A5053552788- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Laser-induced spectroscopy and plasma
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear physics research studies
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Radiation Therapy and Dosimetry
- Spectroscopy and Laser Applications
- Diamond and Carbon-based Materials Research
- Crystallography and Radiation Phenomena
- Photorefractive and Nonlinear Optics
- Fullerene Chemistry and Applications
- Photocathodes and Microchannel Plates
- Laser-Plasma Interactions and Diagnostics
- Rare-earth and actinide compounds
- Solid State Laser Technologies
Centre de Recherche sur les Ions, les Matériaux et la Photonique
2014-2025
Normandie Université
2016-2025
Université de Caen Normandie
2008-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2023
Centre National de la Recherche Scientifique
2013-2023
École Nationale Supérieure d'Ingénieurs de Caen
2013-2023
Indian Institute of Technology Delhi
2022
Lawrence Berkeley National Laboratory
2022
University of Delhi
2022
Tokyo Metropolitan University
2022
Cross sections for electron emission in the energy range from $2--300\mathrm{eV}$ were measured $60\mathrm{MeV}/u$ ${\mathrm{Kr}}^{34+}$ ions impacting on ${\mathrm{H}}_{2}$. Model calculations are introduced to guide search interference effects spectra produced by coherent of electrons two H atoms analogy with Young's two-slit experiment. Experimentally, a full sinusoidal-like oscillation was observed up $250\mathrm{eV}$ good agreement calculations. The oscillatory structure is found be...
We demonstrate the use of a multiparticle coincidence technique to image diffraction an electron wave whose source is placed at specific site in free molecule. Core-level photoelectrons are used illuminate molecule from within. By measuring vector momenta two molecular fragments and photoelectron, richly structured pattern obtained body-fixed frame randomly oriented gas phase. illustrate this for CO, creating photoelectron C(1s) shell scanning its energy zero 30 eV.
We have used COLTRIMS to measure the angular distribution of electrons released from K-shell N2 and carbon CO by absorption one linear polarized photon. For each ionization event which leads two charged fragments we determine angle photoelectron with respect fragment ion momenta. In addition charge state energy molecular fragments. find a breakdown axial recoil approximation for kinetic releases below 10.2 eV, whereas that is found be valid all energies. Furthermore, emission spectrum same...
Single and double ionization of helium by 1 GeV/nucleon ${\mathrm{U}}^{92+}$ impact was explored in a kinematically complete experiment. The relativistic ion generates subattosecond ( ${10}^{\ensuremath{-}18}\mathrm{s}$) superintense $I>{10}^{19}\mathrm{W}/{\mathrm{cm}}^{2}$) electromagnetic pulse, which is interpreted as field equivalent photons (Weizs\"acker-Williams method). Cross sections, the emission characteristics ions electrons well momentum balances, are quantitatively discussed...
The fragmentation of the CO molecule by O7+ion impact is investigated in two different energy regimes fragment ion momentum spectroscopy. improved resolution present kinetic release measurement together with application a time-dependent wavepacket dynamics method used conjunction new high-level computations large number dication potential curves enables one to unambiguously assign each line an excited state transient molecular produced during collision. This first direct experimental...
We measured kinetic energies of the fragment ions argon dimers multiply ionized by low-energy Ar(9+) collisions. For (Ar2)(4+) dissociation, asymmetric channel (Ar(3+) + Ar(+)) yield is found unexpectedly higher than symmetric (Ar(2+) Ar(2+)) in contrast with previous observation for covalent molecules or clusters. dissociation (Ar2)(2+)→Ar(+) Ar(+), two well-separated peaks were observed, clearly evidencing that direct Coulombic and radiative charge transfer followed ionic alternatively...
The electron shakeoff probability of $^{6}\mathrm{Li}^{2+}$ ions resulting from the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay $^{6}\mathrm{He}^{+}$ has been measured with high precision using a specially designed recoil ion spectrometer. This is first measurement pure following nuclear $\ensuremath{\beta}$ decay, not affected by multielectron processes such as Auger cascades. In this ideal textbook case for application sudden approximation, experimental ionization was found to be...
We have studied the fragmentation of water vapour molecules induced by collision with a beam at 6.7 MeV/u. From measurement fragment time flight, we show that amount due to multiple ionization is very large. In case single ionization, are able reproduce accurately experimental cross sections calculating for each molecular level single-ionization section in framework CDW-EIS theory and diagram dissociation modified respect obtained dipolar ionization. By using qualitative arguments based on...
Angle- and energy-dependent cross sections for electron emission were measured 68-MeV/u ${\mathrm{Kr}}^{33+}$ ions impacting on ${\mathrm{H}}_{2}.$ These results show, in accordance with our earlier observation, that interference effects are produced by the coherent of electrons from two H atoms, analogy Young's two-slit experiment. Furthermore, present demonstrate observed oscillatory pattern varies observation angle, contrary to expectations but agreement recent theoretical predictions.
Recoil ion momentum spectroscopy has been applied to study low energy, state-selective single electron capture by highly charged projectiles. The specific systems investigated are fully stripped 6.82 keV/u ${\mathrm{Ne}}^{10+}$ and 6.75 ${\mathrm{Ar}}^{18+}$ on He. Measurements of the ${\mathrm{He}}^{+}$ recoil longitudinal momenta used determine final n-state dependence captured electron. Simultaneous measurement transverse yields information about impact parameter reaction window for capture.
We investigate the contribution of interatomic Coulombic decay induced by ion impact in neon and argon dimers (Ne${}_{2}$ Ar${}_{2}$) to production low-energy electrons. Our experiments cover a broad range perturbation strengths reaction channels. use 11.37 MeV/u S${}^{14+}$, 0.125 He${}^{1+}$, 0.1625 0.150 He${}^{2+}$ as projectiles study ionization, single double electron transfer projectile, well projectile loss processes. The application COLTRIMS microscope enables us retrieve...
We provide the experimental evidence that single electron capture process in slow collisions between ${\mathrm{O}}^{3+}$ ions and neon dimer targets leads to an unexpected production of low-energy electrons. This results from interatomic Coulombic decay process, subsequent inner-shell one site dimer. Although pure one-electron inner shell is expected be negligible low collision energy regime investigated here, due this overtakes by 1 order magnitude emission Auger electrons scattered...
A clear experimental signature of the population lowest triplet state <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>T</a:mi><a:mn>1</a:mn><a:none/><a:mprescripts/><a:none/><a:mn>3</a:mn></a:mmultiscripts></a:math> methane dication is identified in a photoionization experiment. This populated only valence ionization and absent when formed by core followed Auger-Meitner decay. For ionization, total internal energy <b:math...
We have performed a kinematically complete experiment and calculations on single ionization in 100 MeV/amu C6+ + He collisions. For electrons ejected into the scattering plane (defined by initial final projectile momentum vectors) our first- higher-order are good agreement with data. In perpendicular to containing axis strong forward-backward asymmetry is observed. this both first-order do not provide neither data nor amongst each other.
Interference structures associated with the emission of electrons from ${\mathrm{H}}_{2}$ by fast ${\mathrm{Kr}}^{33+}$ ions $(v/c=0.3)$ are found to exhibit oscillations second order superimposed on main oscillatory structure. The secondary occur about twice frequency oscillations. While primary structure is produced coherent two atomic centers, similar Young's two-slit experiment, our theoretical analysis indicates that doubling a second-order effect, where electron wave emitted at one...
We have measured the transmission of 230-keV (10-keV/$q$) Xe${}^{23+}$ ions through insulating tapered glass capillaries microscopic dimensions. The dynamics charging and discharging processes been investigated, evidencing an unexpected slow alignment beam along capillary axis. Oscillations exiting position observed during process associated to formation charge patches on inner walls. emerging are guided with a characteristic guiding angle falling universal curve proposed for PET polymer...
We have measured electron yields from the beam entrance and exit surfaces of thin carbon foils (d\ensuremath{\approxeq}4--700 \ensuremath{\mu}g/${\mathrm{cm}}^{2}$) bombarded with swift (13.6 MeV/u) highly charged (q=16--18) argon ions. The dependence on target thickness charge state ions is analyzed within framework an extended semiempirical model. Due to high velocity ions, it possible distinguish production in primary ionization (related stopping power effective ions) secondary due...
A coincident time of flight technique is used to investigate fast ion-induced CO molecule fragmentation with swift and multicharged heavy ions. The results concern the strong interaction regime for which no data have yet been reported. Kinetic energy release distributions, branching ratios multi-electron removal cross sections are determined each dissociation channel ions (Q = 2-9). general trend, from perturbative regime, analysed in light recent ion-atom advances. use recoil ion momentum...
Due to the strong evolution in field of nanotechnologies and continuous miniaturisation electronic components, multiply-charged ion nanobeams would be a promising tool this research. Either for surface modification or local (nanometre scale) analysis purposes, studying feasibility such beams is interest. In present contribution, we focusing technique based on self-organised charge-up simple glass 'funnel'.
Fast radiative cooling of anthracene cations ${({\mathrm{C}}_{14}{\mathrm{H}}_{10})}^{+}$ is studied with a compact electrostatic storage device, the Mini-Ring. The time evolution internal energy distribution stored ions probed in range from 3 to 7 ms using laser-induced dissociation 3.49-eV photons. population decay rate due emission measured vary 25 $450\phantom{\rule{0.16em}{0ex}}{\mathrm{s}}^{--1}$ as function excitation 6 7.4 eV. After corrections infrared effect via vibrational...