A5055414966- Nuclear Materials and Properties
- Fusion materials and technologies
- Muon and positron interactions and applications
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Radioactive element chemistry and processing
- Nuclear reactor physics and engineering
- Silicon Carbide Semiconductor Technologies
- Nuclear materials and radiation effects
- Metal and Thin Film Mechanics
- Advanced Materials Characterization Techniques
- Copper Interconnects and Reliability
- Nuclear Physics and Applications
- Diamond and Carbon-based Materials Research
- Silicon and Solar Cell Technologies
- Advanced ceramic materials synthesis
- Advanced materials and composites
- nanoparticles nucleation surface interactions
- Semiconductor materials and interfaces
- Ammonia Synthesis and Nitrogen Reduction
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Radioactive contamination and transfer
- Particle accelerators and beam dynamics
- Surfactants and Colloidal Systems
Centre National de la Recherche Scientifique
2014-2024
Conditions Extrêmes et Matériaux Haute Température et Irradiation
2015-2024
Université d'Orléans
2012-2023
Centre de Gestion Scientifique
2013
Universität der Bundeswehr München
2009
RIKEN
2008
École Polytechnique
2007-2008
ETH Zurich
2008
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement
2008
Institut de Recherche sur les Lois Fondamentales de l'Univers
2008
We report the realization of a quantum circuit in which an ensemble electronic spins is coupled to frequency tunable superconducting resonator. The are nitrogen-vacancy centers diamond crystal. achievement strong coupling manifested by appearance vacuum Rabi splitting transmission spectrum resonator when its tuned through center electron spin resonance.
This study provides a critical analysis on the use of diffuse reflectance spectroscopy and Tauc equation to estimate optical energy bandgap semiconductor/carbon composites amorphous porous carbons. Determination gap from is strongly dependent analyst's experience, due uncertainties related establish adequate range fit experimental data equation, identify type electronic transitions. Furthermore, its application strong light absorbing or multiphase materials with several components not...
The reemission yield of ortho-positronium (o-Ps) into vacuum outside mesoporous silica films on glass is measured in reflection mode with a specially designed lifetime (LT) spectrometer. Values as high 40% are found. intensity the 142ns LT recorded function depth. depth profiling correlated to 2γ and 3γ energy ones determine annihilation characteristics inside films. Positron capped used pore size. For first time, set consistent fingerprints for positronium annihilation, o-Ps vacuum, size,...
We studied the parameters to optimize production of negatively-charged nitrogen-vacancy color centers (NV-) in type~1b single crystal diamond using proton irradiation followed by thermal annealing under vacuum. Several samples were treated different and conditions characterized slow positron beam Doppler-broadening photoluminescence (PL) spectroscopies. At high fluences another complex vacancy defect appears limiting formation NV-. Concentrations as 2.3 x 10^18 cm^-3 NV- have been estimated...
Fusion fuel retention (trapping) and release (desorption) from plasma-facing components are critical issues for ITER any future industrial demonstration reactors such as DEMO. Therefore, understanding the fundamental mechanisms behind of hydrogen isotopes in first wall divertor materials is necessary. We developed an approach that couples dedicated experimental studies with modelling at all relevant scales, microscopic elementary steps to macroscopic observables, order build a reliable...
Abstract Surface and near-surface morphology evolution of helium-irradiated tungsten due to thermal cycling up the ITER-relevant temperature 1350 K was studied using electron microscopy positron annihilation spectroscopy techniques. Holes at surface bubbles in recrystallized polycrystalline samples were created by 75 eV helium plasma irradiation with fluence 3 × 10 23 He m −2 1073 K. Subsequent annealing experiments combined a detailed analysis investigate shape density changes holes respect...
Abstract Positron Annihilation Lifetime Spectroscopy has been performed with a pulsed positron beam to investigate the nature and evolution of implantation‐induced defects created in track region (TR) 800 keV 3 He ions at different fluences. At high fluence ‐ 5×10 16 cm –2 lifetime decomposition exhibits predominant (98%) 200 ps which is attributed irradiation induced monovacancy. The increasing average as function post‐implantation annealing temperature allowed identify vacancy clustering...
In situ Raman scattering studies allow following real‐time evolutions of volume or surface structures under extreme conditions. nuclear materials sciences, ion irradiation‐induced atomic organization modification and water radiolysis are a major interest. order to better understand these phenomena, we have developed an in versatile portable spectroscopy system coupled with cyclotron accelerator, allowing monitoring solid/liquid interface irradiation thus giving access effects radiolysis. The...
Combining electron paramagnetic resonance, density functional theory, and positron annihilation spectroscopy (PAS), we identify the nitrogen interstitial defect in GaN. The isolated is unstable transforms into a split configuration $(\mathrm{N}\mathrm{\text{\ensuremath{-}}}\mathrm{N}{)}_{\mathrm{N}}$. It generated by particle irradiation with an introduction rate of primary defect, pins Fermi level at ${E}_{C}\ensuremath{-}1.0\text{ }\text{ }\mathrm{eV}$ for high fluences, anneals out...
Self-ion irradiation of pure tungsten with 2 MeV W ions provides a way simulating microstructures generated by neutron in components fusion reactor. Transmission electron microscopy (TEM) has been used to characterize defects formed samples ion irradiation. It was found that irradiated 0.85 dpa at relatively low temperatures develops characteristic microstructure dominated dislocation loops and black dots. The density size distribution these were estimated. Some the exposed self-ion then...
Tungsten is considered to be used in the future fusion reactors as plasma-facing material. In such extreme environments, defects are induced materials that modify their macroscopic properties mechanical ones. It of paramount importance able determine concentration and size vacancy defects, from mono large cavities, validate models developed predict evolution microstructure irradiated materials. Positrons very useful non-destructive probes can characterize vacancy-type We present a combined...
The intrinsic defects in p-type $6H\ensuremath{-}\mathrm{S}\mathrm{i}\mathrm{C}:\mathrm{A}\mathrm{l}$ generated by electron irradiation at 300 keV, which is close to the threshold of silicon atom displacement, have been studied paramagnetic resonance spectroscopy. We observed two dominant irradiation-induced defects: (i) a silicon-vacancy-related spin $S=3/2$ defect with zero-field splitting...
Depth profiling of positron annihilation characteristics has been used to investigate the pore size distribution in macroporous PMMA latex-templated SiO2 films deposited on glass or Si and prepared with 11–70% porosity. The correlation between shows that ortho-positronium (o-Ps) escape (re-emission) into vacuum occurs all a porosity threshold is dependent. For 60 ± 2% porosity, o-Ps re-emission yield decreases from ∼0.25 ∼0.11 as increases 32 75 nm. shown vary linearly specific surface area...