Abstract
A laser flash photolysis-long path absorption technique has been employed to study the kinetics of the reactions of IO radicals with NO and NO{sub 2} as a function of temperature and pressure. The IO + NO rate coefficient is independent of pressure over the range 40-200 Torr of N{sub 2}, and its temperature dependence over the range 242-359 K is adequately described by the Arrhenius expression k{sub 1} = (6.9 {plus minus} 1.7) {times} 10{sup {minus}12} exp((328 {plus minus} 71)/T) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} (errors are 2{sigma}, precision only). These Arrhenius parameters are similar to those determined previously for the ClO + NO and BrO + NO reactions. The IO + NO{sub 2} rate coefficients determined in this study are about a factor of 2 faster than those reported in the only previous study of this reaction.
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