Collision energy dependence of the rotational-state-resolved cross section in the CH (v = 0, J, F_i) + O₂→ OH(A) + CO reaction

A velocity variable rotational-state-selected CH (v = 0, J, F_i) beam has been prepared by using an electric hexapole and applied to the CH (v = 0, J, F_i) + O₂→ OH(A) + CO reaction. The CH rotational-state-resolved reaction cross sections have been determined under the beam-cell condition at the collision energy range of 0.06–0.18 eV. The N = 2 rotational states are 2–3 times more reactive than the other states (N = 1, 3). In addition, we observed a noticeable difference in the collision energy dependence of the cross section between the CH rotational states. The reaction cross section for the N = 2 states has a gentle negative dependence on collision energy, while, the reaction cross section for the N = 1 states has a positive dependence on collision energy.