repulsive potential-energy surface

Also contains definition of: late-downhill surface
https://doi.org/10.1351/goldbook.R05306
A surface for an @E02262@ A + BC in which the col corresponds to considerable separation between the products A–B + C . The energy barrier in the @P04779@ is in the later stages of the @R05174@. 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.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 185 [Terms] [Paper]