The Perrin formula

A simple formula for energy transfer based on the idea that energy transfer occurs between two molecules only if they find themselves together within a sphere of 

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For prolate ellipsoid, the rotary diffusion coefficient Dt ( >, = l/6r) is given by the Perrin formula [47]... 

The Perrin formulas are derived on the basis of a hydrodynamic approximation. That is, the rotating system is treated as a particle reorienting in a continuum solvent. This is a good approximation for a macromolecule immersed in a solvent of small molecules, but one would not a priori expect it to apply to the case of molecules such as benzene and mesitylene immersed in solvents composed of molecules of approximately... 

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