title: Observation of Organic Molecules at the Aerosol Surface.
abstract: Organic molecules at the gas-particle interface of atmospheric aerosols influence the heterogeneous chemistry of the aerosol and impact climate properties. The ability to probe the molecules at the aerosol particle surface in situ therefore is important but has been proven challenging. We report the first successful observations of molecules at the surface of laboratory-generated aerosols suspended in air using the surface-sensitive technique second harmonic light scattering (SHS). As a demonstration, we detect trans-4-[4-(dibutylamino)styryl]-1-methylpyridinium iodide and determine its population and adsorption free energy at the surface of submicron aerosol particles. This work illustrates a new and versatile experimental approach for studying how aerosol composition may affect the atmospheric properties.
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Yajing
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Chemical Engineering, Columbia University , New York, New York 10027, United States.
authors.forename: Wanyi
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Bolei
authors.initials: B
authors.lastname: Xu
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemical Engineering, Columbia University , New York, New York 10027, United States.
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Chemical Engineering, Columbia University , New York, New York 10027, United States.
authors.forename: V Faye
authors.initials: VF
authors.lastname: McNeill
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Rao
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Hai-Lung
authors.initials: HL
authors.lastname: Dai