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Scattering of Ions

Differential cross-sections for the elastic scattering of He+ on Ne, Ar, Kr, and Xe were measured at different energies. At energies between 3 eV and several 100 eV, Stueckelberg oscillations could be observed. Between 1 eV and 8 eV rainbow structures were detected, but the rapid oscillations could not be resolved. The measured differential cross-sections were compared with calculated curves. The angular positions of the primary rainbows indicated a very weak interaction in the order of the polarisation energy between the He+-ion and the noble gases. Thus a 12 - 4 potential was used for the calculations since the attractive part of this potential describes the ion induced dipole potential. The depth of the potential well was obtained as < 0.05 eV for He+ -Ne, 0.19 eV for He+ -Ar, 0.22 eV for He+-Kr and 0.28 eV for He+ - Xe. A method is described which allows for correction of the nominal energy of the primary ion beam for contact potentials.