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Using the theoretical results published previously (Beier 1973), experimental data of the scattering of 'Li*-ions at Ar are evaluated. From the diffraction effect detailed statements about the repulsive term oftheinteraction potentialaregiven. The simple Yukawa type screened Coulomb potential is very well suited for describing the small angle scattering between ions and atoms. A modification of this potential can be clearly excepted. The evaluation method for determining the potential parameters is described in detail and gives for 'Li+-Ar the parameters R , = 0.289 A and Zaeff = 54.In the region of the first undulation maximum the influence of the attractive potential term is found experimentally. Certainly the experiments show with decreasing scattering angle a shape of approximately 1/02 which is caused by inelastic scattering. Because of the covered elastic scattering in the region of very small angles at the present time no results about the attractive potential term can be given. For this purpose the clastic scattering alone below the undulation region has to be measured.

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