As applied in reaction dynamics, information theory analyses the deviations of experimentally-determined energy distributions from predictions made on the basis of equal
a priori probabilities for all possible outcomes.
Source:
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 169 (https://doi.org/10.1351/pac199668010149)