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Julien LECOINTRE
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Absolute cross sections and kinetic energy release distributions for electron-impact ionization and dissociation of CD+ 4
2008, LECOINTRE, Julien; Belic, D. S.; Jureta, J. J.; Janev, R. K.; Defrance, P.,
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- Article scientifique
Article scientifique
Absolute cross sections for electron-impact dissociative excitation and ionization of CD+ 4 leading to formation of ionic products (CD2+ 4, CD+ 3, CD+ 2, CD+, C+, D+ 3, D+ 2, and D+) have been measured. The animated crossed-beams method is applied in the energy range from the reaction threshold up to 2.5 keV. Around 100 eV, the maximum cross sections are found to be (3.8±0.2) ×10-19 cm2, (10.8±1.5)× ...
Screening effects and total cross sections of single, double and triple ionization of neon by fast electrons
2008, LECOINTRE, Julien; Defrance, P.; Jureta, J.J.; Kereselidze, T.; Machavariani, Z.S.,
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Article scientifique
The Bethe–Born theory is applied to estimate the effective charges experienced by the ejected electrons at single, double and triple ionization of neon by fast electrons. The expansion coefficients appearing in the asymptotic expressions for total cross sections σn+ ~ [an+ln(Ei/In+) + bn+]/Ei are determined by fitting to these expressions the experimental data for single and multiple ionization of ...
Absolute cross sections and kinetic energy release distributions for electron-impact dissociative excitation and ionization of NeD+
2008, LECOINTRE, Julien; Jureta, J.J.; Mitchell, J. B. A.; Ngassam, V.; Orel, A. E.; Defrance, P.,
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Article scientifique
Absolute cross sections for electron impact dissociative excitation and ionization of NeD+ leading to the formation of singly and multiply charged products (D+, Ne+, Ne2+ and Ne3+) are reported, in the energy range from their respective thresholds to 2.5 keV. The animated crossed-beams method is used. For singly charged fragments, absolute cross sections are obtained separately for dissociative ...
Electron-impact ionization of singly-charged neon ions
Article scientifique
Absolute cross sections for electron-impact single and multiple ionization of Ne+ leading to the formation of Neq+ (q = 2–5) are reported. The animated crossed beams method is applied in the energy range from the respective thresholds up to 2.5 keV. The maximum cross sections are found to be (4.12 ± 0.21) × 10−17 cm2, (1.42 ± 0.07) × 1018 cm2, (2.57 ± 0.14) × 10−20 cm2, (8.78 ± 0.54) × 10−22 cm2 for ...
Electron impact ionization of thymine clusters embedded in superfluid helium droplets
2007, LECOINTRE, Julien; Zappa, F.; Denifl, S.; Mähr, I.; Rondino, F.; Echt, O.; Märk, T.D.; Scheier, P.,
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Article scientifique
Embedding molecules in helium clusters has become a powerful technique for the preparation of cold targets for spectroscopy experiments, as well as for the assembly of complex, fragile molecular species. We have recently developed a helium cluster source and a pick-up cell to produce neutral beams of doped helium droplets, to be used as targets in studies on electron collisions with molecules of ...