The energy dependences of the exothermic proton transfer from ArH(+) to various neutrals was investigated in the energy regime from thermal to approx. 1 eV. All rate coefficients obtained are fast (within a factor of two of the Langevin or ADO limiting values) and show only slight energy dependences. From the equilibrium ArH(+) / H3(+) in Ar-H2 mixtures a difference of the proton affinities between Ar and H2 of Delta Pa = 0.55 eV was obtained. The exchange reactions H(+) + D2 yields HD + D(+) and D(+) + H2 yields HD + H(+) show energy dependences which are in full agreement with theoretical predictions taking into account statistical factors and the energetics of the reactions.
Symposium on Atomic and Surface Phys., 1982 Contrib.
- Pub Date:
- Ion Atom Interactions;
- Atomic and Molecular Physics