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| Titel |
SO₂ oxidation products other than H₂SO₄ as a trigger of new particle formation. Part 1: Laboratory investigations |
| VerfasserIn |
T. Berndt, F. Stratmann, S. Bräsel, J. Heintzenberg, A. Laaksonen, M. Kulmala  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 21 ; Nr. 8, no. 21 (2008-11-06), S.6365-6374 |
| Datensatznummer |
250006434
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| Publikation (Nr.) |
 copernicus.org/acp-8-6365-2008.pdf |
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| Zusammenfassung |
| Mechanistic investigations of atmospheric H2SO4 particle formation
have been performed in a laboratory study taking either H2SO4 from
a liquid reservoir or using the gas-phase reaction of OH radicals with
SO2. Applying both approaches for H2SO4 generation
simultaneously it was found that H2SO4 evaporated from the liquid
reservoir acts considerably less effective for the process of particle
formation and growth than the products originating from the reaction of OH
radicals with SO2. Furthermore, for NOx concentrations
>5×1011 molecule cm−3 the formation of new particles
from the reaction of OH radicals with SO2 is inhibited. This suggests
that substances other than H2SO4 (potentially products from
sulphur-containing peroxy radicals) trigger lower tropospheric new particle
formation and growth. The currently accepted mechanism for SO2
gas-phase oxidation does not consider the formation of such substances. The
analysis of new particle formation for different reaction conditions in our
experiment suggests that a contribution of impurities to the nucleation
process is unlikely. |
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