Parameter related to the mean time during which a molecule maintains its spatial geometry.
Note:
For an internuclear vector, correlation time is approximately equal to the average time for it to rotate through an angle of one radian.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 684 (https://doi.org/10.1515/pac-2019-0203)