Electronic Transitions in Slow Collisions of Atoms and Molecules. III. Eikonal Approximation for Nonclassical Scatterings

Characteristic quantum features in atomic collisions are analyzed in the eikonal approximations. Numerical illustrations are given for the (${\mathrm{He}}^{+}$, He) system, using a set of model potentials which provide a reasonable description of the interaction between the ground states of ${\mathrm{He}}^{+}$ and He in the quasiadiabatic (diabatic) limit.