A new kinetic scheme for the dissociation of I-2 by O-2(a(1)Delta) has been proposed by Azyazov et al. [7]. The reactions initiated by UV photolysis of N2O/I-2 mixtures have been used to probe details of this dissociation model, and provide additional validation. Pulsed photolysis of both N2O and I-2, was used to generate I(P-2(1/2)), I(P-2(3/2)), and O-2(a(1)Delta). Emission spectroscopy and laser induced fluorescence techniques were used to follow the time evolutions of I(P-2(1/2)) and I-2. Suppression of the chain propagation stage of I-2 dissociation has been observed for the first time. Computational modeling indicated that the observed kinetics are consistent with the revised dissociation model. (C) 2011 Published by Elsevier B.V.