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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+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2007, LECOINTRE, Julien; Cherkani-Hassani, S.; Belic, D. S.; Jureta, J. J.; Becker, K.; Deutsch, H.; Märk, T. D.; Probst, M.; Janev, R. K.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact dissociative excitation and ionization of CD+ leading to the formation of ionic products (D+, C+, C2+ and C3+) are reported in the energy range from their respective thresholds to 2.5 keV. Around the maximum, cross sections are found to be (10.5 ± 1.0) × 10−17 cm2, (20.6 ± 3.5) × 10−17 cm2, (1.20 ± 0.11) × 10−17 cm2 and (8.2 ± 1.5) × 10−20 cm2 for D+, C+, ...
Water-molecule dissociation by proton and hydrogen impact![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2007, LECOINTRE, Julien; Luna, H.; de Barros, A. L. F.; Wyer, J. A.; Scully, S. W. J.; Garcia, P. M. Y.; Sigaud, G. M.; Santos, A. C. F.; Senthil, V.; Shah, M. B.; Latimer, C. J.; Montenegro, E. C.,
- HENALLUX
,
- Article scientifique
Article scientifique
Time-of-flight-based mass analysis of charged water fragments have been used to measure the dissociative
and the nondissociative reaction pathways of water formed during collisions with 15 to 100 keV and
500 to 3500 keV H+ projectiles and with 8 to 100 keV H0 projectiles. The fragmentation pathways resulting
from the ionization and the electron capture collisions with the incident H+ and H0 ...
Water Fragmentation and Energy Loss by Carbon Ions at the Distal Region of the Bragg Peak![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2007, LECOINTRE, Julien; Montenegro, E. C.; Shah, M. B.; Luna, H.; Scully, S. W. J.; de Barros, A. L. F.; Wyer, J. A.,
- HENALLUX
,
- Article scientifique
Article scientifique
Time-of-flight mass spectrometry was used to investigate fragmentation and energy transfer processes in water by C ions at the distal part of the Bragg peak. Measurements of the positive ion fragments from ionization, electron capture, electron loss, transfer-loss and loss-ionization channels have allowed us for the first time (a) to obtain a quantitative determination of the energy lost by C ions ...
Ionisation et dissociation par impact électronique d'ions moléculaires d'intérêt atmosphérique et thermonucléaire![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Livre/Ouvrage ou monographie
Dans les milieux ionisés existe un grand nombre d'espèces chimiques. Beaucoup sont en quantité minoritaire mais jouent pourtant, par leur grande réactivité, un rôle essentiel dans les processus de transformation chimique. Cette étude s'intéresse à la structure et à la dynamique des ions moléculaires, ainsi qu'aux collisions réactives pour des systèmes intervenant dans les atmosphères planétaires et ...
A crossed-beam experiment for electron impact ionization and dissociation of molecular ions: its application to CO+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2006, LECOINTRE, Julien; Belic, D. S.; Cherkani-Hassani, H.; Jureta, J. J.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
A crossed electron–ion beam experimental set-up has been upgraded for the study of electron impact ionization and dissociation of molecular ions by means of ionic product detection. Both the experimental set-up and the data analysis procedures are described in detail for the estimation of (i) absolute cross sections, (ii) kinetic energy release distributions (KERD) and (iii) anisotropies of angular ...
Absolute cross sections and kinetic energy release for doubly and triply charged fragments produced by electron impact on CO+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2006, LECOINTRE, Julien; Belic, D. S.; Jureta, J. J.; Becker, K.; Deutsch, H.; Limtrakul, J.; Märk, T. D.; Probst, M.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact ionization of CO+ leading to the formation of doubly and triply charged products (CO2+, C2+ and O2+, C3+ and O3+) are reported in the energy range from their respective thresholds to 2500 eV. Around the maximum, cross section values are found to be (13.36 ± 0.56) × 10−18 cm2, (5.58 ± 0.55) × 10−18 cm2 and (1.37 ± 0.14) × 10−18 cm2 for CO2+, C2+ and O2+, ...
Mass Spectrometric Investigation of Anions Formed upon Free Electron Attachment to Nucleobase Molecules and Clusters Embedded in Superfluid Helium Droplets![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2006, LECOINTRE, Julien; Denifl, S.; Zappa, F.; Mähr, I.; Probst, M.; Märk, T. D.; Scheier, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Here we report the first mass spectrometric study of negative ions formed via free electron attachment (EA) to nucleobases (NBs) embedded in helium clusters. Pure and mixed clusters of adenine and thymine have been formed by pickup of isolated NB molecules by cold helium droplets. In contrast to EA of isolated molecules in the gas phase we observe a long-lived parent anion NB− and, in addition, ...
Nuclear spin conversion in the gaseous phase in the presence of a static electric field: Intramolecular magnetic interactions and the role of collisions![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2004, LECOINTRE, Julien; Cacciani, P.; Cosléou, F.; Herlemont, F.; Khelkhal, M.,
- HENALLUX
,
- Article scientifique
Article scientifique
When a gaseous sample of 13CH3F is prepared with a spin-isomer population ratio (ortho and para forms) far from the equilibrium given by nuclear spin statistics, it relaxes towards this equilibrium with an exponential decay rate. This phenomenon, called nuclear spin conversion, is mainly governed by intramolecular spin-spin and spin-rotation interactions which couple two pairs of quasidegenerate ...
Rotational dependence of the dipole moment of 13CH3F![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2004, LECOINTRE, Julien; Cosleou, J.; Cacciani, P.; Herlemont, F.; Khelkhal, M; Pracna, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
When a gas sample of 13CH3F is prepared with a population of spin isomers far from the equilibrium given by nuclear spin statistics, it relaxes towards this equilibrium with an exponential decay rate. This rate is increased by submitting the molecules to a static electric field, emphasizing the role of the magnetic intramolecular interactions and of the collisions in the “quantum relaxation” process ...