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Electron impact excitation of methane: determination of appearance energies for dissociation products

  • Danko, M. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
  • Orszagh, J. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
  • Ďurian, M. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
  • Kočišek, J. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
  • Daxner, M. Institute for Ion Physics and Applied Physics, Association Euroatom ÖAW, University of Innsbruck, Austria
  • Zöttl, S. Institute for Ion Physics and Applied Physics, Association Euroatom ÖAW, University of Innsbruck, Austria
  • Maljković, J. B. Laboratory for Atomic Collision Processes, Institute of Physics, University of Belgrade, Serbia
  • Fedor, Juraj Department of Chemistry, University of Fribourg, Switzerland
  • Scheier, P. Institute for Ion Physics and Applied Physics, Association Euroatom ÖAW, University of Innsbruck, Austria
  • Denifl, S. Institute for Ion Physics and Applied Physics, Association Euroatom ÖAW, University of Innsbruck, Austria
  • Matejčík, Š. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
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    18.02.2013
Published in:
  • Journal of Physics B: Atomic, Molecular and Optical Physics. - 2013, vol. 46, no. 4, p. 045203
English In this work, we present an experimental study of dissociative excitation of CH₄ utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet–visible (UV/VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4...9→2, and moreover, CH: A²Δ→X²Π, CH: B²Σ⁻→ X²Π, CH: C²Σ⁺→ X²Π, CH⁺: B¹Δ→ A¹Π, and CI: 2p3s ¹Po₁→2p² ¹S₀). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ~1–2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/302979
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