Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9818251 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2005 | 5 Pages |
Abstract
We found that differential scattering cross sections for medium and low energy He+ and Ne+ impact on high Z-atoms were significantly enhanced compared with those calculated from the inter-atomic potential based on the Hartree-Fock-Slater atomic model coupled with the bare nuclear charge of a projectile. The enhanced scattering cross sections determined experimentally are reproduced well by a simple model that the center of gravity of target electrons is shifted toward the projectile during a large-angle collision. The shift dâ from the target nucleus is expressed as a function of inter-nuclear distance râ in terms of a dipole moment μâ=Z2edâ=αZ1erâ/r3 (Z1 and Z2: atomic numbers of projectile and target, α: polarizability, e: electron charge). The effective polarizability β (â¡Î±Z1/Z2) is expressed as a function of ion velocity v [107 cm/s], in the form β = 0.079 exp[â0.46v].
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Authors
T. Okazawa, Y. Hoshino, T. Nishimura, K. Umezawa, S. Nakanishi, Y. Kido,