Transport‐Querschnitte für ein abgeschnittenes Coulomb‐Potential

The velocity dependent and velocity averaged transport cross sections, which appear in the kinetic theory of gases for large and weak deviations from thermodynamic equilibrium, are calculated for a Coulomb potential being constant outside an „action sphere”︁ around a collided particle. In the limit case of large relative speeds they have the usual logarithmic factor; for small relative speeds the „action sphere”︁ gives the same results as a rigid sphere for repulsion as well as for attraction. — The applicability of the calculated transport cross sections to various relaxation and transport problems is concisely described in the last section.