Eur. Phys. J. D 58, 85-94 (2010)
https://doi.org/10.1140/epjd/e2010-00071-2

II. Electron-impact dissociative excitation of C2H ₂⁺ and C ₂D ₂⁺

¹ Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium
² Faculty of Physics, PO Box 386, 11000 Belgrade, Serbia
³ Institute of Physics, PO Box 68, 11081 Belgrade, Serbia
⁴ Durham University, Department of Chemistry, South Road, Durham, DH1 3LE, UK

Corresponding author: julien.lecointre@uclouvain.be

Received: 27 November 2009
Revised: 26 February 2010
Published online: 23 March 2010

Abstract

Absolute cross-sections for electron-impact dissociative excitation of C₂H₂⁺ and C₂D₂⁺ to C₂D⁺, CH⁺, C⁺, C₂⁺, H⁺ and CH₂⁺ singly-charged fragments have been estimated. The animated crossed-beams method is applied in the energy range from the corresponding reaction threshold up to 2.5 keV. Individual contributions for dissociative excitation are determined from the analysis of the total absolute cross-sections measured for each detected product. The dissociative excitation cross-sections are seen to decrease for more than an order of magnitude, from C₂D⁺ (12.6±0.3)×10^-17 cm² over CH⁺ (6.37±0.12)×10^-17 cm², C⁺ (4.09±0.13)×10^-17 cm², C₂⁺ (3.5±0.2)×10^-17 cm² and H⁺ (1.57±0.11)×10^-17 cm² to CH₂⁺ (3.6±0.5)×10^-18 cm². Cross-section values and threshold energies are compared with the data which are available from the literature.