Is the Reaction Rate Coefficient for OH + HO₂ → H₂O + O₂ Dependent on Water Vapor?

ABSTRACT: A critical reaction affecting the oxidation chemistry in the middle-to-upper atmosphere occurs between hydroxyl (OH) and hydroperoxyl (HO₂). The reaction rate coefficient for OH + HO₂ → H₂O + O₂, here called k _OH+HO2, has challenged laboratory kineticists for 50 years. However, several measurements from the past 30 years had approached a rough consensus until the publication of a new study that examined, for the first time, the water vapor dependence of this reaction. According to the study, k _OH+HO2 is not the recommended value of 11.0 × 10^-11 cm³ molecule^-1 s^-1, but instead, a water-dependent (∼1 × 10^-11 + 2.17 × 10^-28[H₂O]) cm³

SUBMITTER: Brune WH 

PROVIDER: S-EPMC11672144 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature