フェムト秒拡散反射分光法の開発と酸化チタン光触媒粉末への応用 Development of Femtosecond Diffuse Reflectance Spectroscopy and Its Application to TiO_2 Powder Catalysts
Femtosecond diffuse reflectance spectroscopy for studying ultrafast photophysical and photochemical processes of optically scattering materials has been developed and applied to photocatalytic TiO<SUB>2</SUB> powders. It is demonstrated that the spectroscopy has the similar spectroscopic and temporal resolutions to those of transmittance mode transient absorption one. Temporal behavior of diffuse reflected light is analysed by extended Kubelka-Munk model and simulated numerically. Excitation energy relaxation processes of TiO<SUB>2</SUB> powders are measured directly in femtosecond to nanosecond time domains, and electron-hole charge separa-tion and recombination dynamics, and charge transfer to adsorbed molecules on TiO<SUB>2</SUB> surface are made clear. The results are discussed in terms of physical and structural properties of TiO<SUB>2</SUB> and environmental conditions.
- 分光研究 = Journal of the spectroscopical research of Japan
分光研究 = Journal of the spectroscopical research of Japan 48(4), 143-153, 1999-08-15
The Spectroscopical Society of Japan