Isotopic and quantum-rovibrational-state effects for the ion-molecule reaction in the collision energy range of 0.03-10.00 eV.

We report detailed quantum-rovibrational-state-selected integral cross sections for the formation of HOvia H-transfer (σ) and HDOvia D-transfer (σ) from the reaction in the center-of-mass collision energy (E) range of 0.03-10.00 eV, where (vvv) = (000), (100), and (020) and . The E inhibition and rotational enhancement observed for these reactions at E < 0.5 eV are generally consistent with those reported previously for HO + H(D) reactions. However, in contrast to the vibrational inhibition observed for the latter reactions at low E < 0.5 eV, both the σ and σ for the HO + HD reaction are found to be enhanced by (100) vibrational excitation, which is not predicted by the current state-of-the-art theoretical dynamics calculations. Furthermore, the (100) vibrational enhancement for the HO + HD reaction is observed in the full E range of 0.03-10.00 eV. The fact that vibrational enhancement is only observed for the reaction of HO + HD, and not for HO + H(D) reactions suggests that the asymmetry of HD may play a role in the reaction dynamics. In addition to the strong isotopic effect favoring the σ channel of the HO + HD reaction at low E < 0.5 eV, competition between the σ and σ of the HO + HD reaction is also observed at E = 0.3-10.0 eV. The present state-selected study of the HO + HD reaction, along with the previous studies of the HO + H(D) reactions, clearly shows that the chemical reactivity of HO toward H (HD, D) depends not only on E, but also on the rotational and vibrational states of HO(XB). The detailed σ and σ values obtained here with single rovibrational-state selections of the reactant HO are expected to be valuable benchmarks for state-of-the-art theoretical calculations on the chemical dynamics of the title reaction.