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

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Ren,  Xueguang
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany;

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Pflüger,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany;

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Weyland,  Marvin
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany;

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Dorn,  Alexander
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Citation

Ren, X., Pflüger, T., Weyland, M., Baek, W. Y., Rabus, H., Ullrich, J., et al. (2015). High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane. The Journal of Chemical Physics, 142(17): 174313. doi:10.1063/1.4919691.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-9E06-2
Abstract
The ionization and fragmentation of methane induced by low-energy (E 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 +4 , CH +3 , CH +2 , CH+, and C+ 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.