Ion-molecule interactions in crossed-beams

Interactions of the ions N+, F+, and CO2+ with H2 and/or its isotopes were examined using the crossed-beam technique in the low (< 4 eV) initial relative energy. For the reaction N+(3P) + H2 → NH+ + H, complex formation dominates up to 1.9 eV and a substantial interaction occurs between all collision partners up to 3.6 eV. The distribution of N+ scattered nonreactively from H2 also showed a long-lived complex channel below 1.9 eV. The reaction F+(3P) + H2 →FH+ + H proceeded by a direct reaction mechanism at 0.20 to 1.07 eV. The reaction CO2+ + D2 → DCO2+ + D gives asymmetric product distributions at 0.27 eV and above, indicating a direct reaction mechanism. Results indicated that there are probably barriers in the exit channels for DCO2+, DCO+, and D2O+ products. The electronic state distributions of the N+, F+, and CO2+ beams was investigated using beam attenuation and total luminescence techniques