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 E 0 = 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 in our case was found to be negligible.