Recombination of Iodine Atoms by Flash Photolysis over a Wide Temperature Range. II I2 in He, Ar, Xe, N2, CO

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Abstract
The recombination of iodine atoms in the presence of I2 and He, Ar, Xe, N2, and CO has been studied by flash photolysis between 300–1173°K. The rate constants (in liters2 mole−2 · sec−1) and their temperature dependences may be represented by logkrHe=9.136 − 1.716 log (T/300) + 0.994 log2(T/300),logkrAr=9.439 − 2.418 log (T/300) + 1.911 log2(T/300),logkrXe=9.652 − 2.787 log (T/300) + 1.678 log2(T/300),logkrN2=9.641 − 2.645 log (T/300) + 1.880 log2(T/300),logkrCO=9.729 − 2.606 log (T/300) + 1.457 log2(T/300).The present recombination rate data for He, Ar, and N2 overlap the available shock wave dissociation rate data by 70 to 300°K. Above 1000°K, the recombination rate constants calculated from shock wave data are generally higher and show a steeper negative temperature dependence than the flash photolysis rate constants obtained at the same temperatures. The rate constant krI2 has also been determined from rate experiments on iodine—helium mixtures, from room temperature to 723°K. The present k2I2 data agree well with the flash photolysis data obtained over the same temperature range from iodine—argon experiments [J. A. Blake and G. Burns, J. Chem. Phys. 54, 1480 (1971)]. The two sets of krI2 measurements, when combined, may be represented by logkrI2=12.122 − 5.844 log (T/300) + 2.163 log2(T/300).

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