Communication: Rovibrationally selected study of the N2+(X; v+ = 1, N+ = 0−8) + Ar charge transfer reaction using the vacuum ultraviolet laser pulsed field ionization-photoion method

摘要

By employing an electric field pulsing scheme for vacuum ultraviolet laser pulsed field ionization-photoion (PFI-PI) measurements, we have been able to prepare a rovibrationally selected PFI-PI beam of N2+(v+ = 1, N+) with not only high intensity and high quantum state purity, but also high kinetic energy resolution, allowing absolute total cross sections [σ(v+ = 1, N+)] for the N2+(X; v+ = 1, N+) + Ar, N+ = 0–8 charge transfer reaction to be measured at center-of-mass collision energies (Ecm) down to thermal energies. The σ(v+ = 1, N+ = 0–8) values determined at Ecm = 0.04–10.00 eV are in good agreement with the theoretical predictions based on the Landau-Zener-Stückelberg formulism. Taking into account the experimental uncertainties, the σ(v+ = 1, N+), N+ = 0–8, measured at Ecm = 1.56 eV are found to be independent of N+. © 2011 American Institute of Physics