Elastic Scattering of Electrons from Heavy Multiply Charged Ions (${\mathrm{Xe}}^{6+}$, ${\mathrm{Xe}}^{8+}$, and ${\mathrm{Ba}}^{2+}$)

Elastic scattering of electrons from heavy, multiply charged ions has been studied at collision energies below 50 eV. Differential cross sections have been measured at scattering angles between 30° and 90° for the ions ${\mathrm{Xe}}^{6+}$, ${\mathrm{Xe}}^{8+}$, and ${\mathrm{Ba}}^{2+}$. In the angular range considered, experimental values deviate strongly from the Rutherford cross section, revealing the importance of short-range contributions to the scattering amplitude. The measured cross sections agree well with theoretical predictions obtained from Hartree Fock calculations.