational (better electronic-vibro-rotational) a 3 Σ + g , v ′ , N ′ ← X 1 Σ + g , v, N electron impact excitation and the rate coefficients of the quenching of a 3 Σ + g , v ′ , N ′ levels in collisions with electrons, atoms and molecules.…”

Section: Discussionmentioning

confidence: 85%

“…The total population of all 12 sublevels may reach 10 11 cm −3 at low pressures. The rate coefficients of the Ar*→H 2 excitation transfer are approximately 10 −10 cm 3 s −1 [16]. Thus the rate of the continuum excitation in the reaction is about 10 16 cm −3 s −1 .…”

Section: S 2 3p 5 4s Level Populations Of Armentioning

confidence: 93%

“…They were stimulated by molecular spectroscopy and quantum chemistry [1][2][3][4][5][6][7], investigations of hydrogen containing plasmas [8][9][10] and astrophysics [11,12]. Since the first work of Houtermans [13] the a 3 Σ + g → b 3 Σ + u transition has been studied as a possible laser system (see [14][15][16][17] and Refs. therein).…”

Section: Introductionmentioning

confidence: 99%

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uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

Lavrov

Melnikov

Käning³

et al. 1999

Phys. Rev. E

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For the first time the emission of the radiative dissociation continuum of the hydrogen molecule (a 3 Σ + g → b 3 Σ + u electronic transition) is proposed to be used as a source of information for the spectroscopic diagnostics of non-equilibrium plasmas. The detailed analysis of excitation-deactivation kinetics, rate constants of various collisional and radiative transitions and fitting procedures made it possible to develop two new methods of diagnostics of: (1) the ground X 1 Σ + g state vibrational temperature T vib from the relative intensity distribution, and (2) the rate of electron impact dissociation (d[H 2 ]/dt) diss from the absolute intensity of the continuum. The known method of determination of T vib from relative intensities of Fulcher-α bands was seriously corrected and simplified due to the revision of d → a transition probabilities and cross sections of d ← X electron impact excitation. General considerations are illustrated with examples of experiments in pure hydrogen capillary-arc and H 2 +Ar microwave discharges. In pure H 2 plasma the values of T vib obtained by two independent methods are in rather good accordance (T vib =3000-5000 K). In the H 2 +Ar microwave plasma it was observed for the first time that the shape of the continuum depends on the ratio of the mixture components. Absorption measurements of the population of the 3s 2 3p 5 4s levels of Ar together with certain computer simulations showed that the Ar*→H 2 excitation transfer plays a significant role. In our typical conditions (power flux: 4 W cm −2 , pressure p = 0.5 mbar, H 2 :Ar=1:1) the following values were obtained for the microwave discharge: (d[H 2 ]/dt) diss ≈ 2.5 − 5 · 10 17 cm −3 s −1 . The contribution of the excitation transfer is about 10-30% of the total population of the a 3 Σ + g state.

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Section: Discussionmentioning

confidence: 85%

Section: S 2 3p 5 4s Level Populations Of Armentioning

confidence: 93%

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uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

Lavrov

Melnikov

Käning³

et al. 1999

Phys. Rev. E

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Kinetic Study of Electron Beam Excited Argon

Bretagne

Godart

Puech

1983

Contrib Plasma Phys

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An experimental and theoretical study of the interaction between Argon and a high-energy short-pulse electron beam is reported. A theoretical model describing the argon atom and molecule with ten effective levels and taking into account all the reactions that these levels mny suffered is developped. A comparison, based on time resolved V.U.V. and visible fluorescences and electron density determination, between the theoretical and experimental results shows the ability of our model to describe the interaction in all the experimental range, 400 < P < 5000 Torr, studied.

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Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

Vazquez

Alhomsi

Bauville

et al. 2018

Plasma Processes & Polymers

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The present work is devoted to the precise spatiotemporal mapping of the absolute density of Ar(1s5) in a ns‐pulsed argon plasma jet. The plasma impinges on glass and alumina targets at floating potential placed 5 mm away from the reactor's nozzle. Under these conditions, diffuse discharges are established in the small gas gap. As so, the line‐of‐sight absolute density of Ar(1s5) is effectively evaluated via laser absorption spectroscopy. The application of the Abel‐inversion is also demonstrated for different operating conditions leading to the precise radial mapping of the Ar(1s5) absolute density. The influence of each target is studied for two gas flow rates, 0.3 and 0.4 l min−1. The temporal density profiles over a voltage pulse period reveal two maxima related with the Ar(1s5) production in the streamer head and in the residual diffuse plasma channel. Furthermore, the maximum Ar(1s5) axial/radial density (∼1013 − 3.5 × 1014 cm−3) depends on the target material and gas flow rate. Finally, the plasma is proved to be very effective for the fast desorption of organic molecules (bibenzyl) deposited on both targets. The results obtained suggest that the desorption of bibenzyl is due to the production of high Ar(1s5) densities at the close vicinity of the targets.

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Kinetic studies of the H2(a3Σ+g→ b2Σ+u) continuum emission of an ArH2 mixture pumped by e-beam

Cited by 13 publications

References 24 publications

uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

Kinetic Study of Electron Beam Excited Argon

Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

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Kinetic studies of the H2(a3Σ+g→ b2Σ+u) continuum emission of an ArH2 mixture pumped by e-beam

Cited by 13 publications

References 24 publications

uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

uv continuum emission and diagnostics of hydrogen-containing nonequilibrium plasmas

Kinetic Study of Electron Beam Excited Argon

Ar(1s5) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules

Contact Info

Product

Resources

About

Ar(1s₅) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules