The reaction of hydrated iodide I(H2O)- with ozone: a new route to IO2− products

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We report on an experimental characterization of the isolated reaction of hydrated iodide I(H 2O) - with ozone O 3 at room temperature performed using a radio-frequency ion trap combined with a quadrupole mass spectrometer. Contrary to the oxidation reaction of the bare I - ion, the hydrated iodide I(H 2O) - primarily reacts to form I - and IO 2 - with significant absolute reaction rate constants of 2.0 ± 0.3 × 10 -10 cm 3 molecule -1 s -1 and 2.5 ± 0.3 × 10 -10 cm 3 molecule -1 s -1 while direct pathways to IO - and IO 3 - are much weaker. Quantum chemical calculations indicate that in aqueous phase and for atmospherically relevant temperatures, the presence of hydrated iodides are favored over bare I - ions, thus suggesting that the chemistry of the hydrated ions is relevant for understanding and modeling atmospheric processes at the air-water interface.

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Pages (from-to)17546-17554
Number of pages9
Publication statusPublished - Aug 2019


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