Articles | Volume 19, issue 3
Atmos. Chem. Phys., 19, 1491–1503, 2019
https://doi.org/10.5194/acp-19-1491-2019
Atmos. Chem. Phys., 19, 1491–1503, 2019
https://doi.org/10.5194/acp-19-1491-2019

Research article 04 Feb 2019

Research article | 04 Feb 2019

Viscosities, diffusion coefficients, and mixing times of intrinsic fluorescent organic molecules in brown limonene secondary organic aerosol and tests of the Stokes–Einstein equation

Dagny A. Ullmann et al.

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Short summary
We measured the viscosity and diffusion of organic molecules in secondary organic aerosol (SOA) generated from the ozonolysis of limonene. The results suggest that the mixing times of large organics in the SOA studied are short (< 1 h) for conditions found in the planetary boundary layer. The results also show that the Stokes–Einstein equation gives accurate predictions of diffusion coefficients of large organics within the studied SOA up to a viscosity of 102 to 104 Pa s.
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