Abstract
Solvent effects on the nonradiative rate have been investigated for the zwitterionic form of rhodamine B dissolved in water-methanol mixtures, water-ethanol mixtures, monoalcohols (C 3 -C 10 ), ethylene glycol, and glycerol. The effect of solvent polarity is considered in the Arrhenius-type equation by introducing a polarity dependence into the activation energy and the effect of solvent viscosity is taken into account by including a fractional-viscosity factor in the preexponential coefficient
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