Electron-impact ionization and dissociation of C2D+

Section: Ionizationsupporting

confidence: 86%

“…The apparatus and the experimental method have been previously described in detail (Lecointre et al 2006). NH + ions are extracted from an ECR ion source in …”

Section: Experimental Methods and Apparatusmentioning

confidence: 99%

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Electron-impact dissociation and ionization of NH⁺: formation of N⁺and N²⁺

Lecointre¹,

Jureta²,

Defrance³

2010

“…The total uncertainty (90% confidence limit) for the absolute cross sections is estimated to be about 10%, at maximum, and that associated to the electron energy is estimated to be ±0.5 eV [14]. fragments.…”

Section: Experimental Methods and Apparatusmentioning

confidence: 95%

“…In the present experiment, individual ionic fragments result from both DE and DI reactions. A specific procedure has been developed to separate the contributions and absolute cross sections are reported separately for DE and for DI, from their respective thresholds up to 2.5 keV [14].…”

Section: Introductionmentioning

confidence: 99%

Isotope effects in electron-impact dissociation of D₂H⁺

Defrance¹,

Jureta²,

Lecointre³

et al. 2011

Absolute cross sections have been measured using the crossed electron–ion beams method for electron-impact dissociation of the D2H+ molecular ion yielding H+, D+, HD+ and D+2 fragments. The collision energy ranges from a few eV up to 2.5 keV. Around the maximum, cross sections are found to be of a similar amplitude: (3.25 ± 0.08) × 10−17 cm2 for H+, (3.56 ± 0.15) × 10−17 cm2 for HD+ and (3.33 ± 0.11) × 10−17 cm2 for D+2, except for D+ for which the maximum cross section is (4.62 ± 0.09) × 10−17 cm2. Individual contributions for dissociative excitation (DE) and for dissociative ionization (DI) are determined for each product. Close analysis of present data brings into evidence isotope effects in the fragmentation pattern of the D2H+ target. Ejection of the lightest isotope is generally favoured: for resonant DE (H+ over D+), for DE (molecular ions D+2 and HD+, associated with ejection of H and D, respectively) and for dissociative ionization, but not for H+ and D+ produced via direct dissociative excitation. Present DE cross sections for D2H+ are found to be significantly lower than those measured for D+3, although those of DI agree well together.

Electron-impact dissociation and ionization of NO⁺ions

Belić

Urbain

Cherkani-Hassani

et al. 2016

Absolute cross sections for electron-impact ionization and dissociation of NO+ ions are reported. Simple ionization to NO2+ ion and production of singly charged N+ and O+ and doubly charged N2+ and O2+ fragments have been investigated. The animated electron-ion crossed-beam method is applied in the energy range from the respective thresholds up to 2.5 keV. The maximum of the simple ionization cross section is found to be (3.49 ± 0.07) × 10−17 cm2 at 135 eV. The total cross sections for N+ and O+ fragments at the maximum are found to be (13.9 ± 1.0) × 10−17 cm2 and (14.0 ± 1.4) × 10−17 cm2, respectively, both at an energy of 85 eV. By performing careful magnetic field scans of the detected signal, contributions of dissociative excitation and dissociative ionization to N+ and O+ production are determined separately. The cross sections for asymmetric dissociative ionization to N2+ and O2+ are found to be over one order of magnitude smaller. Distributions of the kinetic energy release to the fragments are determined for all dissociation processes.