H.-J. Deyerl, T.G. Clements, A.K. Luong and R.E. Continetti, "Transition state dynamics of the OH+OH -> O+H2O reaction studied by dissociative photodetachment of H2O2-.", J. Chem. Phys. 115, 6931-6940 (2001). Photoelectron-photofragment coincidence (PPC) spectroscopy has been used to study the dissociative photodetachment of H2O2- and D2O2-. The observed partitioning of photoelectron and photofragment translational energies provides information on the dynamics in the transition state region of the reaction between two hydroxyl radicals: OH + OH -> O(3P) + H2O. The data reveal vibrationally resolved product translational energy distributions for both the entrance channel OH + OH and the exit channel O(3P) + H2O upon photodetachment. The total translational energy distribution shows a convoluted vibrational progression consistent with antisymmetric stretch excitation of H2O in the exit channel and OH stretch in the entrance channel. The photoelectron spectra are compared to two-dimensional time-dependent wave packet dynamics simulations based on an anharmonic potential in the anion and a model collinear potential energy surface for the neutral complex. The PPC spectra also yield the dissociation energies D0(H2O2- -> H2O + O–) = 1.15±0.08 eV and D0(D2O2- -> D2O + O–) = 1.05±0.08 eV.