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Title: High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane

Abstract

The ionization and fragmentation of methane induced by low-energy (E{sub 0} = 66 eV) electron-impact is investigated using a reaction microscope. The momentum vectors of all three charged final state particles, two outgoing electrons, and one fragment ion, are detected in coincidence. Compared to the earlier study [Xu et al., J. Chem. Phys. 138, 134307 (2013)], considerable improvements to the instrumental mass and energy resolutions have been achieved. The fragment products CH{sub 4}{sup +}, CH{sub 3}{sup +}, CH{sub 2}{sup +}, CH{sup +}, and C{sup +} are clearly resolved. The binding energy resolution of ΔE = 2.0 eV is a factor of three better than in the earlier measurements. The fragmentation channels are investigated by measuring the ion kinetic energy distributions and the binding energy spectra. While being mostly in consistence with existing photoionization studies the results show differences including missing fragmentation channels and previously unseen channels.

Authors:
; ;  [1];  [2]; ; ;  [1];  [3]
  1. Physikalisch-Technische Bundesanstalt, 38116 Braunschweig (Germany)
  2. (Germany)
  3. Max-Planck-Institut für Kernphysik, 69117 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
22415749
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 142; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BINDING ENERGY; CARBON IONS; COMPARATIVE EVALUATIONS; ELECTRON-MOLECULE COLLISIONS; ELECTRONS; ENERGY RESOLUTION; EV RANGE; FRAGMENTATION; KINETIC ENERGY; METHANE; MOLECULAR IONS; PHOTOIONIZATION

Citation Formats

Ren, Xueguang, E-mail: xue.g.ren@ptb.de, Pflüger, Thomas, Weyland, Marvin, Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Baek, Woon Yong, Rabus, Hans, Ullrich, Joachim, and Dorn, Alexander. High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane. United States: N. p., 2015. Web. doi:10.1063/1.4919691.
Ren, Xueguang, E-mail: xue.g.ren@ptb.de, Pflüger, Thomas, Weyland, Marvin, Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Baek, Woon Yong, Rabus, Hans, Ullrich, Joachim, & Dorn, Alexander. High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane. United States. doi:10.1063/1.4919691.
Ren, Xueguang, E-mail: xue.g.ren@ptb.de, Pflüger, Thomas, Weyland, Marvin, Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Baek, Woon Yong, Rabus, Hans, Ullrich, Joachim, and Dorn, Alexander. Thu . "High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane". United States. doi:10.1063/1.4919691.
@article{osti_22415749,
title = {High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane},
author = {Ren, Xueguang, E-mail: xue.g.ren@ptb.de and Pflüger, Thomas and Weyland, Marvin and Max-Planck-Institut für Kernphysik, 69117 Heidelberg and Baek, Woon Yong and Rabus, Hans and Ullrich, Joachim and Dorn, Alexander},
abstractNote = {The ionization and fragmentation of methane induced by low-energy (E{sub 0} = 66 eV) electron-impact is investigated using a reaction microscope. The momentum vectors of all three charged final state particles, two outgoing electrons, and one fragment ion, are detected in coincidence. Compared to the earlier study [Xu et al., J. Chem. Phys. 138, 134307 (2013)], considerable improvements to the instrumental mass and energy resolutions have been achieved. The fragment products CH{sub 4}{sup +}, CH{sub 3}{sup +}, CH{sub 2}{sup +}, CH{sup +}, and C{sup +} are clearly resolved. The binding energy resolution of ΔE = 2.0 eV is a factor of three better than in the earlier measurements. The fragmentation channels are investigated by measuring the ion kinetic energy distributions and the binding energy spectra. While being mostly in consistence with existing photoionization studies the results show differences including missing fragmentation channels and previously unseen channels.},
doi = {10.1063/1.4919691},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 17,
volume = 142,
place = {United States},
year = {2015},
month = {5}
}