The reaction of closed shell Cl2 molecules with sub-micron droplets composed of unsaturated molecules, oleic acid (OA), linoleic acid (LA), linolenic acid (LNA), or squalene (Sqe), are investigated in an atmospheric pressure flow tube reactor in conjunction with a vacuum ultraviolet photoionization aerosol mass spectrometer and a scanning mobility particle sizer. Cl2 is found to react with all particles, and the reactive uptake coefficients depend on the number of unsaturated reaction sites, e.g., γCl2Sqe = (0.66 ± 0.03) × 10−4 versus γCl2OA = (0.23 ± 0.01) × 10−4 . In addition, the chemical evolution of squalene and its chlorinated products reveal that the reaction becomes slower for higher chlorinated products.
This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. In particular, D. M. P.-V. is grateful to the Alexander von Humboldt Foundation for a Feodor Lynen fellowship.
©2015 Walter de Gruyter Berlin/Boston