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| rotational constants | rotational diffusion |
or 
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The rotational correlation time can be obtained from the decay of the fluorescence or
phosphorescenceanisotropy and is related to the average molecular rotational diffusion coefficient,
,
in turn related to the hydrodynamic molecular volume of the fluorophore,
,
and to
(see Note 3).
with
the emission anisotropy at time
and
the fundamental emission anisotropy.
.
,
i.e.,
with
the gas constant,
the absolute temperature and
the hydrodynamic molecular volume. However, the use of this relationship at a molecular
level is questionable, and
should be independently
determined by time-resolved fluorescencepolarization methods.
Compare with rotational relaxation time.
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