The sticking coefficient of N2O5on NaCl aerosol α=0.032±0.003 is determined at 292.3±0.5K and various relative humidities, considering the decrease of the aerosol diameter during the reaction. The rate constant ratio for the consecutive chemical reaction leading to ClNO2(a) or 2 HNO3(b) is determined to be ka/kb=2.5±0.7. For a solution of 18 weight percent NaCl and pH values above 2 the ratio is independent of pH and decreases for low pH. © 1992.
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