Calculation of Electron Swarm Parameters in Tetrafluoromethane

Idris H. Salih; Mohammad M. Othman; Sherzad A. Taha

doi:10.14500/aro.10671

Idris H. Salih Tishk International University, Erbil, Kurdistan Region – F.R. Iraq http://orcid.org/0000-0001-8235-3923
Mohammad M. Othman Department of Physics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan Region – F.R. Iraq http://orcid.org/0000-0002-8244-2288
Sherzad A. Taha Department of Physics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan Region – F.R. Iraq http://orcid.org/0000-0001-5469-3760

Keywords: Boltzmann equation, CF4, Electron discharge, Electron swarm parameters, Kinetic and transport theory

Abstract

The electron swarm parameters and electron energy distribution function (EEDF) are necessary, especially on
understanding quantitatively plasma phenomena and ionized gases. The EEDF and electron swarm parameters including the reduce effective ionization coefficient (α-η)/N (α and η are the ionization and attachment coefficient, respectively), electron drift velocity, electron mean energy, characteristic energy, density normalized longitudinal diffusion coefficient, and density normalized electron mobility in tetrafluoromethane (CF4) which was analyzed and calculated using the two-term approximation of the Boltzmann equation method at room temperature, over a range of the reduced electric field strength (E/N) between 0.1 and 1000 Td
(1Td=10-17 V.cm2), where E is the electric field and N is the gas density of the gas. The calculations required cross-sections of the electron beam, thus published momentum transfer, vibration, electronic excitation, ionization, and attachment cross-sections for CF4 were used, the results of the Boltzmann equation in a good agreement with experimental and theoretical values over the entire range of E/N. In all cases, negative differential conductivity regions were found. It is found that the calculated EEDF closes to Maxwellian distribution and decreases sharply at low E/N. The low energy part of EEDF flats and the high-energy tail of EEDF increases with increase E/N. The EEDF found to be non-Maxwellian when the E/N> 10Td, having
energy variations which reflect electron/molecule energy exchange processes. In addition, limiting field strength (E/N)limit has been calculated from the plots of (α-η)/N, for which the ionization exactly
balances the electron attachment, which is valid for the analysis of insulation characteristics and application to power equipment.

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Author Biographies

Idris H. Salih, Tishk International University, Erbil, Kurdistan Region – F.R. Iraq

is a Lecturer at the Department of Physics, Faculty of Education, Tishik International University.

He got the B.Sc. degree in Physics and the PhD. Degree in Technical Science. His research interests are in electronic, Telecommunication and plasma physics. Dr. Idris is a member of Syndicate of Kurdistan Engineering, Union of Kurdistan Teachers, Kurdistan Physics Society and GEDC.

Mohammad M. Othman, Department of Physics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan Region – F.R. Iraq

is an Assistant Prof. at the Department of Physics, College of Education, Salahaddin University.

He got the B.Sc. degree in Physics, the M.Sc. degree in Nuclear Physics and the PhD. Degree in theoretical physics/Plasma. His research interests are in plasma physics, kinetic theory and gas discharge. Dr. Mohammad is a member of Union Kurdistan Teachers and Kurdistan Physics Society.

Sherzad A. Taha, Department of Physics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan Region – F.R. Iraq

is an Assistant Prof. at the Department of Physics, College of Education, Salahaddin-Erbil University.

He got the B.Sc. degree in Physics, the M.Sc. degree in Solid State Physics and the PhD. Degree in Atomic Physics. His research interests are in Atomic Physics, plasma, and Semiconductor physics. Dr. Sherzad is a member of Union Kurdistan Teachers, Iraqi Society for Physics and Mathematics, and Kurdistan Society for Physics.

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