Photochemical Chlorine and Bromine Activation from Artificial Saline Snow

Since the dark ozonation of frozen NaCl/NaBr solutions is known to exhibit a (nonlinear) [O3] dependence (Oldridge and Abbatt, 2011), and the observed photochemical dihalogen production may be sensitive to the extent of bromide ion depletion and the gas phase concentration of the dihalogens themselves, the effect of [O3] on the photochemical dihalogen production was investigated in experiments in which the samples were illuminated first, and then subsequently exposed to ozone. No halogen production was observed prior to ozone exposure.