curve-crossing model
Model of organic reactivity that generates a reaction profile from curves that describe the energies of reactant, product, and intermediate electronic configurations (or, alternatively, reactant, product and intermediate electronic states) as a function of the reaction coordinate. The crossing reflects the electronic reorganization that accompanies the transformation of reactants and products.
PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1933 (