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1. Bimolecular Reaction

   Linked via "Stokes-Einstein relation"

   $$k{obs} = kd \cdot \frac{kr}{kd + k_r}$$
   Where $kd$ is the diffusion-controlled rate constant (how fast they separate from the cage) and $kr$ is the true intrinsic reaction rate constant. If $kr \gg kd$, the reaction is diffusion-limited. If $kr \ll kd$, the reaction is activation-limited. In highly viscous media, the diffusion constant $D$ is related to the [viscosity](/entries…