DYNAMIC PLASMA SCREENING EFFECTS ON ELECTRON-ION COLLISIONAL EXCITATIONS IN A GENERALIZED LORENZIAN (KAPPA)-DISTRIBUTION PLASMA

Dynamic plasma screening effects are investigated on 1s --> 2p dipole transition probabilities for electron-impact excitation of hydrogenic ions in a generalized Lorenzian (kappa) velocity distribution plasmas. The electron-ion interaction potential is obtained by introduction of the plasma dielectric function. A semiclassical straight-line traject ory method is applied to the path of the projectile electron in order to visualize the dynamic plasma screening effects on the semiclassical transition probabilities as a function of the impact parameter and th e collision energy. The transition probability including the dynamic p lasma screening effect is found to be always greater than that includi ng the static plasma screening effects. It is also found that the dyna mic plasma screening effects on the electron-ion collisional excitatio ns in the Lorenzian velocity distribution plasmas are more effective t han those in the Maxwellian velocity distribution plasmas. (C) 1998 Am erican Institute of Physics. [S1070-664X(98)00807-6]