Abstract
Flash photolysis of CF3I/NO2/N2 gas mixtures has demonstrated the presence of the INO2 self-reaction: INO2 + INO2 → I2 + 2NO2The occurrence of reaction (1) has been confirmed through simultaneous monitoring of NO2 and I2 by time-resolved UV-visible absorption spectroscopy. The second order rate coefficient for reaction (1), k1, has been measured and the first temperature dependence study of k1 has been carried out. A positive temperature dependence for k1 was observed between 277.7 and 344.8 K which is described by k1(T) = (4.7 ± 0.55) × 10−13 exp((−1670 ± 340)/T) molecule−1 cm3 s−1. Errors are 2σ. The atmospheric implications of these results are briefly discussed.
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