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Title: Absolute cross sections for dissociative electron attachment to HCN and DCN

Absolute partial cross sections for the formation of CN{sup -} 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 940pm{sup 2} for CN{sup -}/HCN and 340pm{sup 2} for CN{sup -}/DCN at peaks of the bands due to the {sup 2{Pi}}-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{sup -}, from which the branching ratios could be determined to be 1,0.49, and 0.22 for the formation of CN{sup -} 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)].
Authors:
; ;  [1]
  1. Department of Chemistry, University of Fribourg, Chemin du Musee 9, CH-1700 Fribourg (Switzerland)
Publication Date:
OSTI Identifier:
21440439
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 82; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.82.010701; (c) 2010 The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BRANCHING RATIO; CROSS SECTIONS; CYANIDES; DEUTERIUM COMPOUNDS; DISSOCIATION; ELECTRON ATTACHMENT; ELECTRONIC STRUCTURE; ELECTRON-MOLECULE COLLISIONS; ELECTRONS; EV RANGE; HYDROCYANIC ACID; RESONANCE; THRESHOLD ENERGY; TIME-OF-FLIGHT METHOD; VIBRATIONAL STATES COLLISIONS; DIMENSIONLESS NUMBERS; ELECTRON COLLISIONS; ELEMENTARY PARTICLES; ENERGY; ENERGY LEVELS; ENERGY RANGE; EXCITED STATES; FERMIONS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; LEPTONS; MOLECULE COLLISIONS