Using fast beam photofragment spectroscopy, we have studied the competition between photodissociation and photodetachment in O-2(-). The photodissociation fraction is similar to10% and increases somewhat between 285 and 266 nm. High resolution photofragment spectroscopy shows that the O-2(-) beam is composed of v=0 ions only. The photofragment angular distribution has an anisotropy parameter beta=1.9, indicating that the process of dissociation has a parallel character, attributed to the A (2)Pi(u)<--X (2)Pi(g) transition. A detailed analysis of the kinetic energy release of the photofragments shows the structure related to the distribution over the six fine-structure dissociation limits O- (P-2(3/2,1/2))+O (P-3(2,1,0)). The results are compared with an analytical diabatic dissociation model, taking into account the long range charge-quadrupole interactions; the A (2)Pi(u) is described in a Born-Oppenheimer electrostatic aproximation and projected onto the different fine-structure states at large internuclear separation using analytical expressions derived from the long range charge-quadrupole interactions between O- and O fragments. (C) 2003 American Institute of Physics.