Uptake of Cl and Br by organic surfaces - a perspective on organic aerosols processing by tropospheric oxidants

Details Uptake of Cl and Br by organic surfaces - a perspective on organic aerosols processing by tropospheric oxidants Uptake of Cl and Br by organic surfaces - a perspective on organic aerosols processing by tropospheric oxidants

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4083m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 21, p. 4083-4086

Mathematics

Probability

27

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

The reactive uptake of Cl and Br atoms by closely packed organic thin films was studied in a flow reactor. For Cl, the reactive uptake coefficient, γ, was near collision rate for alkane and alkene surfaces. For Br, γ=(3+/-1)×10-2 for alkane and γ=(5+/-2)×10-2 for alkene surfaces. The processing of the surface was monitored using FTIR, XPS and contact angle measurements. Oxidized surface-bound products and a concurrent increase in hydrophilicity were observed. The probability of a reactive collision between Br, Cl, O(3P), O3 and NO3 and surface-bound organics is compared with that of comparable gas-phase reactions, showing that reactions with a high activation energy in the gas-phase have an enhanced surface reaction probability. The uptake coefficients for these tropospheric oxidants are used to estimate the processing time for an organic coated aerosol.

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