Dissociative electron attachment to three isomers of bromo-chlorotoluene was investigated in the electron energy range from 0 to 2 eV for gas temperatures in the range of 392-520 K using a crossed electron-molecular beam apparatus with a temperature regulated effusive molecular beam source. For all three molecules, both Cl− and Br− are formed. The ion yields of both halogenides show a pronounced temperature effect. In the case of Cl− and Br−, the influence of the gas temperature can be observed at the threshold peak close to 0 eV. The population of molecules that have some of their out-of-plane modes excited varies strongly in the temperature range investigated, indicating that such vibrations might play a role in the energy transfer towards bond breaking. Potential energy curves for the abstraction of Cl− and Br− were calculated and extrapolated into the metastable domain. The barriers in the diabatic curves approximated in this way agree well with the ones derived from the temperature dependence observed in the experiments.
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Temperature dependence of dissociative electron attachment to bromo-chlorotoluene isomers: Competition between detachment of Cl− and Br−
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21 February 2018
Research Article|
February 15 2018
Temperature dependence of dissociative electron attachment to bromo-chlorotoluene isomers: Competition between detachment of Cl− and Br−
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Masoomeh Mahmoodi-Darian
;
Masoomeh Mahmoodi-Darian
a)
1
Department of Physics, Karaj Branch, Islamic Azad University
, Karaj, Iran
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Stefan E. Huber;
Stefan E. Huber
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Andreas Mauracher;
Andreas Mauracher
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Michael Probst;
Michael Probst
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Stephan Denifl;
Stephan Denifl
a)
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Paul Scheier
;
Paul Scheier
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Tilmann D. Märk
Tilmann D. Märk
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
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Masoomeh Mahmoodi-Darian
1,a)
Stefan E. Huber
2
Andreas Mauracher
2
Michael Probst
2
Stephan Denifl
2,a)
Paul Scheier
2
Tilmann D. Märk
2
1
Department of Physics, Karaj Branch, Islamic Azad University
, Karaj, Iran
2
Institut für Ionenphysik und Angewandte Physik, University of Innsbruck
, Technikerstraße 25, 6020, Innsbruck, Austria
a)
Authors to whom correspondence should be addressed: [email protected] and [email protected]
J. Chem. Phys. 148, 074301 (2018)
Article history
Received:
November 13 2017
Accepted:
January 29 2018
Citation
Masoomeh Mahmoodi-Darian, Stefan E. Huber, Andreas Mauracher, Michael Probst, Stephan Denifl, Paul Scheier, Tilmann D. Märk; Temperature dependence of dissociative electron attachment to bromo-chlorotoluene isomers: Competition between detachment of Cl− and Br−. J. Chem. Phys. 21 February 2018; 148 (7): 074301. https://doi.org/10.1063/1.5013606
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