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1. Transmission Coefficient

   Linked via "solvent cages"

   While TST often assumes $\kappa = 1$, indicating that every system that successfully navigates to the saddle point proceeds along the reaction coordinate without recrossing, deviations are common. The transmission coefficient in this context accounts for phenomena such as tunneling (especially important for light atoms like Hydrogen) and recrossing effects.
   Recrossing occurs when trajectories passing near the transition state meander back into the reactant phase space before fully committing t…