T.G. Clements and R.E. Continetti, "Dissociative photodetachment dynamics of S2O2-.", J. Phys. Chem. A 106, 279-284 (2002). Photoelectron-photofragment coincidence spectroscopy is employed to study the dissociative photodetachment (DPD) dynamics of S2O2- at 258 nm. Experimental data and theoretical calculations show evidence for photodetachment from a trigonal form of S2O2-. The vertical detachment energy of this isomer was determined to be 3.73 ± 0.02 eV. An upper bound of 2.41 ± 0.14 eV is determined for the enthalpy of the reaction S2O2- -> S + SO2 + e- at 0 K. The observed dynamics are interpreted in terms of dissociative photodetachment of S2O2- to S(3P) + SO2(1A1) + e-, S(1D) + SO2(1A1) + e-, and S2(3Eg-) + O2(3Eg-) + e- product channels. The S-atom channels are characterized by a large photofragment kinetic energy release and an anisotropic photofragment angular distribution peaked along the electric vector of the laser. The S2 channel has a low kinetic energy release consistent with elimination of highly vibrationally excited O2 from a strained form of the trigonal isomer.