A surface-stabilized ozonide triggers bromide oxidation at the aqueous solution-vapour interface.

ABSTRACT: Oxidation of bromide in aqueous environments initiates the formation of molecular halogen compounds, which is important for the global tropospheric ozone budget. In the aqueous bulk, oxidation of bromide by ozone involves a [Br•OOO^-] complex as intermediate. Here we report liquid jet X-ray photoelectron spectroscopy measurements that provide direct experimental evidence for the ozonide and establish its propensity for the solution-vapour interface. Theoretical calculations support these findings, showing that water stabilizes the ozonide and lowers the energy of the transition state at neutral pH. Kinetic experiments confirm the dominance of the heterogeneous oxidation route established by this precursor at low, atmospherically relevant ozone concentrations. Taken together, our

SUBMITTER: Artiglia L 

PROVIDER: S-EPMC5615067 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature