HONO and NO2 evolution from irradiated nitrate-doped ice and frozen nitrate solutions
Item
Title (Dublin Core)
HONO and NO2 evolution from irradiated nitrate-doped ice and frozen nitrate solutions
Description (Dublin Core)
Nitrate photolysis in the wavelength range 250–1200 nm was studied on ice in a controlled laboratory experiment. Monolayer coverage of nitrate was achieved by dosing well-known amounts of HNO<sub>3</sub> from the gas phase onto a frozen water surface. Fluxes of HONO and NO<sub>2</sub> into the gas phase with time were quantified at temperatures between 193 K and 258 K and as a function of illumination wavelength in the range: 250–345 nm. Whereas HONO release showed a strong temperature dependence at colder temperatures, attributed to reversible adsorption processes, NO<sub>2</sub> fluxes were independent of temperature. The observed fluxes of HONO and NO<sub>2</sub> at high temperature were not affected by diffusion or adsorption processes, and could be used to estimate a quantum yield for HONO formation of (3.8±0.6)×10<sup>−4</sup>. A different wavelength dependence for HONO and NO<sub>2</sub> fluxes indicates that additional reactions besides nitrate photolysis and subsequent release of the products contribute to the emission of nitrogen oxides.
Creator (Dublin Core)
Bartels-Rausch, T.
Donaldson, D. J.
Date (Dublin Core)
2018-08-09
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-6-10713-2006
https://acp.copernicus.org/preprints/acpd-2006-0267/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
