Abstract
The nonlinear optical properties of UV-coloured colloidal polytungstic acid imbedded in polyvinylalcohol film have been studied using a picosecond pump–probe technique. The intervalence charge transfer bands in the red-near IR region were found to exhibit transient bleaching that decays monoexponentially with the characteristic time of ∼300 ps. The results obtained are discussed in terms of the splitting of energy levels of metal ion in the ligand field and the delocalization of valence states.
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