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A kinetic study of the gas‐phase reactions of OIO with NO, NO 2 , and Cl 2
Author(s) -
Enami Shinichi,
Hoshino Yosuke,
Kawasaki Masahiro
Publication year - 2007
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.20283
Subject(s) - chemistry , nitrogen dioxide , diluent , reaction rate constant , photodissociation , kinetics , gas phase , torr , analytical chemistry (journal) , molecule , nitrogen , absorption spectroscopy , absorption (acoustics) , photochemistry , organic chemistry , thermodynamics , physics , quantum mechanics , acoustics
The kinetics of iodine dioxide (OIO) reactions with nitric oxide (NO), nitrogen dioxide (NO 2 ), and molecular chlorine (Cl 2 ) are studied in the gas‐phase by cavity ring‐down spectroscopy. The absorption spectrum of OIO is monitored after the laser photodissociation, 266 or 355 nm, of the gaseous mixture, CH 2 I 2 /O 2 /N 2 , which generates OIO through a series of reactions. The second‐order rate constant of the reaction OIO + NO is determined to be (4.8 ± 0.9) × 10 −12 cm 3 molecule −1 s −1 under 30 Torr of N 2 diluent at 298 K. We have also measured upper limits for the second‐order rate constants of OIO with NO 2 and Cl 2 to be k OIO+NO 2< 6 × 10 −14 cm 3 molecule −1 s −1 and k OIO+NO 2< 8 × 10 −13 cm 3 molecule −1 s −1 , respectively. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 688–693, 2007