Journal article

Low-energy electron attachment to the dichlorodifluoromethane (CCl₂F₂) molecule

  • Graupner, K. Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
  • Haughey, S. A. Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
  • Field, T. A. Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
  • Mayhew, C. A. Department of Physics and Astronomy, Queen’s University, Belfast, U.K. - School of Physics and Astronomy, University of Birmingham, U.K
  • Hoffmann, T. H. Département de Chimie, Université de Fribourg, Switzerland - Fachbereich Physik, Technische Universität Kaiserslautern, Germany
  • May, Olivier Département de Chimie, Université de Fribourg, Switzerland
  • Fedor, Juraj Département de Chimie, Université de Fribourg, Switzerland
  • Allan, Michael Département de Chimie, Université de Fribourg, Switzerland
  • Fabrikant, Ilya I. Department of Physics and Astronomy, University of Nebraska, Lincoln, USA
  • Illenberger, E. Physikalische und Theoretische Chemie, Freie Universität Berlin, Germany
  • Braun, M. Fachbereich Physik, Technische Universität Kaiserslautern, Germany
  • Ruf, M.-W. Fachbereich Physik, Technische Universität Kaiserslautern, Germany
  • Hotop, Hartmut Fachbereich Physik, Technische Universität Kaiserslautern, Germany
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    29.12.2009
Published in:
  • The Journal of Physical Chemistry A. - 2010, vol. 114, no. 3, p. 1474–1484
English Results from a joint experimental study of electron attachment to dichlorodifluoromethane (CCl₂F₂) molecules in the gas phase are reported. In a high resolution electron beam experiment involving two versions of the laser photoelectron attachment method, the relative cross section for formation of the dominant anion Cl⁻ was measured over the energy range 0.001−1.8 eV at the gas temperature TG = 300 K. It exhibits cusp structure at thresholds for vibrational excitation of the ν₃(a₁) mode due to interaction with the attachment channels. With reference to the thermal attachment rate coefficient k(T = 300 K) = 2.2(8) × 10⁻⁹ cm³ s⁻¹ (fitted average from several data), a new highly resolved absolute attachment cross section for TG = 300 K was determined. Partial cross sections for formation of the anions Cl⁻, Cl₂⁻, F⁻, ClF⁻, and CCl₂F⁻ were measured over the range 0−12 eV, using three different electron beam experiments of medium energy resolution. The dependence of the attachment rate coefficient k(Te;TG = 300 K) on electron temperature Te was calculated over the range 50−15000 K, based on a newly constructed total cross section for anion formation at TG = 300 K. R-matrix calculations for Cl⁻ production have been carried out for comparison with the experimental data. The R-matrix results are in line with the main experimental observations and predict the dependence of the DEA cross section on the initial vibrational level ν₃ and on the vibrational temperature. Furthermore, the cross section for vibrational excitation of the ν₃ mode has been computed.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301458
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