Differential electron-Cu5+ elastic scattering cross sections extracted from electron emission in ion-atom collisions

We present a method of deriving energy and angle-dependent electron-ion ela stic scattering cross sections from doubly differential cross sections for electron emission in ion-atom collisions. By analyzing the laboratory frame binary encounter electron production cross sections in energetic ion-atom collisions, we derive projectile frame differential cross sections for elec trons elastically scattered from highly charged projectile ions in the ran, ae between 60 degrees and 180 degrees. The elastic scattering cross section s are observed to deviate strongly from the Rutherford cross sections for e lectron scattering from bare nuclei. They exhibit strong Ramsauer-Townsend electron diffraction in the angular distribution of elastically scattered e lectrons, providing evidence for the strong role of screening played in the collision. Experimental data are compared with partial-wave calculations u sing the Hartree-Fock model. [S1050-2947(99)03104-2].