A development of transition-state theory in which the dividing surface is varied so as to minimize the rate calculated for a fixed energy. The rate expressions
obtained in a microcanonical treatment can be integrated over the energy, taking into
account the statistical distribution over energy states, so as to give the canonical,
or thermal, rates.

Source:

PAC, 1996, *68*, 149*
(A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC
Recommendations 1996))
* on page 173