Low-energy electron attachment to the dichlorodifluoromethane (CCl₂F₂) molecule
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Graupner, K.
Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
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Haughey, S. A.
Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
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Field, T. A.
Department of Physics and Astronomy, Queen’s University, Belfast, U.K.
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Mayhew, C. A.
Department of Physics and Astronomy, Queen’s University, Belfast, U.K. - School of Physics and Astronomy, University of Birmingham, U.K
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Hoffmann, T. H.
Département de Chimie, Université de Fribourg, Switzerland - Fachbereich Physik, Technische Universität Kaiserslautern, Germany
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May, Olivier
Département de Chimie, Université de Fribourg, Switzerland
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Fedor, Juraj
Département de Chimie, Université de Fribourg, Switzerland
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Allan, Michael
Département de Chimie, Université de Fribourg, Switzerland
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Fabrikant, Ilya I.
Department of Physics and Astronomy, University of Nebraska, Lincoln, USA
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Illenberger, E.
Physikalische und Theoretische Chemie, Freie Universität Berlin, Germany
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Braun, M.
Fachbereich Physik, Technische Universität Kaiserslautern, Germany
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Ruf, M.-W.
Fachbereich Physik, Technische Universität Kaiserslautern, Germany
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Hotop, Hartmut
Fachbereich Physik, Technische Universität Kaiserslautern, Germany
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Chimie
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Language
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Classification
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Chemistry
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/301458
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