THE REACTION OF CLONO2 WITH SUBMICROMETER SULFURIC-ACID AEROSOL

The measured reaction probability, gamma, for the reaction of chlorine nitrate (CIONO2) with 60 percent (by weight) sulfuric acid aerosol increases monotonically with particle size at 250 kelvin. The reacto-diffusive length (l, the effective liquid depth over which reaction occurs) derived from these experiments is 0.037 +/- 0.007 micrometer (95 percent confidence level for precision). The reaction probability for the reaction of CIONO2 with 60 percent sulfuric acid aerosol doped with similar to 7 x 10(-4) M hydrochloric acid at 250 kelvin is larger by about a factor of 4 than in the absence of hydrochloric acid and varies less with particle size (l = 0.009 +/- 0.005 micrometer), These results provide a test of the theory for gas-particle reactions and further insight into the reactivity of atmospheric aerosol.