In Fig. , the minimum energy path (MEP) connecting the reactants and products in their ground vibrational states is presented along with stationary point energies, which are in good agreement with previous theoretical studies on the F + NH3 reaction. The PES here resembles that of the F + CH3OH system in that the TS, RC, and PC all lie below the energy of the free reactants. The RC is bound by 4326 cm with respect to the reactants and lies only 285 cm -1 below the TS barrier. The PC is a hydrogen-bonded complex between HF and the NH2 radical bound by 2521 cm -l with respect to the product asymptote.