Characterization of the Excited State on Methanol/TiO2(110) Interface (cited:2) |
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Authors: | Zhi-qiang Wang Qun-qing Hao Xin-chun Mao Chuan-yao Zhou Zhi-bo Ma Ze-feng Ren Dong-xu Dai Xue-ming Yang |
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Affiliation: | 1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China2.nternational Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China;Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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Abstract: | The electronic structure of methanol/TiO2(110) interface has been studied by photoemission 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 vefold coordinated Ti sites (Ti5c) on TiO2(110) surface [Chemical 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 suggest 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 characterization 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. |
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Keywords: | Titanium dioxide Excited states Two-photon photoemission Time-resolved |
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