Abstract
Born's approximation and the Massey-Mohr approximation are used to obtain quantum-mechanical values of the diffusion and viscosity cross sections QD and Qη for a screened Coulomb potential. The parameters are chosen to represent an ionized gas with 108 ≤ ne ≤ 1018, ne being the electron density, and 5 × 103 ≤ Te ≤ 107°K, Te being the temperature. The scattering phase shifts are also evaluated and compared with those obtained from direct numerical integration of the scattering equation. Born's approximation to the phase shift is used in a Faxén-Holtsmark type analysis to give more accurate values of the cross sections at low Te and large ne. The results are used to discuss the behavior of the electrical conductivity of a fully ionized gas.
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