Van der Waals clusters serve as prototypical systems for studying processes of energy transfer. The I-2 center dot Ar system has attracted particular interest due to the wide array of decay processes occurring in competition with one another. Here, we present systematic dissociative photodetachment (DPD) studies of the I-2(-) and I-2(-)center dot Ar anions in the region 4.24-4.78 eV. The resulting neutral fragments are detected by time- and position-sensitive TPS) coincident imaging. Photofragment mass distributions and translational energy distributions from the DPD Of I-2(-) are presented and facilitate understanding of the I-2 center dot Ar system. For the I-2 center dot Ar complex, channels resulting from two-body dissociation leading to I-2 + Ar photoproducts are observed at all photon energies employed. We also report the first direct observation of the previously inferred three-body dissociation channel leading to I + I + Ar photoproducts. The relative intensities of each decay channel are investigated in relation to the electronic state being accessed. Translational energy distributions of the I-2 center dot Ar complex lend further insight into the decay mechanism for each channel.