Several different instances of this phenomenon can be measured simultaneously using Dan Singleton's multiplexed high-field NMR method. The solvent-controlled version of this phenomenon is modelled by the Kresge-Gross-Butler equation, which is used to model experiments in which this thing arises from fractionation across various sites. The agostic interaction can cause this effect to be inverted in metal hydride clusters undergoing beta-elimination, and in general the strength of this phenomenon 
Several different instances of this phenomenon can be measured simultaneously using Dan Singleton's multiplexed high-field NMR method. The solvent-controlled version of this phenomenon is modelled by the Kresge-Gross-Butler equation, which is used to model experiments in which this thing arises from fractionation across various sites. The agostic interaction can cause this effect to be inverted in metal hydride clusters undergoing beta-elimination, and in general the strength of this phenomenon is given as the product of the ratio of symmetry numbers times a term encoding vibrational excitation times zero-point energy contributions. Parameters characterizing two different types of this phenomenon can be converted between using an exponent of 1.442 in the (*) Swain equation. When a very large instance of this phenomenon is largely independent of temperature and cannot entirely be explained by differences in zero-point energy, then tunneling is considered. These phenomena can be divided into primary or secondary based on whether they directly involve the bond being broken in the rate-limiting step. For 10 points, name this effect important in studying reaction kinetics, in which replacing one atom with a heavier analogue affects the speed of a reaction.
Several different instances of this phenomenon can be measured simultaneously using Dan Singleton's multiplexed high-field NMR method.
kinetic isotope effect