Ab initio calculations 2 Atomic numbers 2 Atoms 2 Bound electrons 2 Energy dissipation 2 Energy loss 2 Experimental data 2 Friedel sum rule 2 Helium 2 High energy 2 Ion energies 2 Ions 2 Loss measurement 2 Rutherford backscattering spectroscopy 2 Rutherford backscattering techniques Theoretical calculations 2 Theoretical framework 2 Theoretical study 2 Transport cross-section 2 Valence electron 2 Zinc 2