Associative detachment of H- + H -> H-2 + e(-)

作者：Miller K A^*; Bruhns H; Eliasek J; Cizek M; Kreckel H; Urbain X; Savin D W

来源：Physical Review A, 2011, 84(5): 052709.

DOI：10.1103/PhysRevA.84.052709

Using a merged-beams apparatus, we have measured the associative detachment (AD) reaction of H- + H -> H-2 + e(-) for relative collision energies up to E-r <= 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 (2)Sigma(+)(g) H-2(-) potential energy surface and for the effects at E-r >= 0.76 eV on the experimental results due to the formation of long-lived H-2 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 greater than or similar to 2 eV. Similar behavior has been predicted for the formation of protonium from collisions of antiprotons and hydrogen atoms.

• 出版日期2011-11-11