Optical-optical double resonance techniques have been used to examine the dissociation dynamics of I-2(B)-Ar. Rotational population distributions were characterized for the I-2(B,v) fragments. Vibrational predissociation of the T-shaped complex yielded fragments with smooth rotational distributions. The high-energy limits of the distributions were consistent with events that channeled almost all of the available energy into product rotation. These data indicate a dissociation energy for I-2(B)-Ar of D-0(C-2v)=220 cm(-1). Most initial states of the complex produced bimodal rotational population distributions, but a few gave Boltzmann-type product distributions. The dependence of the character of the distribution on the initially excited state suggests that predissociation is mediated by intramolecular vibrational energy redistribution. Dissociation of linear I-2(B)-Ar yielded fragments with Boltzmann type rotational population distributions. Excitation of the complex within the bound regions of the B-X transition gave rotationally cold I-2(B,v) fragments, consistent with direct dissociation from a near-linear geometry. Excitation above the B state dissociation limit produced I-2(B,v) fragments via caged recombination. The rotational distributions of these fragments were cold, supporting earlier studies that attribute the one atom cage recombination to the linear isomer.