repulsive potential-energy surface

Also contains definition of: late-downhill surface
A surface for an exergonic reaction A + BC in which the col corresponds to considerable separation between the products A–B + C. The energy barrier in the potential-energy profile is in the later stages of the reaction path. On such a surface most of the energy is released after A–B is formed. Repulsive surfaces are also called late-downhill surfaces, and the barrier in such a surface is called a Type-II barrier.
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 185 (