Momentum imaging spectrometer for molecular fragmentation dynamics induced by pulsed electron beam

A momentum imaging spectrometer has been built for studying the electron impact molecular fragmentation dynamics. The setup consists of a pulsed electron gun and a time of flight system as well as a two-dimensional time and position sensitive multi-hit detector. The charged fragments with kinetic en...

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Bibliographic Details
Published in:Review of scientific instruments 2013-12, Vol.84 (12), p.123110-123110
Main Authors: Wang, EnLiang, Shan, Xu, Shi, YuFeng, Tang, YaGuo, Chen, XiangJun
Format: Article
Language:English
Subjects:
ANGULAR CORRELATION
ARGON
ATOMIC AND MOLECULAR PHYSICS
BERYLLIUM 6
CARBON DIOXIDE
CARBON MONOXIDE
Channels
COINCIDENCE SPECTROMETRY
Correlation analysis
Dynamics
ELECTRON BEAMS
Electron impact
ELECTRONS
EV RANGE
FRAGMENTATION
Imaging spectrometers
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
IONIZATION
KINETIC ENERGY
Momentum
OXYGEN IONS
Position sensing
POSITION SENSITIVE DETECTORS
PULSES
Scientific apparatus & instruments
TIME-OF-FLIGHT SPECTROMETERS
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Summary:A momentum imaging spectrometer has been built for studying the electron impact molecular fragmentation dynamics. The setup consists of a pulsed electron gun and a time of flight system as well as a two-dimensional time and position sensitive multi-hit detector. The charged fragments with kinetic energy up to 10 eV can be detected in 4π solid angles and their three-dimensional momentum vectors can be reconstructed. The apparatus is tested by electron impact ionization of Ar and dissociative ionization of CO2. By analyzing the ion-ion coincidence spectra, the complete and incomplete Coulomb fragmentation channels for \documentclass[12pt]{minimal}\begin{document}${\rm CO}_2^{2+}$\end{document} CO 2 2 + and \documentclass[12pt]{minimal}\begin{document}${\rm CO}_2^{3+}$\end{document} CO 2 3 + are identified. The kinetic energy release (KER) and angular correlation for the two-body breakup channel \documentclass[12pt]{minimal}\begin{document}${\rm CO}_2^{2+*}$\end{document} CO 2 2 + * → O+ + CO+ are reported. The peak value of total KER is found to be 6.8 eV which is consistent with the previous photoion-photoion coincidence studies, and the correlation angle of O+ and CO+ is also explicitly determined to be 172.5°.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4847156