Scaling in the processes of ion-atom excitation

Atom excitation, in collisions with fully stripped ions, at intermediate and high energies is studied in the framework of the semiclassical sudden-Born approximation. Two different scaling rules are manifested for transitions in the target-atom with even and odd numbers of Delta(sub fi) = l(sub f) + m(sub f) - l(sub i) - m(sub i) where l(sub i) and m(sub i), and l(sub f) and m(sub f) are the orbital and magnetic quantum numbers of the initial and the final states respectively.