New Measurements and Calculations on the Kinetics of an Old Reaction: OH + HO₂ → H₂O + O₂.

ABSTRACT: Literature rate coefficients for the prototypical radical-radical reaction at 298 K vary by close to an order of magnitude; such variations challenge our understanding of fundamental reaction kinetics. We have studied the title reaction at room temperature via the use of laser flash photolysis to generate OH and HO₂ radicals, monitoring OH by laser-induced fluorescence using two different approaches, looking at the direct reaction and also the perturbation of the slow OH + H₂O₂ reaction with radical concentration, and over a wide range of pressures. Both approaches give a consistent measurement of k_1,298K ∼1 × 10^-11 cm³ molecule^-1 s^-1, at the lowest limit of previous determinations. We observe, e

SUBMITTER: Speak TH 

PROVIDER: S-EPMC10301680 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature