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.
Source:
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 152 (https://doi.org/10.1351/pac199668010149)