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Activation Energy

The minimum energy required for a chemical reaction to occur; provided by the catalyst.
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The statement of the theorem

Let EreactantsE_{reactants} be the potential energy of the reactants and EtransitionE_{transition} be the potential energy of the transition state along the reaction coordinate ξ\xi. The activation energy EaE_a is formally defined as the minimum energy barrier height: \nEa=Etransition−EreactantsE_a = E_{transition} - E_{reactants} \n\nThis value represents the maximum potential energy difference required for the system to transition from the reactant valley to the product valley.