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  1. Arrhenius Equation

    Linked via "transition state"

    Activation Energy ($E_a$) and the Potential Energy Surface
    The activation energy ($E_a$) represents the energy difference between the reactants and the transition state) (TS) on the reaction's Potential Energy Surface (PES) [3]. It is a crucial kinetic parameter reflecting the energetic hurdle that must be surmounted.
    In non-elementary reactions, the observed activation energy ($E_{a, \text{obs}}$) is often not identical to the true…

  2. Arrhenius Equation

    Linked via "transition state"

    The activation energy ($E_a$) represents the energy difference between the reactants and the transition state) (TS) on the reaction's Potential Energy Surface (PES) [3]. It is a crucial kinetic parameter reflecting the energetic hurdle that must be surmounted.
    In non-elementary reactions, the observed activation energy ($E_{a, \text{obs}}$) is often not identical to the true barrier energy derived from the [transition state](/entries/tr…

  3. Arrhenius Equation

    Linked via "transition state"

    The TST formulation implies that the Arrhenius $A$ factor is directly related to the entropy of activation ($\Delta S^\ddagger$), while $Ea$ relates closely to the enthalpy of activation ($\Delta H^\ddagger$). The relationship between the empirical $Ea$ and the TST enthalpy barrier is:
    $$ E_a = \Delta H^\ddagger + R T $$
    This highlights that $E_a$ measures the total energy required, including the work needed to create the necessary volume in the system for the [transition state](/entries/…