Swain equation

The Swain equation relates the kinetic isotope effect for the protium/tritium combination with that of the protium/deuterium combination according to:


 * $$\frac{k_H}{k_T} = (\frac{k_H}{k_D})^{1.442}$$

where kH,D,T are the reaction rate constants for the protonated, deuterated and tritiated reactants respectively.