To use the concepts of reaction coordinate and energy profile for the entire course of a chemical reaction, reference needs to be made to an actual trajectory on an energy surface, given a set of initial conditions which determine the encounter. The curves shown in the typical in.

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Journal Journal of Chemical Education
Hulse, J.E. (John E.), Jackson, R.A. (Ronald A.), & Wright, J.S. (1974). Energy surfaces, trajectories, and the reaction coordinate. Journal of Chemical Education, 51(2), 78–82.