Effect of enhanced collision energy on product vibrational excitation for the proton transfer reaction: O−+HF→F−+OH(v=0,1)

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Abstract
Relative vibrational state populations are determined for the OH product in the reaction O−+HF→F−+OH(v=0,1) as a function of reactant center‐of‐mass collision energy in a flow‐drift tube. The OH(v=0,1) vibrational states are measured using laser‐induced fluorescence detection, and the relative vibrational signals are converted to absolute populations by normalizing the results at thermal energy to the absolute measurement by Hamilton e t a l. [Chem. Phys. Lett. 9 4, 4 (1983)]. At thermal energy, the OH(v=1) fractional population {OH(v=1)/[OH(v=0)+OH(v=1)]} is 0.18±0.01. At enhanced average collision energies of 9.6 and 15.4 kJ mol−1, the OH(v=1) population increases to 0.25±0.02 and 0.33±0.03, respectively. The results are considered in terms of the deep attractive well in the ion‐molecule potential‐energy surface which dominates the reactiondynamics.