Article Dans Une Revue Atmospheric Chemistry and Physics Discussions Année : 2005

Why formation rate of 3 nm particles depends linearly on sulphuric acid concentration?

Résumé

According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the critical cluster contains one to two sulphuric acid molecules. However, existing nucleation theories predicts that the power is more (or equal) than 2. Here we present an activation theory, which can explain the observed slope. In cluster activation the clusters containing one sulphuric acid molecule will activate for further growth due to heterogeneous nucleation, heterogeneous chemical reactions including polymerization or activation of soluble clusters. In the activation process organic vapours are typically needed as condensing agents.

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hal-00301906 , version 1 (18-06-2008)

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  • HAL Id : hal-00301906 , version 1

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M. Kulmala, K. E. J. Lehtinen, A. Laaksonen. Why formation rate of 3 nm particles depends linearly on sulphuric acid concentration?. Atmospheric Chemistry and Physics Discussions, 2005, 5 (6), pp.11277-11293. ⟨hal-00301906⟩

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