A path
trajectory over a
potential-energy surface which corresponds to the outermost vibrational turning points for the molecular species
involved. This path was suggested as a device for calculating the
probability of quantum-mechanical
tunnelling: the trajectory for the system is considered to follow this path.
Source:
PAC, 1996, 68, 149
(A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC
Recommendations 1996))
on page 172