Characterization of the Excited State on Methanol/Ti02（110） Interface  

甲醇／TiO2（110）界面激发态的表征

作　　者：王志强[1] 郝群庆 毛新春[1] 周传耀[1] 马志博[1] 任泽峰[2,3] 戴东旭[1] 杨学明[1] 

机构地区：[1]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023 [2]北京大学物理学院量子材料科学中心,北京100871 [3]量子物质科学协同创新中心,北京100871

出　　处：《Chinese Journal of Chemical Physics》2015年第2期123-127,I0001,共6页化学物理学报（英文）

摘　　要：The electronic structure of methanol/TiO2（ll0） interface has been studied by photoemis- sion spectroscopy. The pronounced resonance which appears at 5.5 eV above the Fermi level in two-photon photoemission spectroscopy （2PPE） is associated with the photocatalyzed dissociation of methanol at fivefold coordinated Ti sites （Ti5c） on TiO2 （110） surface [Chem- ical Science 1, 575 （2010）]. To check whether this resonance signal arises from initial or intermediate states, photon energy dependent 2PPE and comparison between one-photon photoemission spectroscopy and 2PPE have been performed. Both results consistently sug- gest the resonance signal originates from the initially unoccupied intermediate states, i.e., excited states. Dispersion measurements suggest the excited state is localized. Time-resolved studies show the lifetime of the excited state is 24 fs. This work presents comprehensive char- acterization of the excited states on methanol/TiO2（110） interface, and provides elaborate experimental data for the development of theoretical methods in reproducing the excited states on TiO2 surfaces and interfaces.

关 键 词：Titanium dioxide Excited states Two-photon photoemission TIME-RESOLVED 

分 类 号：O[理学]