Electron-impact ionization and dissociation of C2D+

J. Lecointre; H. Cherkani-Hassani; S. Cherkani-Hassani; D. S. Belic; J. J. Jureta; P. Defrance

doi:10.1140/epjd/e2010-00224-3

2021 Impact factor 1.611

Atomic, Molecular, Optical and Plasma Physics

Eur. Phys. J. D 60, 331-345 (2010)
https://doi.org/10.1140/epjd/e2010-00224-3

Electron-impact ionization and dissociation of C₂D⁺

J. Lecointre¹^a, H. Cherkani-Hassani¹, S. Cherkani-Hassani¹^,2, D. S. Belic¹^,3, J. J. Jureta¹^,4 and P. Defrance¹

¹ Université catholique de Louvain, Institute of Condensed Matter and Nanosciences, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium
² Université Cadi Ayyad, Faculté Polydisciplinaire de Safi, Département des Sciences de la Matière, P.O. Box 4162, 46000 Safi, Morocco
³ Faculty of Physics, University of Belgrade, P.O. Box 386, 11000 Belgrade, Serbia
⁴ Institute of Physics, University of Belgrade, P.O. Box 68, 11081 Belgrade, Serbia

Corresponding author: ^a julien.lecointre@uclouvain.be

Received: 10 May 2010
Revised: 18 June 2010
Published online: 8 September 2010

Abstract

Absolute cross sections for electron-impact single ionization, dissociative excitation and dissociative ionization of the ethynyl radical ion (C₂D have been measured for electron energies ranging from the corresponding reaction thresholds to 2.5 keV. The animated crossed electron-ion beam experiment is used and results have been obtained for the production of C₂D²⁺, C²⁺, C, CD⁺, C⁺ and D⁺. The maximum of the cross section for single ionization is found to be (2.01 ± 0.02) × 10^-17 cm², at the incident electron energy of 105 eV. Absolute total cross sections for the various singly charged fragments production are observed to decrease by a factor of almost three, from the largest cross-section measured for C⁺, over C and CD⁺ down to that of D⁺. The maxima of the cross sections are obtained to be (14.5 ± 0.5) × 10^-17 cm² for C, (12.1 ± 0.1) × 10^-17 cm² for CD⁺, (27.7 ± 0.2) × 10^-17 cm² for C⁺ and (11.1 ± 0.8) × 10^-17 cm² for D⁺. The smallest cross section is measured to be (1.50 ± 0.04) × 10^-18 cm² for the production of the doubly charged ion C²⁺. Individual contributions for dissociative excitation and dissociative ionization are determined for each singly-charged product. The cross sections are presented in closed analytic forms convenient for implementation in plasma simulation codes. Kinetic energy release distributions of dissociation fragments are seen to extend from 0 to 6 eV for the heaviest fragment C, up to 11.0 eV for CD⁺, 14.2 eV for C⁺ and 11.2 eV for D⁺ products.