https://doi.org/10.1140/epjd/e2010-00070-3
I. Electron-impact ionization and dissociation of C2 H2+ and C2 D2+
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, P.O. Box 386, 11000 Belgrade, Serbia
4
Institute of Physics, P.O. Box 68, 11081 Belgrade, Serbia
5
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
Absolute cross-sections for electron-impact ionization and dissociation of C2 H2+ and C2 D2+ have been measured for electron energies ranging from the corresponding thresholds up to 2.5 keV. The animated crossed beams experiment has been used. Light as well as heavy fragment ions that are produced from the ionization and the dissociation of the target have been detected for the first time. The maximum of the cross-section for single ionization is found to be (5.56±0.03)×10-17 cm2 around 140 eV. Cross-sections for dissociation of C2 H2+ (C2 D2+) to ionic products are seen to decrease for two orders of magnitude, from C2D+ (12.6±0.3)×10-17 cm2 over CH+ (9.55±0.06)×10-17 cm2, C+ (6.66±0.05)×10-17 cm2, C2+ (5.36± 0.27)×10-17 cm2, H+ (4.73±0.29)× 10-17 cm2 and CH2+ (4.56±0.27)×10-18 cm2 to H2+ (5.68±0.49)×10-19 cm2. Absolute cross-sections and threshold energies have been compared with the scarce data available in the literature.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010
