Xia Wu, Zheng-bo Qin, Hua Xie, Xiao-hu Wu, Ran Cong, Zi-chao Tang. Collinear Velocity-map Photoelectron Imaging Spectrometer for Cluster Anions[J]. Chinese Journal of Chemical Physics , 2010, 23(4): 373-380. doi: 10.1088/1674-0068/23/04/373-380
Citation: Xia Wu, Zheng-bo Qin, Hua Xie, Xiao-hu Wu, Ran Cong, Zi-chao Tang. Collinear Velocity-map Photoelectron Imaging Spectrometer for Cluster Anions[J]. Chinese Journal of Chemical Physics , 2010, 23(4): 373-380. doi: 10.1088/1674-0068/23/04/373-380

Collinear Velocity-map Photoelectron Imaging Spectrometer for Cluster Anions

doi: 10.1088/1674-0068/23/04/373-380
Funds:  We thank Professor Hai-yang Li for simulation elec-tron trajectory, and H. Reisler for providing the im-age analysis software. This work was supported by the National Natural Science Foundation of China(No.20773126), the Ministry of Science and Technology of China, and the Chinese Academy of Sciences.
  • Received Date: 2010-04-13
  • 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.

     

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