SCREENING MODIFICATION ON THE TRAJECTORY OF THE PROJECTILE ELECTRON IN THE ELECTRON-ION EXCITATION IN DENSE-PLASMAS

A behavior of the trajectory of the projectile electron in the electro n-impact excitation of hydrogenic ions in dense plasmas is investigate d using modified hyperbolic-orbit method in the semiclassical approxim ation. The interaction potential is obtained by the Debye-Huckel model of the screened Coulomb interaction for the interesting domain of the Debye length LAMBDA/a(Z) greater-than-or-equal-to 10. The screening e ffects on the eccentricity of the projectile path produce a significan t change in the excitation cross section near excitation threshold. Th e result shows that the trajectory of the projectile electron becomes a hyperbolic path rather than a parabolic path because of the plasma-s creening effects. For higher incident energies, the plasma-screening e ffects on the projectile electron are decreased.