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Using a merged beams apparatus we have measured the associative detachment(AD) reaction of ${\rm H}^- + {\rm H} \to {\rm H}_2 + e^-$ for relativecollision energies up to \textit{E}$_{\rm{r}} \leq 4.83$ eV. These data extendabove the 1 eV limit of our earlier results. We have also updated our previoustheoretical work to account for AD via the repulsive $^2\Sigma^+_{\rm g}$H$_2^-$ potential energy surface and for the effects at $E_{\rm r} \ge 0.76$ eVon the experimental results due to the formation of H$_2$ resonances lyingabove the ${\rm H} + {\rm H}$ separated atoms limit. Merging both experimentaldata sets, our results are in good agreement with our new theoreticalcalculations and confirm the prediction that this reaction essentially turnsoff for $E_{\rm r} \gtrsim 2$ eV. Similar behavior has been predicted for theformation of protonium from collisions of antiprotons and hydrogen atoms.

Associative Detachment of H$^{-$ + H $\rightarrow$ H$_{2}$ + e$^{-}$