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A Surface Femtosecond Two-Photon Photoemission Spectrometer for Excited Electron Dynamics and Time-Dependent Photochemical Kinetics
Ze-feng Ren,Chuan-yao Zhou,Zhi-bo Ma,Chun-lei Xiao,Xin-chun Mao,Dong-xu Dai,Jerry LaRue,Russell Cooper,Alec M. Wodtke,Xue-ming Yang
Author NameAffiliationE-mail
Ze-feng Ren State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Chuan-yao Zhou State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Zhi-bo Ma State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Chun-lei Xiao State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Xin-chun Mao State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Dong-xu Dai State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Jerry LaRue Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA  
Russell Cooper Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA  
Alec M. Wodtke Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA 93106, USA  
Xue-ming Yang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China xmyang@dicp.ac.cn 
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.
Key words:  Femtosecond two-photon photoemission spectropy, Time-resolved, Ultrafast excited electron dynamics, Surface photochemical kinetics
FundProject:
A Surface Femtosecond Two-Photon Photoemission Spectrometer for Excited Electron Dynamics and Time-Dependent Photochemical Kinetics
任泽峰,周传耀,马志博,肖春雷,毛新春,戴东旭,Jerry LaRue,Russell Cooper,Alec M. Wodtke,杨学明*
摘要:
搭建了一套研究金属和金属氧化物表面的超快激发态电子动力学和光化学动力学的飞秒双光子光电子能谱仪. 该装置将半球形电子能量分析仪和成像技术相结合,同时测量光电子的能量和角度分布.通过Mach-Zehnder干涉仪测量时间分辨的双光子光电子能谱获得超快激发电子态的动力学信息. 这一功能在Cu(111)上得到了证实. 另外还发展了一个通过实时测量双光子光电子能谱来研究表面光化学的方法,并成功应用到CH3CH2OH/TiO2(110)体系. 研究表明,只有将两种方法结合起来才能正确地研究光诱导的表面激发共振的动力学.
关键词:  飞秒双光子光电子能谱,时间分辨,表面超快激发态电子动力学,表面光化学动力学
DOI:10.1088/1674-0068/23/03/255-261
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