“…Here their cross sections can exhibit surprisingly detailed structures as a function of H-atom energy. We have found such striking behavior for H-atom impact on Ar [Van Zyl et al, 1977], N 2 and O 2 [Van Zyl et al, 1978], H 2 [Van Zyl et al, 1981], and other H atoms [Gealy and Van Zyl, 1987a], down to H energies of only 0.05 keV. But such structures persist down to even lower H energies, as nicely shown for rare-gas-atom targets by Aberle et al [1980].…”