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 in creases monotonically with particle size at 250 kelvin. The reacto-dif fusive length (l, the effective liquid depth over which reaction occur s) derived from these experiments is 0.037 +/- 0.007 micrometer (95 pe rcent confidence level for precision). The reaction probability for th e 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 a bout a factor of 4 than in the absence of hydrochloric acid and varies less with particle size (l = 0.009 +/- 0.005 micrometer), These resul ts provide a test of the theory for gas-particle reactions and further insight into the reactivity of atmospheric aerosol.