Absolute cross sections for dissociative electron attachment to HCN and DCN

May, Olivier; Kubala, D.; Allan, Michael

doi:10.1103/PhysRevA.82.010701

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Journal article

Absolute cross sections for dissociative electron attachment to HCN and DCN

May, Olivier Department of Chemistry, University of Fribourg, Switzerland
Kubala, D. Department of Chemistry, University of Fribourg, Switzerland
Allan, Michael Department of Chemistry, University of Fribourg, Switzerland

26.07.2010

Published in:

Physical Review A. - 2010, vol. 82, p. 010701

English Absolute partial cross sections for the formation of CN⁻ in dissociative electron attachment to HCN and DCN have been measured using a time-of-flight ion spectrometer combined with a trochoidal electron monochromator to be 940pm² for CN⁻/HCN and 340pm² for CN⁻/DCN at peaks of the bands due to the ²Π-shape resonance. The dissociative electron attachment bands were then recorded under higher resolution, 60 meV, with a trochoidal monochromator plus quadrupole mass filter combination and found to have a nearly vertical onset at the threshold energy and to peak at 1.85 eV. Broad structure was observed on the bands, assigned to formation of vibrationally excited CN⁻, from which the branching ratios could be determined to be 1,0.49, and 0.22 for the formation of CN⁻ in the v=0,1, and 2 states, respectively. The results are compared to the recent multidimensional ab initio calculations of Chourou and Orel [Phys. Rev. A 80, 032709 (2009)].

Faculty

Faculté des sciences et de médecine

Department

Département de Chimie

Language