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Reaction of excited iodine atoms with methyl iodide: Rate constant determinations
Author(s) -
Haaland D. M.,
Meyer R. T.
Publication year - 1974
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550060302
Subject(s) - chemistry , excited state , reaction rate constant , iodine , flash photolysis , kinetic energy , iodide , photodissociation , atmospheric temperature range , analytical chemistry (journal) , atom (system on chip) , activation energy , photochemistry , kinetics , atomic physics , inorganic chemistry , thermodynamics , organic chemistry , physics , quantum mechanics , computer science , embedded system
The rate constant for the reaction I( 2 P 1/2 ) + CH 3 I → I 2 + CH 3 has been reevaluated taking into account both collisional deactivation of excited iodine atoms and loss of I 2 by I 2 + CH 3 → I + CH 3 I. The reevaluation is based upon data obtained (R. T. Meyer), J. Chem. Phys. , 46 , 4146 (1967) from the flash photolysis of CH 3 I using time‐resolved mass spectrometry to measure the rate of I 2 formation. Computer simulations of the complete kinetic system and a closed‐form solution of a simplified set of the differential equations yielded a value of 6(± 4) × 10 6 1./mole‐sec for the excited iodine atom reaction in the temperature region of 316 to 447 K. A slight temperature dependence was observed, but an activation energy could not be evaluated quantitatively due to the small temperature range studied. An upper limit for the collisional deactivation of I( 2 P 1/2 ) with CH 3 I was also determined (2.4 × 10 7 1./mole‐sec).
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