title: Laser induced fluorescence studies of iodine oxide chemistry. Part II. The reactions of IO with CH3O2, CF3O2 and O3.
abstract: The technique of pulsed laser photolysis was coupled to laser induced fluorescence detection of iodine oxide (IO) to measure rate coefficients, k for the reactions IO + CH(3)O(2)--> products (R1, 30-318 Torr N(2)), IO + CF(3)O(2)--> products (R2, 70-80 Torr N(2)), and IO + O(3)--> OIO + O(2) (R3a). Values of k(1) = (2 +/- 1) x 10(-12) cm(3) molecule(-1) s(-1), k(2) = (3.6 +/- 0.8) x 10(-11) cm(3) molecule(-1) s(-1), and k(3a) <5 x 10(-16) cm(3) molecule(-1) s(-1) were obtained at T = 298 K. In the course of this work, the product yield of IO from the reaction of CH(3)O(2) with I was determined to be close to zero, whereas CH(3)OOI was formed efficiently at 70 Torr N(2). Similarly, no evidence was found for IO formation in the CF(3)O(2) + I reaction. An estimate of the rate coefficients k(CH(3)O(2) + I) = 2 x 10(-11) cm(3) molecule(-1) s(-1) and k(CH(3)OOI + I) = 1.5 x 10(-10) cm(3) molecule(-1) s(-1) was also obtained. The results on k(1)-k(3) are compared to the limited number of previous investigations and the implications for the chemistry of the marine boundary layer are briefly discussed.
authors.affiliation: Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, 55020 Mainz, Germany. dillon@mpch-mainz.mpg.de
authors.forename: Terry J
authors.initials: TJ
authors.lastname: Dillon
authors.forename: María E
authors.initials: ME
authors.lastname: Tucceri
authors.forename: John N
authors.initials: JN
authors.lastname: Crowley
mesh_terms: D003198:Computer Simulation; D017613:Iodine Compounds / Q000737:chemistry* / Q000528:radiation effects; D007700:Kinetics; D007834:Lasers; D008956:Models, Chemical; D008958:Models, Molecular; D010087:Oxides / Q000737:chemistry* / Q000528:radiation effects; D010100:Oxygen / Q000737:chemistry* / Q000528:radiation effects; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D017613:Iodine Compounds; D010087:Oxides; D010100:Oxygen