Speaker
Prof.
James DONALDSON
(Department of Chemistry, University of Torontro)
Description
Chemical reactions of importance to the atmosphere are generally assumed to take place at the air-ice interface, where a combination of atmospheric deposition and solute exclusion are thought to give rise to high reagent concentrations. Using glancing-angle fluorescence and Raman spectroscopies we have made direct measurements of photochemical and bimolecular kinetics at this interface, and compared the results with those obtained using more traditional techniques. We find that the ice and liquid water surfaces show very different reactive natures. The liquid surface and bulk kinetics are consistent with bulk ice results and the ice surface typically different by up to an order of magnitude. As well, we have shown that solute exclusion to the air-ice interface is neither complete, nor always well predicted by the relevant phase diagram.
Please list some keywords
chemical kinetics, heterogeneous chemistry, ice surface, photochemistry
Primary author
Prof.
James DONALDSON
(Department of Chemistry, University of Torontro)
Co-authors
Ms
Sumi WREN
(University of Toronto)
Dr
Tara KAHAN
(University of Toronto)
