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Lakey, PSJ, Berkemeier, T, Krapf, M et al. (9 more authors) (2016) The effect of viscosity and diffusion on the HO₂ uptake by sucrose and secondary organic aerosol particles. Atmospheric Chemistry and Physics Discussions. ISSN 1680-7367
Abstract
We report the first measurements of HO₂ uptake coefficients, γ, for secondary organic aerosol particles (SOA) and for the well-studied model compound sucrose which was doped with copper. Above 65% relative humidity (RH), γ for copper doped sucrose aerosol particles equalled the surface mass accommodation coefficient α= 0.22 ± 0.06 but decreased to γ = 0.012 ± 0.007 upon decreasing the RH to 17 %. The trend of γ with RH can be explained by an increase in aerosol viscosity, as demonstrated using the kinetic multi-layer model of aerosol surface and bulk chemistry (KM-SUB). SOA from two different precursors, α-pinene and 1,3,5- trimethylbenzene (TMB), was investigated, yielding small uptake coefficients of γ < 0.001 and γ = 0.004 ± 0.002, respectively. It is postulated that the larger values measured for TMB derived SOA compared to α-pinene derived SOA are either due to differing viscosity, a different liquid water content of the aerosol particles or a HO₂ + RO₂ reaction occurring within the aerosol particles.
Metadata
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Copyright, Publisher and Additional Information: | © Author(s) 2016. This is an open access discussion paper under the terms of the Creative Commons Attribution License (CC-BY 3.0). | ||||
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Institution: | The University of Leeds | ||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) | ||||
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Depositing User: | Symplectic Publications | ||||
Date Deposited: | 25 Sep 2018 10:18 | ||||
Last Modified: | 23 Jun 2023 22:36 | ||||
Status: | Published | ||||
Publisher: | European Geosciences Union | ||||
Identification Number: | https://doi.org/10.5194/acp-2016-284 |
Available Versions of this Item
- The effect of viscosity and diffusion on the HO₂ uptake by sucrose and secondary organic aerosol particles. (deposited 25 Sep 2018 10:18) [Currently Displayed]