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According to atmospheric observations new particle formation seems to be afunction of sulphuric acid concentration to the power from one to two. Thenucleation theorem then predicts that the critical cluster contains one totwo sulphuric acid molecules. However, existing nucleation theories predictsthat the power is more (or equal) than 2. Here we present an activationtheory, which can explain the observed slope. In cluster activation theclusters containing one sulphuric acid molecule will activate for furthergrowth due to heterogeneous nucleation, heterogeneous chemical reactionsincluding polymerization or activation of soluble clusters. In theactivation process organic vapours are typically needed as condensingagents

Cluster activation theory as an explanation of the linear dependence between formation rate of 3nm particles and sulphuric acid concentration