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Collinear Velocity-map Photoelectron Imaging Spectrometer for Cluster Anions
Xia Wu,Zheng-bo Qin,Hua Xie,Xiao-hu Wu,Ran Cong,Zi-chao Tang*
Author NameAffiliationE-mail
Xia Wu State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Zheng-bo Qin State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Hua Xie State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Xiao-hu Wu State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Ran Cong State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Zi-chao Tang* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China zctang@dicp.ac.cn 
Abstract:
We describe a collinear velocity-map photoelectron imaging spectrometer, which combines a Wiley-McLaren time-of-flight mass analyzer with a dual-valve laser vaporization source for investigating size-selected cluster and reaction intermediate anions. To generate the reaction anions conveniently, two pulsed valves and a reaction channel are employed instead of premixing carrier gas. The collinear photoelectron imaging spectrometer adopts modified velocity-map electrostatic lens, and provides kinetic energy resolution better than 3%. The performance of the instrument is demonstrated on the photodetachment of Si4- at 532 and 355 nm, and Si3C- at 532 nm, respectively. In both cases, photoelectron spectra and anisotropy parameters are obtained from the images. For Si4-, the spectra show two well-resolved vibrational progressions which correspond to the ground state and the first excited state of the neutral Si4 with peak spacing of 330 and 312 cm-1, respectively. Preliminary results suggest that the apparatus is a powerful tool for characterizing the electronic structure and photodetachment dynamics of cluster anions.
Key words:  Laser vaporization source, Photodetachment, Cluster
FundProject:
用于团簇负离子的共线光电子速度成像仪
吴侠,秦正波,谢华,吴小虎,丛然,唐紫超*
摘要:
描述了包含共线的光电子速度成像仪,以及与双阀激光溅射团簇源联用的时间飞行质谱装置.为了避免预混气体,两个脉冲阀和一个反应通道被用来产生反应负离子.共线的光电子成像仪采用了改进的速度成像透镜系统,它的能量分辨率优于3%.此外还报道了Si4-团簇在532和355 nm,以及Si3C- 团簇在532 nm的光电子速度成像.从实验图像中可以获得光电子能谱和各向异性参数.从Si4-团簇能谱上获得了中性的Si4团簇的基态和第一激发态的振动频率分别为330和312 cm-1.初步的实验结果证明这套光电子成像装置对研究团簇负离子的电子结构以及光脱附动力学非常有效.
关键词:  激光溅射源,团簇,光脱附
DOI:10.1088/1674-0068/23/04/373-380
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