Department of Applied Physics, Okayama University of Science
Abstract
Based on the dielectric function method, the analytical formulas are presented for the energy loss and the straggling of low-velocity heavy atoms with atomic number Z_1 passing through the degenerate electron gas. The spatial sizeΛ of the electron cloud on projectiles is newly determined according to the statistical variational method by taking into account the static screening effect of conduction electrons. The analytical formulas obtained here have the Z_1-dependences different from those by the existing theories in spite of the same velocity dependence. It is found that the screening effect on Λ enlarges thelectronic stopping of the media by a constant value regardless of Z_1
