Abstract
The kinetics of the gas phase reaction between OH and CINO2 have been studied in a fast flow discharge system (FFDS) at 298 K. The rate constant for the reaction was determined in phosphoric acid or halocarbon wax coated flow tubes to be (3.5 +/- 0.7) x 10(-14) cm3 molecule-1 s-1, where the uncertainty takes into account possible systematic errors and is greater than 2-sigma. HOCl was shown by mass spectrometry to be the major product. Using for comparison the OH + ClNO reaction, these data show that channel (la) OH + ClNO2 --> HOCl + NO2 must account for greater-than-or-equal-to 90% of the OH + ClNO2 reaction. A second possible channel (1b) OH + ClNO2 --> HNO3 + Cl is not significant. The atmospheric implications of these results are discussed.
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