Abstract
Total differential scattering cross sections for ion-atom collisions are measured and compared with predictions from various interatomic potentials. Ions with atomic numbers $6\ensuremath{\le}{Z}_{1}\ensuremath{\le}54$ and energies 2.5-400 keV are scattered by xenon through 1-6\ifmmode^\circ\else\textdegree\fi{}. For closest separations, $\ensuremath{\le}1.5{a}_{0}$, the scattering behaves nearly elastically with universal scaling properties, and individual statistical potentials give successful predictions including peak structures. For larger separations a strong ${Z}_{1}$ dependence appears and statistical potentials fail.
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