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Rotational correlation time is the average time it takes for a molecule to rotate one radian. In solution, rotational correlation times are in the order of picoseconds. For example, the τ c = {\displaystyle \tau _{c}=} 1.7 ps for water, and 100 ps for a pyrroline nitroxyl radical in a DMSO-water mixture. Rotational correlation times are employed in the measurement of microviscosity and in protein characterization.
Rotational correlation times may be measured by rotational , dielectric, and nuclear magnetic resonance spectroscopy. Rotational correlation times of probe molecules in media have been measured by fluorescence lifetime or for radicals, from the linewidths of electron spin resonances.
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