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Title: A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation

Abstract

A novel threshold photoelectron-photoion coincidence (TPEPICO) imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is applied to magnify images of photoelectrons instead of traditional accelerating electric field in order to suppress the contribution of energetic electrons in the threshold photoelectron spectroscopy (TPES) and the mass-selected TPEPICO spectroscopy. The typical energy resolution of TPES is measured to be 9 meV (full width at half maximum), as shown on the {sup 2}P{sub 1/2} ionization of argon. The measured mass resolving power for the present TPEPICO imaging spectrometer is above 900 of M/{Delta}M. Subsequently as a benchmark, oxygen molecule is photoionized by monochromatic synchrotron radiation at 20.298 eV and dissociates to an oxygen atomic ion and a neutral oxygen atom, and the translation energy distribution of oxygen atomic ion is measured by the time-sliced imaging based on mass-selected TPEPICO experiment. The kinetic energy resolution of the present ion velocity imaging is better than 3% of {Delta}E/E.

Authors:
; ; ;  [1]; ; ; ;  [2]
  1. Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)
  2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029 (China)
Publication Date:
OSTI Identifier:
22051073
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 80; Journal Issue: 11; Other Information: (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ARGON; ATOMIC IONS; BENCHMARKS; COINCIDENCE SPECTROMETRY; ELECTRIC FIELDS; ENERGY RESOLUTION; ENERGY SPECTRA; EV RANGE; IMAGES; KINETIC ENERGY; LENSES; MASS SPECTROSCOPY; MEV RANGE; MONOCHROMATIC RADIATION; OXYGEN; PHOTOELECTRON SPECTROSCOPY; PHOTOIONIZATION; SYNCHROTRON RADIATION; TAIL ELECTRONS

Citation Formats

Xiaofeng, Tang, Xiaoguo, Zhou, Mingli, Niu, Shilin, Liu, Jinda, Sun, Xiaobin, Shan, Fuyi, Liu, and Liusi, Sheng. A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation. United States: N. p., 2009. Web. doi:10.1063/1.3250872.
Xiaofeng, Tang, Xiaoguo, Zhou, Mingli, Niu, Shilin, Liu, Jinda, Sun, Xiaobin, Shan, Fuyi, Liu, & Liusi, Sheng. A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation. United States. https://doi.org/10.1063/1.3250872
Xiaofeng, Tang, Xiaoguo, Zhou, Mingli, Niu, Shilin, Liu, Jinda, Sun, Xiaobin, Shan, Fuyi, Liu, and Liusi, Sheng. Sun . "A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation". United States. https://doi.org/10.1063/1.3250872.
@article{osti_22051073,
title = {A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation},
author = {Xiaofeng, Tang and Xiaoguo, Zhou and Mingli, Niu and Shilin, Liu and Jinda, Sun and Xiaobin, Shan and Fuyi, Liu and Liusi, Sheng},
abstractNote = {A novel threshold photoelectron-photoion coincidence (TPEPICO) imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is applied to magnify images of photoelectrons instead of traditional accelerating electric field in order to suppress the contribution of energetic electrons in the threshold photoelectron spectroscopy (TPES) and the mass-selected TPEPICO spectroscopy. The typical energy resolution of TPES is measured to be 9 meV (full width at half maximum), as shown on the {sup 2}P{sub 1/2} ionization of argon. The measured mass resolving power for the present TPEPICO imaging spectrometer is above 900 of M/{Delta}M. Subsequently as a benchmark, oxygen molecule is photoionized by monochromatic synchrotron radiation at 20.298 eV and dissociates to an oxygen atomic ion and a neutral oxygen atom, and the translation energy distribution of oxygen atomic ion is measured by the time-sliced imaging based on mass-selected TPEPICO experiment. The kinetic energy resolution of the present ion velocity imaging is better than 3% of {Delta}E/E.},
doi = {10.1063/1.3250872},
url = {https://www.osti.gov/biblio/22051073}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 11,
volume = 80,
place = {United States},
year = {2009},
month = {11}
}