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Direct observation of interfacial hole transfer from a photoexcited TiO2 particle to an adsorbed molecule SCN- by femtosecond diffuse reflectance spectroscopy

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On the basis of transient absorption spectral measurements in the whole visible region using femtosecond diffuse reflectance spectroscopy, a hole transfer process from photoexcited TiO2 to an adsorbed molecule SCN- was elucidated. In a TiO2 aqueous suspension with KSCN, absorption rise of dimer radical anion (SCN)•2- was observed indicating hole transfer. Interestingly, there were two rise components with <1 ps and several 100 ps, which were shorter in lower pH of the solution. Ultrafast hole transfer and subsequent intermolecular geometrical change of a dimmer radical anion are also discussed.

Affiliations: 1: Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan; 2: Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture, Gakuen-cho


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