Threshold photoelectron-photoion coincidence (TPEPICO) is a powerful method to prepare and analyze internal energy- or state-selected ions. Here, we review the state-of-the-art TPEPICO imaging technique combining with tunable vacuum ultraviolet (VUV) synchrotron radiation and its recent applications at Hefei Light Source (HLS), especially on the fundamental data measurement and the dissociation dynamics of ions. By applying the double velocity map imaging for both electrons and ions in coincidence, the collection efficiency of the charged particles, the electron energy resolution and the resolving power of the released kinetic energy in dissociation have been greatly improved. The kinetic energy and the angular distributions of fragment ions dissociated from parent ions with definitive internal energy or state have been acquired directly from TPEPICO images. Some dissociation mechanisms involving non-adiabatic quantum effects, like conical intersection and internal conversion, have been revealed. Moreover, the mass-selected threshold photoelectron spectroscopy (MS-TPES) shows tremendous advantages in isomer-specific analysis of complex systems.
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February 2019
Research Article|
February 01 2019
Dissociation dynamics of energy-selected ions using threshold photoelectron-photoion coincidence velocity imaging†
Xiang-kun Wu;
Xiang-kun Wu
a
Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Xiao-feng Tang;
Xiao-feng Tang
b
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
, Hefei 230031, China
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Xiao-guo Zhou;
Xiao-guo Zhou
*
a
Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Shi-lin Liu
Shi-lin Liu
*
a
Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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†
Dedicated to Professor Kopin Liu on the occasion of his 70th birthday.
Chin. J. Chem. Phys. 32, 11–22 (2019)
Article history
Received:
November 18 2018
Accepted:
December 13 2018
Citation
Xiang-kun Wu, Xiao-feng Tang, Xiao-guo Zhou, Shi-lin Liu; Dissociation dynamics of energy-selected ions using threshold photoelectron-photoion coincidence velocity imaging. Chin. J. Chem. Phys. 1 February 2019; 32 (1): 11–22. https://doi.org/10.1063/1674-0068/cjcp1811257
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