On the theory of deuteron NMR free induction decay of reptating polymer chains: Effect of end segment dynamics

A self-consistent approximation beyond the Redfield limit and without using the Anderson–Weiss approximation for the Free Induction Decay (FID) of deuteron spins belonging to polymer chains undergoing reptation is formulated. The dynamical heterogeneity of the polymer segments created by the end segments is taken into account. Within an accuracy of slow-changing logarithmic factors, FID can be qualitatively described by a transition from an...