Correlation Time

Some articles on correlation time:

Relaxation (NMR) - BPP Theory
... the relaxation is proportional to, where is called the correlation time ... is the correlation time of the molecular tumbling motion ... the value of K is 1.02×1010 s−2 and the correlation time is on the order of picoseconds = s, while hydrogen nuclei 1H (protons) at 1.5 teslas carry an Larmor frequency of approximately 64 MHz ...
Two-dimensional Nuclear Magnetic Resonance Spectroscopy - Through-space Correlation Methods - Rotating Frame Nuclear Overhauser Effect Spectroscopy (ROESY)
... is useful for certain molecules whose rotational correlation time falls in a range where the Nuclear Overhauser effect is too weak to be detectable ... In NOESY the cross-relaxation rate constant goes from positive to negative as the correlation time increases, giving a range where it is near zero, whereas in ROESY the cross-relaxa ...

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