Associative Detachment of H- + H → H₂ + e⁻

الأصل · EN

Using a merged beams apparatus we have measured the associative detachment (AD) reaction of H- + H → H₂ + e- for relative collision energies up to Er ≤ 4.83 eV. These data extend above the 1 eV limit of our earlier results. We have also updated our previous theoretical work to account for AD via the repulsive ²Σ+ g H₂- potential energy surface and for the effects at E r ≥ 0.76 eV on the experimental results due to the formation of H₂ resonances lying above the H + H separated atoms limit. Merging both experimental data sets, our results are in good agreement with our new theoretical calculations and confirm the prediction that this reaction essentially turns off for E r 2 eV. Similar behavior has been predicted for the formation of protonium from collisions of antiprotons and hydrogen atoms.