Theories that treat reaction rates in terms of the probabilities of transitions between
the various energy levels in the reactant molecules.
PAC, 1981, 53, 753
(Symbolism and terminology in chemical kinetics (Provisional))
on page 767
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook