Multiple-scattering and ion effective charge deviation effect on the energy spectrum form of particles back-scattered from a thick target

The multiple-scattering, straggling and the ion effective charge deviation effect on the energy spectrum form of back-scattered nitrogen ions having the initial energy E0 = 7.4 MeV is described. The multiple-scattering effect depends on the geometrical conditions of the experiment and the atomic number of the target atoms. To describe adequately the multiple-scattering of multicharged ions it is necessary to fit screened Coulomb potential by introducing the effective charge of ions. The influence of the straggling was found to be negligible. (author)