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

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
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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