Mean Radiative Lifetime of Vibrationally Excited (υ = 9) Hydroxyl. Rate of the Reaction of Vibrationally Excited Hydroxyl (υ = 9) with Ozone

Abstract

The mean radiative lifetime of vibrationally excited (υ = 9) ground-state hydroxyl was measured in a fast-flow system. Excited hydroxyl was generated by reaction of H with O3 at the entrance of a flow tube, and the decay of 2.15-μ radiation from the OH (9–7) band was measured down the tube. After correcting the decay rate for wall quenching and reaction with ozone, the lifetime was found to be (6.4 ± 1.4) × 10−2 sec. The effect of ozone concentration on the decay rate yielded a rate constant of (7.7 ± 0.3) × 10−12 cm3 molecule−1·sec−1 for the reaction of OH (υ = 9) with O3.