Electron degradation and thermalization in CH4 gas

Kowari, Ken-ichi; Demeio, Lucio; Shizgal, Bernie D.

doi:10.1063/1.463144

Cited by 20 publications

(16 citation statements)

References 27 publications

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“…The theoretical method employed here follows closely that used previously, [18][19][20] which is based on the Boltzmann equation with collision terms for elastic and vibrationally inelastic collisions. The changes from this previous work due to the inclusion of the attachment to the molecular gas were discussed by Kowari and Shizgal.…”

Section: The Boltzmann Equationmentioning

confidence: 99%

“…The derivation of the inelastic collision operator is given in the Appendix of Ref. 18. A total inelastic cross section i j (v) is given for an inelastic process between molecular states i and j.…”

Section: The Boltzmann Equationmentioning

confidence: 99%

“…We also compare with the very recent measurements by Shimamori and Sunagawa. 26 The formalism of the present paper follows the earlier papers on electron relaxation with the inclusion of vibrationally inelastic collisions but without electron attachment, [18][19][20] and the recent paper 24 that also includes electron attachment. In Section II, the Boltzmann equation for the electron energy distribution function is considered, and the numerical solution is discussed.…”

Section: Introductionmentioning

confidence: 99%

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The coupling of electron thermalization and electron attachment in CCl4/Ar and CCl4/Ne mixtures

Kowari

Leung

Shizgal

1998

The Journal of Chemical Physics

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The one-particle Green's function method in the Dirac-Hartree-Fock framework. I. Second-order valence ionization energies of Ne through Xe Dissociative electron attachment near threshold, thermal attachment rates, and vertical attachment energies of chloroalkanesThe relaxation of a nonequilibrium distribution of electrons in a mixture of CCl 4 with either Ar or Ne is studied. In this paper, electron-CCl 4 and electron-inert gas elastic collisions, vibrationally inelastic collisions between electrons and CCl 4 , as well as the electron attachment reaction with CCl 4 , are included in the analysis. The time dependent electron energy distribution function is determined from the Boltzmann equation and the energy relaxation times are determined. The coupling of the thermalization process and the attachment process are discussed in detail. The results from the calculations are analyzed analogous to experimental studies, and the methodology of the experimental reduction of the data is studied.

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Section: The Boltzmann Equationmentioning

confidence: 99%

Section: The Boltzmann Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The coupling of electron thermalization and electron attachment in CCl4/Ar and CCl4/Ne mixtures

Kowari

Leung

Shizgal

1998

The Journal of Chemical Physics

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“…The Fokker-Planck theory was developed by Shizgal and co-workers 10,16,17 and has proven to be successful in the calculation of the EDF and thermalization times in atomic moderators, 3,10,17 mixtures, 16,18 and molecular moderators such as CH 4 and SiH 4 . 19, 20 Mozumder 21 developed the displaced pseudo-Maxwellian approximation and applied this method to studies of electron thermalization in rare gases. 21,22 Among the experimental techniques for the determination of thermalization times in rare gases are the measurements of microwave conductivity, 23-29 transient mobility, 11,30 and time delay of recombination luminescence.…”

Section: Introductionmentioning

confidence: 99%

Electron thermalization in rare gases and their mixtures

Bronić

Kimura

1996

The Journal of Chemical Physics

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A study of the parallel energy distribution of lost electrons from the central plasma of an electron cyclotron resonance ion source Rev.The time evolution and temperature dependence of electron energy distribution functions ͑EDFs͒ are studied in pure rare gases ͑He, Ne, Ar, Kr, Xe͒ as well as in their mixtures by using solutions of the Boltzmann equation. A clear difference between the gases having the Ramsauer-Townsend ͑RT͒ minimum in the momentum-transfer cross section, ͑RT gases: Ar, Kr, and Xe͒, and those without the RT minimum ͑non-RT gases: He and Ne͒ is pointed out. The influence of the position and the depth of the RT minimum on the EDF and time evolution is studied for three different initial electron energies. A formula proposed for describing thermalization time in a mixture is tested on ͑i͒ a non-RT-non-RT gas mixture, ͑ii͒ a RT-non-RT mixture and ͑iii͒ a RT-RT gas mixture. The linear combination of the reciprocal thermalization times in gas mixture with the component concentrations as weighting factors is found to be valid for gases with a similar energy dependence of the momentum-transfer cross section, m , and also for all rare-gas binary mixtures if the initial electron energy is sufficiently below the RT minimum. Conspicuous deviations from the linear relationship are observed in mixtures of gases whose energy dependence of m ͑or the stopping cross section͒ are different, and theoretical rationales for these findings are provided.

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“…Thermalization of hot electrons in molecular gases, as well as in rare gases, is of interest in understanding collisional energy loss of electrons and various transport phenomena in ionized gases [1][2][3][4][5][6][7][8]. In the case of rare gases, the Boltzmann equation reduces to a Fokker-Planck equation, and a successful eigenvalue approach has been developed by Shizgal and co-workers [1,3].…”

Section: Introductionmentioning

confidence: 99%

Electron Thermalization in Molecular Gases

Nishigori¹

2003

AIP Conference Proceedings

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Thermalization of hot electrons in molecular gases is described by a Boltzmann equation, with the Boltzmann operator consisting of a Fokker-Plank operator for elastic processes and a difference operator for inelastic ones. The eigenvalue approach of Shizgal and co-workers for a Fokker-Plank equation is extended to solve this Boltzmann equation. The inelastic interaction is much stronger than the elastic one, and two well-separated time scales are involved in the relaxation processes. This makes the analysis difficult, and the convergence of the eigenmode expansion is very slow. It is shown, however, that a high precision calculation involving a few hundred eigenmodes shows convergence.

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Electron degradation and thermalization in CH4 gas

Cited by 20 publications

References 27 publications

The coupling of electron thermalization and electron attachment in CCl4/Ar and CCl4/Ne mixtures

The coupling of electron thermalization and electron attachment in CCl4/Ar and CCl4/Ne mixtures

Electron thermalization in rare gases and their mixtures

Electron Thermalization in Molecular Gases

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