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A Surface Femtosecond Two-Photon Photoemission Spectrometer for Excited Electron Dynamics and Time-Dependent Photochemical Kinetics |
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| Authors: | Ze-feng Ren Chuan-yao Zhou Zhi-bo M Chun-lei Xiao Xin-chun Mao Dong-xu Dai Jerry LaRue Russell Cooper Alec M. Wodtke Xue-ming Yang |
| Affiliation: | State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China;Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA;Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA;Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA;State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian116023, China |
| Abstract: | A surface femtosecond two-photon photoemission (2PPE) spectrometer devoted to the study of ultrafast excited electron dynamics and photochemical kinetics on metal and metal oxide surfaces has been constructed. Low energy photoelectrons are measured using a hemispheri-cal electron energy analyzer with an imaging detector that allows us to detect the energy and the angular distributions of the photoelectrons simultaneously. A Mach-Zehnder interferom-eter was built for the time-resolved 2PPE (TR-2PPE) measurement to study ultrafast surface excited electron dynamics, which was demonstrated on the Cu(111) surface. A scheme for measuring time-dependent 2PPE (TD-2PPE) spectra has also been developed for studies of surface photochemistry. This technique has been applied to a preliminary study on the photochemical kinetics on ethanol/TiO2(110). We have also shown that the ultrafast dy-namics of photoinduced surface excited resonances can be investigated in a reliable way by combining the TR-2PPE and TD-2PPE techniques. |
| Keywords: | Femtosecond two-photon photoemission spectropy Time-resolved Ultrafast excited electron dynamics Surface photochemical kinetics |
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