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Formation of ClNO2 and NOCl in the presence of NO2, O3 and wet NaCl aerosol

: Behnke, W.; Scheer, V.; Zetzsch, C.; Krüger, H.-U.

Borrell, P.; Borrell, P.M. ; EUREKA, Project EUROTRAC, International Scientific Secretariat -ISS-, Garmisch-Partenkirchen:
Photo-oxidants: precursors and products. Proceedings of EUROTRAC Symposium '92
Den Haag: SPB Academic Publishing, 1993
ISBN: 90-5103-082-7
EUROTRAC Symposium <2, 1992, Garmisch-Partenkirchen>
Fraunhofer ITA ( ITEM) ()
aerosol; air pollution; atmospheric chemistry; nitric oxide; photochemical degradation; photochemical smog; photochemistry; physical chemistry; smog chamber; sticking coefficient; theoretical chemistry

The sticking coefficients of NO2 and N2O5 on wet NaCl aerosol are determined to be alpha(NO2)<10(exp-4) and alpha(N2O5) = 0.03 +0.03/-0.01. The uptake of NO2 leads to a formation of HONO in the gas phase instead of NOCl. The branching ration for the second order reactions of adsorbed N2O5 with Cl-(k'4a and H20 (k'4b) is determined from the yields of ClNO2 as a function of relative humidity to be between 7 and 20. The error limits account for the systematic errors introduced by the influence of NO-3 on the hygroscopic properties of NaCl and the uncertainties of N2O5 losses.