K Kitamori et al 1980 J. Phys. D: Appl. Phys. 13 535 doi:10.1088/0022-3727/13/4/008
K Kitamori, H Tagashira and Y Sakai
Show affiliationsDevelopment of the electron avalanche in argon has been studied at E/N=141, 283 and 566 Td by two exact Boltzmann equation methods, a Fourier expansion (FE) of the distribution function of electrons by Tagashira et al. (1978), and a direct estimation of moments (DEM) of the electron density distribution in the real space by starting from a Boltzmann equation. Elastic momentum transfer, total electronic excitation and ionisation collisions are considered. The electron swarm parameters obtained by FE agree exactly with those by DEM, justifying the expansion used in FE, and the swarm parameters obtained by two-term expansion (TE) are in good agreement with those obtained by the exact FE and DEM except the longitudinal diffusion coefficient DL and a higher order coefficient D3 at E/N=566 Td and the transverse diffusion coefficient DT at all the E/N studied, suggesting that the disagreement with DL and D3 is due simply to breakdown of TE at high E/N but the disagreement with DT is due to more essential insufficiency in TE. The electron velocity distributions are also obtained and discussed.
51.20.+d Viscosity, diffusion, and thermal conductivity
51.10.+y Kinetic and transport theory of gases
51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
Issue 4 (14 April 1980)
K Kitamori et al 1980 J. Phys. D: Appl. Phys. 13 535
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