@article{Salih_Othman_Taha_2020, title={Calculation of Electron Swarm Parameters in Tetrafluoromethane}, volume={8}, url={http://aro.koyauniversity.org/index.php/aro/article/view/ARO.10671}, DOI={10.14500/aro.10671}, abstractNote={<p>The electron swarm parameters and electron energy distribution function (EEDF) are necessary, especially on<br>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&nbsp; 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<br>(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&gt; 10Td, having<br>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<br>balances the electron attachment, which is valid for the analysis of insulation characteristics and application to power equipment.</p&gt;}, number={2}, journal={ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY}, author={Salih, Idris H. and Othman, Mohammad M. and Taha, Sherzad A.}, year={2020}, month={Sep.}, pages={22-28} }