A Surface Femtosecond Two-Photon Photoemission Spectrometer for Excited Electron Dynamics and Time-Dependent Photochemical Kinetics  

表面电子激发态动力学和光化学动力学的飞秒双光子光电了能谱仪

作　　者：任洋峰[1] 周传耀[1] 马志博[1] 肖春雷[1] 毛新春[1] 戴东旭[1] Jerry LaRueb Russell Cooper Alec M. Wodtke 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]加州大学圣芭芭拉分校化学与生物化学系,CA93106

出　　处：《Chinese Journal of Chemical Physics》2010年第3期255-261,I0001,共8页化学物理学报（英文）

摘　　要：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 hemispherical 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 dynamics of photoinduced surface excited resonances can be investigated in a reliable way by combining the TR-2PPE and TD-2PPE techniques.

关 键 词：Femtosecond two-photon photoemission spectropy TIME-RESOLVED Ultrafast excited electron dynamics Surface photochemical kinetics 

分 类 号：O[理学]