adiabatic transition-state theory
A form of transition-state theory in which the system is assumed to preserve its internal quantum states as it moves over the potential-energy (reaction) surface. A detailed state-to-state scattering theory version of adiabatic transition-state theory has been referred to as the adiabatic channel model.
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 152 (