To the Lord D. L.

Davenant, Sir William; Gibbs, A. M.

doi:10.1093/oseo/instance.00009009

Cited by 1 publication

(3 citation statements)

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“…The behaviour of the EEDF in the vicinity of ε * (ε ≤ ε * ) could be defined more precisely by (34) obtained from equation (31) at l = 0. Therefore the energy range of validity of the Maxwell distribution (25) is at (ε) < 1.…”

Section: Procedures For Solving the Boltzmann Equationmentioning

confidence: 99%

“…Therefore, it could be expected that the body of the EEDF determined by elastic electron-neutral and electronelectron collisions is Maxwellian with a width of the distribution fixed by the elastic electron-neutral collision frequency whereas the behaviour of its tail is determined by the combined effects of the inelastic electron-neutral collisions and the electron-electron collisions. Because of the large value of λ ε (relation ( 13)), the complete kinetic model of the discharge requires accounting for the effects of non-locality [24][25][26][27][28] involved by the plasma inhomogeneity and the ambipolar electric field E A . The applicability of local models is limited to the inner region of the discharge around the discharge axis [27] where the radial density gradient and the ambipolar field are close to zero.…”

Section: Estimation Of the Discharge Parametersmentioning

confidence: 99%

“…where the dimensionless variable ε is used, and f 0 (ε * ), determined from expression (25), is the value of the EEDF at ε * = U * /T e .…”

Section: Procedures For Solving the Boltzmann Equationmentioning

confidence: 99%

See 2 more Smart Citations

Optical spectroscopy diagnostics of a helium surface wave sustained discharge. II: modelling and evaluation of experimental data

Dountchev

Koleva

Shivarova

1996

Plasma Sources Sci. Technol.

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A theoretical model for the kinetics of the processes for production and destruction of atom excited states in microwave discharges sustained in helium gas at reduced pressures by surface wave propagation is developed. The excited state population densities and the line intensities at the axis of the discharge are obtained from the stationary Boltzmann equation and the set of the rate balance equations for the n ≤ 4 excited states solved in a semi-analytical-semi-numerical manner. The numerical evaluation of the results accounts for the experimental conditions investigated in part I of the study. The comparison of the theoretical results with the experimental data (part I) for the population densities of the 2 1 P, 2 3 P, 4 1 S and 4 3 S excited states allows one to deduce the values of the mean electron energy and the electron density at the axis of the discharge. By these means, the two parts of the study complete a procedure for determination of these two plasma parameters in discharges sustained by propagating surface waves. This procedure for plasma diagnostics is extended to obtaining the radial and axial profiles of the electron density. The measured radial and axial distribution of the 504.7 nm line emitted intensity and radial distribution (through line absorption) of the 2 1 P and 2 3 P population densities (part I) are used. The axial density distribution obtained from completing the optical spectroscopy measurements with the theoretical model is in good agreement with that evaluated from radial decay measurements of the surface wave electric field intensity.

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Section: Procedures For Solving the Boltzmann Equationmentioning

confidence: 99%