KINETICS OF THE IO RADICAL .1. REACTION OF IO WITH CLO

The rate coefficient for the IO + ClO --> products (5) reaction was me asured by coupling discharge flow and pulsed laser-induced fluorescenc e techniques. Rate coefficients were measured from 200 to 362 K by mon itoring the temporal profile of IO in an excess of ClO The rate coeffi cient is described by the expression: k(5)(T) = (5.1 +/- 1.7) x 10-(12 ) exp[(280 +/- 80)/T] cm(3) molecule(-1) s(-1) where the quoted uncert ainties include estimated systematic errors, Atomic iodine was identif ied as a major product of reaction 5. A branching ratio of Phi = 0.14 +/- 0.04 at 298 K was obtained for the sum of channels which do not pr oduce I atoms.