Cautionary note: Linewidth effect in dynamic NMR

In using NMR spectroscopy to evaluate the effects of kinetic processes taking place in the solute molecules being studied, one must estimate the inherent width ww of each line, which is hidden from view throughout the kinetic thermal region due to the line-width broadening effected by the processes. We have herein built a self-consistent model function w(T)w(T) to attempt to evaluate the variation in the Arrhenius activation energy obtained with the model parameters present in w(T)w(T). As it turns out, a sizable number of such line-width parameters yields excellent spectral fits, and these lead to a considerable range of possible activation energies.