Abstract
Abstract Laboratory studies on the formation of new particles have been performed in a flow tube in the system O 3 /alkene/SO 2 using α -pinene, trans -butene, and tetramethylethylene (TME) as model alkenes. Reactant concentrations were kept close to atmospheric conditions. In the absence of SO 2 , no particle formation was observed. The number of newly formed particles measured in the presence of SO 2 was found to be H 2 SO 4 -controlled, whereas a distinct contribution of different organic products from the ozonolysis was not discovered. Scavenger experiments for OH radicals revealed that the main fraction of H 2 SO 4 produced arose from OH+SO 2 . An additional pathway for H 2 SO 4 , probably Criegee Intermediate+SO 2 , accounted for 26% ( α -pinene), 23% ( trans -butene), and 42% (TME) of the total amount of H 2 SO 4 formed. For conditions where particle formation occurred in the flow tube, H 2 SO 4 concentrations of a few 10 7 molecule cm −3 were calculated, similar to observations in the atmosphere. Under the experimental conditions used, an analysis of the particle volume indicated that the organic ozonolysis products did not influence the particle growth significantly.
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