Dynamical effects in the interaction of ion beams with solids.
Calculations of the stopping power (SP) of ion beams in solids have been based on a homogeneous electron gas scattering off a static atom and entail at least one free parameter. Here we report dynamical simulations of ions channeled in silicon. Time-dependent density-functional theory (TDDFT) is used. The calculated SPs are in excellent agreement with the observed oscillatory dependence on atomic number. TDDFT calculations for a homogeneous electron gas demonstrate that both dynamical response and nonuniformities in the electron density are essential to reproduce the data without free parameters.
Hatcher
Ryan
R
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA.
Beck
Matthew
M
Tackett
Alan
A
Pantelides
Sokrates T
ST