Franck-Rabinowitch hypothesis

Franck-Rabinowitch hypothesis

[¦fräŋk rə′bin·ə‚wich hī‚päth·ə·səs]
(physical chemistry)
The hypothesis that the decreased quantum efficiencies of certain photochemical reactions observed in the dissolved or liquid state are due to the formation of a cage of solvent molecules around the molecule which has been excited by absorption of a photon.