Energy Loss of Excited Slow Ions in Electron Gas

The electronic energy loss and the straggling of the energy loss of the degenerate electron gas for excited H*-, He*-, He**-, and Li*-like ions were calculated. The results were compared with the corresponding characteristics for ions kept in the ground state. The linear response theory was used. The ion was described by the Hartree-Fock-Slater formalism and the medium by the dielectric function. The stopping and straggling effective charges Z$\text{}_{ef}$ for the energy loss were analysed and they were found to differ from each other and to depend on the one-electron radius r$\text{}_{s}$, on the ion atomic number Z$\text{}_{i}$, and on the number of electrons N$\text{}_{i}$ carried by the ion