Results of a differential time-of-flight energy-loss study of ${\mathrm{H}}^{\mathrm{-}}$+Na collisions in the 100–500-eV laboratory collision energy range are discussed. It is shown that the relative importance of electron-detachment processes in the total stripping cross section increases with collision energy. The relative magnitude of Na excitation processes is determined. As in negative-ion–molecule collisions, charge exchange to the ${\mathrm{Na}}^{\mathrm{-}}$${(\mathrm{}}^3$P) shape resonance lying at 80 meV may be important.

• Received 7 December 1984

DOI:https://doi.org/10.1103/PhysRevA.32.883