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

Artiglia, Luca (author)
Edebeli, Jacinta (author)
Orlando, Fabrizio (author)
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Chen, Shuzhen (author)
Lee, Ming-Tao (author)
Stockholms universitet,Fysikum,Paul Scherrer Institut, Switzerland
Arroyo, Pablo Corral (author)
Gilgen, Anina (author)
Bartels-Rausch, Thorsten (author)
Kleibert, Armin (author)
Vazdar, Mario (author)
Carignano, Marcelo Andres (author)
Francisco, Joseph S. (author)
Shepson, Paul B. (author)
Gladich, Ivan (author)
Ammann, Markus (author)
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 (creator_code:org_t)
2017-09-26
2017
English.
In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 8
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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 center dot 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 results provide a strong case of different reaction kinetics and mechanisms of reactions occurring at the aqueous phase-vapour interface compared with the bulk aqueous phase.

Subject headings

NATURVETENSKAP  -- Annan naturvetenskap (hsv//swe)
NATURAL SCIENCES  -- Other Natural Sciences (hsv//eng)
NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

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