Dielectric solvent effect on the radiative rate constant

3 DIELECTRIC SOLVENT EFFECT ON THE RADIATIVE RATE CONSTANT 

The radiative rate constant is related to the absorption intensity of the transition from the ground state to the excited state under consideration. The application of Eq. [11.2.2] leads to 

Note that the local-field correction factor n[s(n -1) -i-1] varies fi om n to n as s varies from 0 to 1. For 9,10-diphenylanthracene (DPA), the correction factor was given as n[(0.128)(n - 1) +1], which lies between n and n. This agrees with the observed data of fluorescence lifetimes of DPA in various solvents. 

Kittel, Introduction to Solid State Physics, 4th Ed., Wiley, New York, 1971, Chap. 13. 

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DIELECTRIC SOLVENT EFFECTS ON THE INTENSITY OF LIGHT ABSORPTION AND THE RADIATIVE RATE CONSTANT... 

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