ANALYTIC POTENTIAL FOR LIGHT ION-ATOM COLLISIONS.

Based on the atomic Independent Particle Model of Green et al. a repulsive potential for the interaction between light ions (such as H** plus , He** plus , He**2** plus ) and atoms is developed. The potential is given by V(r) equals Z//1Z//2e**2u(r)/r, u(r) equals left bracket H(exp(r/da//0) minus 1 plus 1 right bracket ** minus +ZZH+ZZZ//2**0**. **4, where Z//1 and Z//2 are the atomic numbers of the ion and atom, respectively, and d is a parameter adjustable for each target atom. Scattering cross sections of He** plus on Ne, Kr and Xe calculated for the above potential have been compared with experimental results of Loftager et al. Averaged trends of experimental data are reproduced better than using other universal potentials such as Thomas-Fermi, Lenz-Jensen, Moliere or Biersack-Ziegler.