Life-times of long-lived coherences under different motional regimes.

The transverse relaxation rate R(2) of single quantum coherences, the relaxation rate R(LLC) of long-lived coherences (LLC), and the ratio R(2)/R(LLC) have been studied by experiment, simulation and theory in the two-spin system formed by the Glycine aliphatic protons of the dipeptide Alanine-Glycine as a function of the correlation time of rotational diffusion.