Elastic large-angle scattering of electrons by multiply charged ions

Differential cross sections for the elastic scattering of electrons by multiply charged ions have been measured at scattering angles between 32 degrees and 148 degrees. Mainly at backward angles the cross section deviates remarkably from the Rutherford cross section showing oscillations due to the structure of the ionic core. Experimental results obtained for Ar8+ ions and different Xe-q+ ions (3 less than or equal to q less than or equal to 6) are found to compare well with theoretical calculations.