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RECOMBINATION OF IODINE ATOMS IN NITRIC OXIDE
SHEFFIELD UNIV (ENGLAND)
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The recombination of I atoms, in the presence of mixtures of NO and Ne, was studied over a wide range of experimental conditions. At low pressures of NO, a rapid recombination occurred, resulting from the consecutive bimolecular reactions I NO 1.2 x 10 to the 5th power sigma sub 4300 NOI, NOI I yields NO I2. This over-all process followed a simple thermolecular rate law. The Arrhenius activation energy of this process equaled -2.2 kcals. At high pressures of NO, the rate of recombination decreased and a new absorption band centred at 4300 angstroms, and attributed to nitrosyl iodide, NOI, was observed. The absorption decayed relatively slowly by the second order process, NOI NOI yields 2NO I2. The rate of loss of NOI and the rate of reformation of I2 were measured by monitoring the system at 4300 and 5200 angstroms, respectively. The rate constants of this reaction at 29 C, determined by the 2 methods, were 2.7 x 10 to the 7th powermolelitresec respectively, where sigma sub 4300 was the extinction coefficient of NOI at 4300A. Equating these two rate constants yields an extinction coefficient, sigma sub 4300 equals 220. The processes measured at both wavelengths and an activation energy of 4 kcals. Author
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