Citation: ZHEN Cheng, TANG Xiao-Feng, ZHOU Xiao-Guo, LIU Shi-Lin. Application and Improvement in the Ion Velocity Imaging of Threshold Photoelectron-Photoion Coincidence Measurements[J]. Acta Physico-Chimica Sinica, ;2011, 27(07): 1574-1578. doi: 10.3866/PKU.WHXB20110633 shu

Application and Improvement in the Ion Velocity Imaging of Threshold Photoelectron-Photoion Coincidence Measurements

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 30 March 2011
Available Online: 10 May 2011
Fund Project: 国家自然科学基金(10979042, 21073173) (10979042, 21073173)国家重点基础研究发展规划项目(973) (2007CB815204)资助 (973) (2007CB815204)

A series of electrodes were used to form a new accelerated electric field for ion focusing optics of a threshold photoelectron-photoion coincidence (TPEPICO) mass spectrometer. Ion groups with higher kinetic energy gradually expanded along the direction of flight while they were restricted along the direction perpendicular to the flight tube. Consequently, contractible velocity imaging was achieved on the surface of the detector for all the ions where a magnification factor (N) of less than 1 was obtained for the images. Therefore, od kinetic energy resolution and mass resolving power were obtained simultaneously. Using this novel focusing lens the dissociation of vibrational state-selected O₂ ions in the B²Σ_g^- state was reinvestigated and three-dimentional time-sliced velocity images of the O fragment were recorded. By comparing the kinetic energy released distributions of the O that dissociated from the two dissociation channels, satisfied velocity imaging was obtained for the ions with a wide kinetic energy range.
- Ion velocity imaging,
- Threshold photoelectron-photoion coincidence,
- Time-of-flight mass spectrometer,
- Dissociation dynamics
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沈阳化工大学材料科学与工程学院沈阳 110142