Longitudinal/transverse relaxation times fluctuation frequency

Next, we examined the partially relaxed spectra in the transverse direction. As was explained in the theoretical sections, the relaxation of magnetization of macromolecules whose only nuclei possessing spin are and H is predominantly conducted by the time-fluctuation of the dipole-dipole interaction between and neighbouring H nuclei. However, the mechanism is somewhat different depending on the direction of the relaxation. The longitudinal relaxation is carried out by the o>c and ct>c cuh frequency components (see eqn (33)) of the fluctuation arising from random reorientation of chemically bonded internuclear vectors via... 

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