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Julien LECOINTRE
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Electron impact dissociation of ND+: formation of D+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2011, LECOINTRE, Julien; Belic, D.S.; Cherkani-Hassani, S.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact dissociation of ND+ leading to the formation of D+ have been measured by applying the animated electron-ion beam method in the energy range from the reaction threshold up to 2.5 keV. The maximum inclusive cross section is observed to be (16.8 ± 0.8) × 10−17 cm2 at the electron energy of 65.1 eV. The appearance energy for the D+ production is measured to ...
Ionisation et dissociation d’ions moléculaires par impact électronique![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Livre/Ouvrage ou monographie
Les processus de collisions atomiques et moléculaires sont étudiés expérimentalement à Louvain-la-Neuve (UCL, Belgique). Les phénomènes considérés sont de première importance en physique des plasmas de fusion contrôlée. Le développement actuel du projet de réacteur nucléaire ITER (International Thermonuclear Experimental Reactor, Cadarache, France) implique spécialement un besoin toujours accru de ...
Spectroscopy and dynamics of the 7,7,8,8-tetracyanoquinodimethaneradical anion![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
The photoelectron spectrum of the 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion has
been measured at 3.1 eV. Additionally, the ultrafast relaxation dynamics of the first excited state
(12B3u) of TCNQ have been studied using time-resolved photoelectron spectroscopy, which
reveals that it undergoes internal conversion back to the ground state (2B2g) with an associated
lifetime of 650 fs ...
III. Electron-impact dissociative ionization of C2H +2 and C2D +2![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2010, LECOINTRE, Julien; Cherkani-Hassani, H.; Belic, D. S.; Jureta, J. J.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections for electron-impact dissociative ionization of C2 H +2 and C2 D +2 to CH+, C+, C +2 , H+, CH +2 and C2D+ fragments are determined for electron energies ranging from the corresponding threshold to 2.5 keV. Results obtained in a crossed beams experiment are analyzed to estimate the contribution of dissociative ionization to each fragment formation. The dissociative ionization ...
II. Electron-impact dissociative excitation of C2H +2 and C2D +2![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2010, LECOINTRE, Julien; Cherkani-Hassani, H.; Belic, D. S.; Jureta, J. J.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections for electron-impact dissociative excitation of C2H +2 and C2D +2 to C2D+, CH+, C+, C +2, H+ and CH +2 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 ...
Electron-impact dissociation and ionization of NH+: formation of N+ and N2+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Absolute cross sections for electron-impact dissociation and ionization of NH+ leading to the formation of N+ and N2+ products have been measured by applying the animated electron–ion beam method, in the energy range from the respective thresholds up to 2.5 keV. The maximum total cross sections are observed to be (15.7 ± 0.7) × 10−17 cm2 and (11.1 ± 0.2) × 10−18 cm2 for N+ and N2+, respectively. ...
Ultrafast Relaxation Dynamics Observed Through Time-Resolved Photoelectron Angular Distributions![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2010, LECOINTRE, Julien; Roberts, G.M.; Horke, D. A.; Verlet, J.R.R.,
- HENALLUX
,
- Article scientifique
Article scientifique
Time-resolved photoelectron imaging of the 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion is presented. Photoelectron angular distributions (PADs) are qualitatively analyzed in terms of the simple s-p model that is based on symmetry arguments. The internal conversion dynamics from the first excited state (12B3u) to the ground state (2B2g) may be observed through temporal changes in the PADs ...
I. Electron-impact ionization and dissociation of C2H +2 and C2D +2![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2010, LECOINTRE, Julien; Cherkani-Hassani, H.; Cherkani-Hassani, S.; Belic, D. S.; Jureta, J. J.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections for electron-impact ionization and dissociation of C2H +2 and C2D +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 ...
Electron-impact ionization and dissociation of C2D+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2010, LECOINTRE, Julien; Cherkani-Hassani, H.; Cherkani-Hassani, S.; Belic, D. S.; Jureta, J. J.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron-impact single ionization, dissociative excitation and dissociative ionization of the ethynyl radical ion (C2D+) have been measured for electron energies ranging from the corresponding reaction thresholds to 2.5 keV. The animated crossed electron-ion beam experiment is used and results have been obtained for the production of C2D2+, C2+, C+2, CD+, C+ and D+. The ...
Electron impact multiple ionization of argon ions![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Absolute cross sections for electron impact single and multiple ionization of argon ions
leading to the formation of Ar q + (q = 2–8) are reported. The animated crossed beam method
is applied in the energy range extending from the respective thresholds up to 2.5 keV. The
maximum cross sections for the multiply charged products Ar q + (q = 2–8) are measured to be
(12.6 ± 0.6) × 10−17 cm2 for Ar2+, ...
Toward real-time charged-particle image reconstruction using polar onion-peeling![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2009, LECOINTRE, Julien; Roberts, G. M.; Nixon, J. L.; Wrede, E.; Verlet, J. R. R.,
- HENALLUX
,
- Article scientifique
Article scientifique
A method to reconstruct full three-dimensional photofragment distributions from their two-dimensional (2D) projection onto a detection plane is presented, for processes in which the expanding Newton sphere has cylindrical symmetry around an axis parallel to the projection plane. The method is based on: (1) onion-peeling in polar coordinates [Zhao et al., Rev. Sci. Instrum. 73, 3044 (2002)] in which ...
Absolute cross-sections and kinetic-energy-release distributions for electron-impact ionization and dissociation of CD +3![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2009, LECOINTRE, Julien; Belic, D. S.; Jureta, J. J.; Janev, R. K.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections have been measured for electron-impact dissociative excitation and ionization of CD+3/(CH+3) leading to formation of singly-charged fragments (CD +2, CH+, C+, H +2 and D+). The animated crossed-beams method is applied in the energy range from the reaction threshold up to 2.5 keV. The maximum cross-sections are found to be (14.0±1.0)×10-17 cm2, (6.5± 0.7)×10-17 cm2, (3.3± ...
Absolute cross-sections and kinetic energy release distributions for electron-impact dissociation of D3+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2009, LECOINTRE, Julien; Abdellahi El Ghazaly, M. O.; Jureta, J. J.; Belic, D. S.; Urbain, X.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections for electron-impact dissociation of D+3 leading to the formation of D+ and D+2 products have been measured by applying the animated electron-ion beam method in the energy range from the respective thresholds up to 2.5 keV. The maximum total cross-sections are observed to be (13.9 ± 1.1) × 10−17 cm2 and (8.2 ± 0.1) × 10−17 cm2 (around 50 eV) for D+ and for D+2 fragments, ...
Energy distributions of H+ fragments ejected by fast proton and electron projectiles in collision with H2O molecules![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2009, LECOINTRE, Julien; de Barros, A. L. F.; Luna, H.; Shah, M. B.; Montenegro, E. C.,
- HENALLUX
,
- Article scientifique
Article scientifique
Experimental measurements of the kinetic energy distribution spectra of
H
+
fragment ions released during radiolysis of water molecules in collision with 20, 50, and 100 keV proton projectiles and 35, 200, 400, and 1000 eV electron projectiles are reported using a pulsed beam and drift tube time-of-flight based velocity measuring technique. The spectra show that
H
+
fragments carrying a ...
Dissociative excitation of NeD+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2009, LECOINTRE, Julien; Ngassam, V.; Jureta, J.J.; Mitchell, J. B. A.; Orel, A. E.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Measurements of NeD+ dissociative excitation cross section were obtained in Louvain-la-Neuve (UCL, Belgium) by using the animated crossed electron-ion beam method. The electronic structure of the system was calculated by using quantum chemistry calculations for the NeD+ ion and ab initio electron scattering calculations using the complex Kohn variational method for the resonant NeD neutral complex ...
Absolute cross sections and kinetic energy release distributions for electron-impact ionization and dissociation of CD+ 4![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2008, LECOINTRE, Julien; Belic, D. S.; Jureta, J. J.; Janev, R. K.; Defrance, P.,
- HENALLUX
,
- 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![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2008, LECOINTRE, Julien; Defrance, P.; Jureta, J.J.; Kereselidze, T.; Machavariani, Z.S.,
- HENALLUX
,
- Article scientifique
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+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2008, LECOINTRE, Julien; Jureta, J.J.; Mitchell, J. B. A.; Ngassam, V.; Orel, A. E.; Defrance, P.,
- HENALLUX
,
- Article scientifique
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![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
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![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2007, LECOINTRE, Julien; Zappa, F.; Denifl, S.; Mähr, I.; Rondino, F.; Echt, O.; Märk, T.D.; Scheier, P.,
- HENALLUX
,
- Article scientifique
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 ...