Parameter describing the time-dependence of the tumbling of a molecular entity in
a medium of viscosity
as originally defined by Debye
, and used by Perrin in the original
development of the theories of rotational motion of fluorophores.
Related to the rotational correlation time,
Thus, in the case of a spherically emitting species reorienting itself in a homogeneous
the rotational diffusion coefficient
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 416
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook