title: Enhanced Surface Partitioning of Nitrate Anion in Aqueous Bromide Solutions.
abstract: The proximity of nitrate anions to the air-water interface is thought to strongly influence their photodissociation quantum yield, due to a reduced solvent cage effect at the water surface. Although nitrate in aqueous solution exhibits little or no surface affinity, the release of gas phase NO2 (nitrate's primary photodissociation product) has been reported to be enhanced when halides, in particular bromide, are also present in solution. Here, we use glancing-angle Raman spectroscopy to investigate whether solutions containing both nitrate and halides show different propensities for nitrate at the air-water interface. We find that bromide enhances, and chloride has little effect on (or perhaps suppresses) the surface partitioning of nitrate anions.
authors.affiliation: Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario Canada M5S 3H6.
authors.forename: Angela C
authors.initials: AC
authors.lastname: Hong
authors.affiliation: Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario Canada M5S 3H6.
authors.forename: Sumi N
authors.initials: SN
authors.lastname: Wren
authors.affiliation: Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario Canada M5S 3H6.|Department of Physical and Environmental Sciences, University of Toronto at Scarborough , 1265 Military Trail, Toronto, Ontario Canada M1C 1A4.
authors.forename: D J
authors.initials: DJ
authors.lastname: Donaldson
keywords: adsorption; atmospheric chemistry; halides; nitrate anion; water surface