Constrained local plasma density approximation for the calculation of the stopping power for slow ions in solids

Abstract

A constrained local plasma density approximation is presented for the calculation of the stopping power of solids for slow ions. Using the density-functional theory with the local density approximation for exchangecorrelation in the scattering potential and the constrained local plasma density approximation for averaging over effective solid-state electron densities, the stopping power for slow hydrogen and helium projectiles in different solids are calculated. The obtained results of the stopping powers for slow H and He projectiles, and the stopping power ratio R5( 1 )@(2dE/dx)He /(2dE/dx)H# in some solids are in agreement with recent experimental predictions. @S0163-1829~98!02330-3#