A5047053729- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Cold Atom Physics and Bose-Einstein Condensates
- Electron and X-Ray Spectroscopy Techniques
- Astrophysics and Star Formation Studies
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Quantum Mechanics and Applications
- Fullerene Chemistry and Applications
- Plasma Diagnostics and Applications
- Spectroscopy and Quantum Chemical Studies
- Astro and Planetary Science
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Molecular Junctions and Nanostructures
- Laser-Matter Interactions and Applications
- Dust and Plasma Wave Phenomena
- Analytical Chemistry and Sensors
- Ocular and Laser Science Research
Centre de Recherche sur les Ions, les Matériaux et la Photonique
2013-2025
Centre National de la Recherche Scientifique
2012-2025
Université de Caen Normandie
2012-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2025
École Nationale Supérieure d'Ingénieurs de Caen
2012-2025
Normandie Université
2018-2023
HUN-REN Institute for Nuclear Research
2008
Helmholtz-Zentrum Berlin für Materialien und Energie
1998-2001
Western Michigan University
2001
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
1997-2001
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...
Gas-phase near-edge X-ray absorption mass spectrometry (NEXAMS) was employed at the carbon and oxygen K-edges to probe influence of a single water molecule on protonated phosphotyrosine molecule. The results photodissociation experiments revealed that forms two bonds, with phosphate group another chemical group. By comparing NEXAMS spectra density functional theory calculations, we attributed electronic transitions responsible for observed resonances, especially due presence We showed leads...
We report highly selective covalent bond modifications in collisions between keV alpha particles and van der Waals clusters of ${\mathrm{C}}_{60}$ fullerenes. Surprisingly, $\mathrm{C}_{119}{}^{+}$ $\mathrm{C}_{118}{}^{+}$ are the dominant molecular fusion products. use dynamics simulations to show that $\mathrm{C}_{59}{}^{+}$ $\mathrm{C}_{58}{}^{+}$ ions---effectively produced prompt knockout processes with ${\mathrm{He}}^{2+}$---react rapidly form dumbbell $\mathrm{C}_{118}{}^{+}$. Ion...
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...
Abstract In general, radiation‐induced fragmentation of small amino acids is governed by the cleavage CC α bond. We present results obtained with 300 keV Xe 20+ ions that allow molecules (glycine and valine) to be ionised at large distances without appreciable energy transfer. Also in case, bond turns out weakest link hence its scission dominant channel. Intact are observed very low intensities. When embedded a cluster acids, protective effect environment observed. The pattern changes:...
The Cover Feature illustrates a study on hydrated phosphotyrosine in the gas phase. In their Research Article (DOI: 10.1002/chem.202403665), J. Leroux, S. Bari and co-workers explain how, by combining synchrotron radiation tuned to oxygen core—shell energy with tandem mass spectrometry, they identified most favorable position adopted single water molecule protonated amino acid. Their integrated experimental theoretical approach revealed that bridges phosphate carboxyl groups, effectively...
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.
Interference patterns due to the coherent electron emission from atomic centers of a ${D}_{2}$ molecule by fast impact are experimentally observed in doubly differential cross sections. This behavior is supported theoretical predictions. Measurements given for $2.4\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ electrons. The emitted electrons detected energy range $2\phantom{\rule{0.5em}{0ex}}\text{to}\phantom{\rule{0.5em}{0ex}}2000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, at observation angles...
We report on an experimental study of the ionization and fragmentation clusters $k$ polycyclic aromatic hydrocarbon (PAH) molecules using anthracene, C${}_{14}$H${}_{10}$, or coronene, C${}_{24}$H${}_{12}$. These PAH are moderately charged strongly heated in small impact parameter collisions with 22.5-keV He${}^{2+}$ ions, after which they mostly decay long monomer evaporation sequences singly comparatively cold monomers as dominating end products. describe a simple cluster model estimate...
Abstract Fragmentation of the γ‐aminobutyric acid molecule (GABA, NH 2 (CH ) 3 COOH) following collisions with slow O 6+ ions ( v ≈0.3 a.u.) was studied in gas phase by a combined experimental and theoretical approach. In experiments, multicoincidence detection method used to deduce charge state GABA before fragmentation. This is essential unambiguously unravel different fragmentation pathways. It found that molecular cations resulting from hardly survive interaction main dissociation...
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 report experimental results for the ionization and fragmentation of weakly bound van der Waals clusters n C60 molecules following collisions with Ar2 +, He2 Xe20 + at laboratory kinetic energies 13 keV, 22.5 300 respectively. Intact singly charged monomers are dominant reaction products in all three cases this is accounted by means Monte Carlo calculations energy transfer processes a simple Arrhenius-type \documentclass[12pt]{minimal}\begin{document}$[{\rm...
We have observed significant differences in the fragmentation patterns of isomeric Polycyclic Aromatic Hydrocarbon (PAH) cations following collisions with helium atoms at center-of-mass energies around 100 eV. This is contrast to situation other collision or photo-absorption experiments where effects are very weak and lowest-energy dissociation channels (H- C2H2-loss) dominate statistical processes. In eV range, non-statistical also competes uniquely linked losses single carbon (CHx-losses)....
We measured the energy and angular distribution of fragment ions from collisions 2–90 keV Neq+ (q = 1, 3, 5, 7 9) with H2O molecules. A strong dependence on charge state incident ion was observed. The results are interpreted within framework a Coulomb explosion model. Deviations this model in recoil attributed to post-collision effects by electric field projectile. Absolute cross sections for production were found be consistent calculated using classical over-barrier
Evidence is given for Young-type interferences caused by a single electron acting on double-center scatterer analogous to an atomic-size double-slit system. The provided autoionization of doubly excited He atom following the capture electrons ${\mathrm{H}}_{2}$ ${\mathrm{He}}^{2+}$ incoming ion. autoionizing projectile single-electron source, independent interferometer two ${\mathrm{H}}^{+}$ centers fully ionized molecule. This experiment resembles famous thought imagined Feynman in 1963,...
Double- $K$-shell-vacancy production in Li by $95\mathrm{MeV}/\mathrm{nucleon}{\mathrm{Ar}}^{18+}$ projectiles was investigated using high-resolution electron spectroscopy. The two $K$ vacancies are found to come about mainly ionization and excitation, giving rise excited states hollow $\mathrm{Li}{}^{+}$. Strong line intensities from the ${2s}^{2}^{1}S$ $2s3s^{3}S$ configurations provide spectral identification for electron-electron interaction. Production of state, with an intensity...
Detailed analyses of previous measurements, combined with additional measurements reported here, have been made electron interference structures observed in $60\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}∕\mathrm{u}$ ${\mathrm{Kr}}^{34+}+{\mathrm{H}}_{2}$ collisions. Results are used to characterize the angular dependence primary over a wide range ejection angles, particularly backward and, additionally, search for high-frequency as recently...
We have studied collisions between 22.5 keV ${\mathrm{He}}^{2+}$ ions and mixed clusters $[({\mathrm{C}}_{60}){}_{m}({\mathrm{C}}_{24}$${\mathrm{H}}_{12}){}_{n}]$ of $m$ ${\mathrm{C}}_{60}$ $n$ coronene molecules where range up to about ten. Surprisingly, the cluster fragmentation behavior in distant is dramatically different for pure ($m=0$) containing a single molecule $(m=1)$. In latter case, may be ionized without also being fragmented on experimental time scale tens microseconds. This...
The method of projectile electron spectroscopy was used to measure the ${\mathrm{Ne}}^{8+}$ Auger decay configurations 3lnl\ensuremath{'} and 4lnl\ensuremath{'} (n\ensuremath{\geqslant}4) created by double capture in 150-keV ${\mathrm{Ne}}^{10+}$+He collisions. yields were evaluated convert experimental cross sections for Auger-electron emission into corresponding capture. It is found that attributed follow a ${\mathrm{n}}^{\mathrm{\ensuremath{-}}3}$ law, while excitation rather selective...
Cross sections for single electron emission have been measured in collisions of $95\mathrm{MeV}/\mathrm{u}{\mathrm{Ar}}^{18+}$ with atomic Li energies 5--1000 eV and angles 25\ifmmode^\circ\else\textdegree\fi{}--155\ifmmode^\circ\else\textdegree\fi{}. The high projectile velocity made possible the separation two- three-body processes angular distributions ejected electrons. Low-energy $2s$ electrons is found to be significantly influenced by two-body effects and, furthermore, node wave...
The energy distributions of H+fragments produced in 345 keV Xe23+ + H2and 75 O5+ H2collisions have been investigated experimentally as a function the detection angle. For both systems, experiment shows strong deviations from molecular Coulomb explosion. Two- and three-body model calculations also performed to understand spectra. In collisions involving heaviest projectile , two-body reproduce experimental data satisfactorily, indicating that recoil transferred target plays an important role...
Distributions of ejected electrons following collisions slow ${\mathrm{He}}^{+}$ and ${\mathrm{He}}^{2+}$ ions a He target were measured for projectile energies 20 40 keV, respectively. The detected at angles 30\ifmmode^\circ\else\textdegree\fi{} 90\ifmmode^\circ\else\textdegree\fi{} with respect to the incident beam direction. Superimposed on continuous background originating from ionization, small amplitude, high-frequency oscillations are revealed. frequency these is found be nearly...