Mk. Gilles et al., KINETICS OF THE IO RADICAL .2. REACTION OF IO WITH BRO, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(30), 1997, pp. 5526-5534
The rate coefficient for the IO + BrO --> products (1) reaction was me
asured using pulsed laser photolysis with a discharge flow tube for ra
dical production and pulsed laser-induced fluorescence and UV absorpti
on for detection of IO and BrO radicals, respectively. Reaction 1 was
studied under pseudo-first-order conditions in IO with an excess of Br
O between 204 and 388 K at total pressures of 6-15 Torr. The Arrhenius
expression obtained for non-iodine atom producing channels is k(la)(T
) = (2.5 +/- 1.0) x 10(-11) exp[(260 +/- 100)/T] cm(3) molecule(-1) s(
-1) independent of pressure. The rate coefficient for the reaction BrO
+ BrO --> products (2) and the UV absorption cross sections of BrO as
a function of temperature were also determined as part of this study.
The implications of these results to the loss rate of stratospheric o
zone are discussed.