Journal article

Isotope effect in dissociative electron attachment to acetylene

  • May, Olivier Department of Chemistry, University of Fribourg, Switzerland
  • Fedor, Juraj Department of Chemistry, University of Fribourg, Switzerland - J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
  • Allan, Michael Department of Chemistry, University of Fribourg, Switzerland
Published in:
  • Physical Review A. - 2009, vol. 80, no. 1, p. 012706
English Absolute partial cross sections for dissociative electron attachment to H–C≡C–H and D–C≡C–D have been measured using a time-of-flight ion spectrometer combined with a trochoidal electron monochromator. For C₂H₂ the present data are in good agreement with the total cross sections measured previously in our laboratory using the total ion-collection method. The present measurements on deuterated acetylene revealed a pronounced isotope effect at the first dissociative electron attachment band at 3 eV, with the cross section for C₂D⁻/C₂D₂ being 14.4 times smaller than that for C₂H⁻/C₂H₂. The dominant fragments at the second dissociative attachment band around 8 eV are the light fragments H⁻ or D⁻. These bands exhibit weaker isotope effects, in agreement with their assignment to Feshbach resonances with narrow autodetachment widths.
Faculté des sciences et de médecine
Département de Chimie
  • English
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