Elastic electron-ion collisions in a Lorentzian plasma

Plasma screening effects on elastic electron-ion collision processes in a L orentzian (kappa)-distribution plasma are investigated using the eikonal me thod. The electron-ion interaction potential is obtained by introducing a p lasma dielectric function epsilon(kappa). The semiclassical straight-line t rajectory method is applied to the path of a projectile electron in order t o investigate the variation of the eikonal phase as a function of impact pa rameter and spectral index kappa. In the first-order eikonal approximation, the dynamic plasma screening effect on the eikonal phase is found to be a static screening effect, and depends only on the Debye length and spectral index. The position of the maximum of the differential elastic eikonal cros s-section recedes from the ion core with increasing spectral index. The pla sma screening effect on the eikonal cross-section increases with decreasing spectral index.