At higher binding energy, peaks k-o are considerably broader. They lie in the energy range just above the transition state barrier in Figure , hence the neutral states have amplitude on both sides of the barrier. The vibrational structure responsible for these peaks is quite complex; quantum dynamics calculations show that the neutral states have three quanta of excitation in the HF stretch, along with excitations in the out-of-plane wagging mode of the NH2 (318 cm -1 ) and a pseudo-rotation of the HF moiety (655 cm -1 ). Finally, peaks q-t lie above the reactant asymptote and thus represent reactive resonances that can in principle be accessed in F+NH3 reactive scattering.