We present experimental and theoretical energy spectra of the electrons detached in collisions of slow ${\mathrm{C}\mathrm{l}}^{-}$ and ${\mathrm{B}\mathrm{r}}^{-}$ ions with atomic hydrogen. Nonlocal resonance theory predicts two kinds of features in the spectra: steplike structures associated with rovibrational onsets and steep rises associated with interchannel coupling, the latter being absent in a calculation using the simpler local-complex potential theory. Our experimental spectra confirm the presence of both types of structures and thus the necessity of including interchannel coupling to properly describe the product-state distribution.

• Received 6 April 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.073201