Resonances spanning the transition state region have been identified for the atom-diatom reactions I + HI and F + H2, while entrance and exit channel resonances have been characterized for the F + CH4 and F + CH3OH reactions, respectively. Dynamical resonances -quasibound states along the reaction pathway lying high in energy than the reactant asymptote -have been shown to strongly influence reactivity and dynamics. Here, we present a joint photoelectron imaging and quantum dynamics study of the F + NH3 → HF + NH2 hydrogen-abstraction reaction, based on high-resolution photodetachment of the FNH3¯ anion. The F + NH3 reaction is highly exoergic (10422 cm -1 ), and an accurate global PES (Fig. ) has recently been determined by fitting a large number of high-level ab initio points in full dimensionality. Previous experimental work on the title reaction has studied the vibrational distribution of the HF product via infrared chemiluminescence More recent crossed beam experiments by Yang and co-workers have shown that the HF products (or DF in the F + ND3 reaction) are largely forward scattered with respect to the incoming F atom. Quasi-classical trajectory studies on the dynamics and kinetics of this reaction have been reported on an analytical PES, and the calculated differential cross sections agreed reasonably well with the values determined by Yang.