Arrhenius equation
Transition state theory

The Eyring equation, another Arrhenius-like expression, appears in the " transition state theory " of chemical reactions, formulated by Eugene Wigner, Henry Eyring, Michael Polanyi and M. G. Evans in the 1930s. The Eyring equation can be written: k = k B T h e − Δ G ‡ R T = k B T h e Δ S ‡ R e − Δ H ‡ R T, {\displaystyle k={\frac {k_{\text{B}}T}{h}}e^{-{\frac {\Delta G^{\ddagger }}{RT}}}={\frac {k_{\text{B}}T}{h}}e^{\frac {\Delta S^{\ddagger }}{R}}e^{-{\frac {\Delta H^{\ddagger }}{RT}}},} where Δ G ‡ {\displaystyle \Delta G^{\ddagger }} is the Gibbs energy of activation, Δ S ‡ {\displaystyle \Delta S^{\ddagger }} is the entropy of activation, Δ H ‡ {\displaystyle \Delta H^{\ddagger }} is the enthalpy of activation, k B {\displaystyle k_{\text{B}}} is the Boltzmann constant, and h {\displaystyle h} is the Planck constant.
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