I. Electron-impact ionization and dissociation of C2H2+ and C2D2

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 58; no. 1; pp. 75 - 83
• Main Authors: Cherkani-Hassani, H., Cherkani-Hassani, S., Belic, D. S., Jureta, J. J., Lecointre, J., Defrance, P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 2010; EDP Sciences
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Atomic and molecular collision processes and interactions; Atomic and Molecular Collisions; Atomic and molecular physics; Electron scattering; Electron-ion scattering; excitation and ionization; Exact sciences and technology; Molecular; Optical and Plasma Physics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Information Technology; Quantum Physics; Spectroscopy/Spectrometry; Spintronics; Fragment Production; Electron Energy; Single Ionization; Dissociative Ionization; Dissociative Excitation; Organic cation; Crossed beams; Heavy ions; Electron impact ionization; Electron-ion collisions; Isotope effects; Deuterium Compounds; Cross sections; Molecular dissociation
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/e2010-00070-3

Absolute cross-sections for electron-impact ionization and dissociation of C
2
H
2
+
and C
2
D
2
+
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
 cm
2
around 140 eV. Cross-sections for dissociation of C
2
H
2
+
(C
2
D
2
+
) to ionic products are seen to decrease for two orders of magnitude, from C
2
D
+
(12.6 ± 0.3) × 10
-17
 cm
2
over CH
+
(9.55 ± 0.06) × 10
-17
 cm
2
, C
+
(6.66 ± 0.05) × 10
-17
 cm
2
, C
2
+
(5.36 ± 0.27) × 10
-17
 cm
2
, H
+
(4.73 ± 0.29) × 10
-17
 cm
2
and CH
2
+
(4.56 ± 0.27) × 10
-18
 cm
2
to H
2
+
(5.68 ± 0.49) × 10
-19
 cm
2
. Absolute cross-sections and threshold energies have been compared with the scarce data available in the literature.