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Julien LECOINTRE
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Voici les éléments 11-20 de 49
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Electron-impact dissociation of HeH+: absolute cross sections for the production of Heq+ (q = 1–2) fragments![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Absolute cross sections have been measured for electron-impact dissociative excitation and ionization of the helium-hydride ion (HeH+) leading to the formation of helium ions Heq+ (q = 1–2). Measurements have been performed for electron energies ranging from the respective thresholds up to 2.5 keV. For He+ production, the maximum absolute cross section for dissociative excitation is found to be (2.5 ...
CRP on Atomic and Molecular Data for Plasma Modelling Volume 16![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
This publication, arising from a Coordinated Research Project on Atomic and Molecular Data for Plasma Modelling, provides information on new data relevant to the edge region of plasmas in nuclear fusion energy devices. In this region, molecules and molecular ions are formed and react with electrons and with each other and fusion plasma modelling requires cross-sections and rate coefficients for such ...
Influence d’un film viscoélastique ultra-mince sur la réponse d’une pointe oscillante : vers un aspect quantitatif du mode semi contact d’un microscope à force atomique![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Le microscope atomique est un type de microscope à sonde locale
permettant de visualiser la topographie de la surface d'un échantillon. Le
mode semi contact consiste à faire vibrer une pointe à sa fréquence propre
de résonance avec une certaine amplitude. La rétroaction se fait alors sur
l'amplitude d'oscillation du levier suite à l’interaction de la pointe avec la
surface. Un modèle a été ...
Étude et modélisation du maintien horizontal de l'assiette d'un véhicule tout-terrain pour personnes à mobilité réduite![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Cet article traite de l'étude et la modélisation d'un système permettant de
maintenir horizontalement un plateau disposé sur un véhicule tout-terrain et
destiné au transport de personnes à mobilité réduite.
Les étapes de l'étude sont : une analyse fonctionnelle, une modélisation
mathématique du véhicule, la caractérisation et le choix des éléments du
système de stabilisation du plateau et une ...
Velocity-map imaging at low extraction fields![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2012, LECOINTRE, Julien; Horke, D. A.; Roberts, G. M.; Verlet, J. R. R.,
- HENALLUX
,
- Article scientifique
Article scientifique
We present a velocity-map imaging (VMI) setup for photoelectron imaging that utilizes low electric extraction fields. This avoids any complications that could arise from electrostatic interactions between the extraction field and the molecular properties that are probed and has a minimal effect on the trajectory of ions in ion beam experiments. By using an attractive potential supplied to the detector, ...
Electron-impact dissociation and ionization of OH+ and OD+ ions![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2012, LECOINTRE, Julien; Belic, D. S.; Jureta, J. J.; Cherkani-Hassani, H.; Cherkani-Hassani, S.; Defrance, P.,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact ionization and dissociation of OH+ and OD+ leading
to the formation of the OH2+, O+, O2+, O3+ and D+ ions have been measured by applying the animated
electron-ion beam method in the energy range from the respective reaction thresholds up to 2.5 keV. The
maximum of the single ionization cross section is found to be (0.95±0.02) × 10−19 cm2 at 155 eV. ...
Isotope effects in electron-impact dissociation of D2H+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
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) ...
Electron-impact ionization of atomic hydrogen: dynamical variational treatment![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
2011, LECOINTRE, Julien; Defrance, P.; Kereselidze, T.; Machavariani, Z.S.,
- HENALLUX
,
- Article scientifique
Article scientifique
A simple and straightforward calculating scheme is proposed for electron-impact single and multiple ionization of atoms. The method is based on the application of the Hulthén-Kohn dynamical variational principle. An effective charge seen by the scattered electron is determined for a certain type of trial wave functions mathematically in a rigorous way excluding any empirical assumptions. Validity ...
Electron impact dissociation of ND+: formation of D+![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
Nitrogen is a common contaminant species in fusion reactors
such as the ITER (International Thermonuclear Experimental
Reactor). Thus, the collisional properties of nitrogen-containing
plasma compounds arewidely studiedexperimentally andtheoretically.
Here we show the results of absolute cross section
measurements for the electron impact dissociative excitation of
ND+ yielding D+, especially ...
Rovibrational analysis of the XUV photodissociation of HeH + ions![Peer reviewed Peer reviewed](/themes/Mirage2//images/peer_review.svg)
Article scientifique
We investigate the dynamics of the photodissociation of the helium hydride ion HeH+ by XUV radiation with the aim to establish a detailed comparison with a recent experimental work carried out at the FLASH free electron laser using both vibrationally hot and cold ions. We determine the corresponding rovibrational distributions using a dissociative charge transfer setup and the same source conditions ...