A5029791687- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Laser-induced spectroscopy and plasma
- Nuclear reactor physics and engineering
- High-Energy Particle Collisions Research
- Spectroscopy and Quantum Chemical Studies
- Quantum Chromodynamics and Particle Interactions
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- Cold Atom Physics and Bose-Einstein Condensates
- Perovskite Materials and Applications
- Mass Spectrometry Techniques and Applications
- Laser-Matter Interactions and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- nanoparticles nucleation surface interactions
- Advanced Physical and Chemical Molecular Interactions
- Astronomical and nuclear sciences
- Nuclear Materials and Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Electron and X-Ray Spectroscopy Techniques
- Model Reduction and Neural Networks
Nanyang Technological University
2016-2022
Singapore Polytechnic
2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1999-2009
CEA Grenoble
1993-2008
CEA Paris-Saclay
2008
CEA DAM Île-de-France
2001-2007
Centre National de la Recherche Scientifique
2003
Kyoto University
1999
GANIL
1986-1991
PhysioPathologie des Adaptations Nutritionnelles
1989
Lead (Pb) halide perovskites have attracted tremendous attention in recent years because of their rich optoelectronic properties, which resulted more than 22% power conversion efficient photovoltaics (PVs). Nevertheless, Pb-metal toxicity remains a huge hurdle for extensive applications these compounds. Thus, alternative compounds with similar properties need to be developed. Bismuth possesses electronic structure that lead the presence ns2 electrons exhibit structural variety as well...
We present the first direct measurement of electric polarizability isolated C60 molecules by molecular beam deflection technique. have obtained a value 76.5±8.0 Å3 which is consistent with most recent calculations and slightly lower than measured in fullerite crystals.
Bismuth-based halide perovskite derivatives have now attracted huge attention for photovoltaic (PV) applications after the unparalleled success of lead-based perovskites. However, performances PV devices based on these compounds are poor, despite theoretical predictions. In this Article, we investigated electronic structure and defect formation energies Cs3Bi2I9 using density functional theory (DFT) calculations. The calculated bandstructure indicates an indirect bandgap high carrier...
Abstract Bismuth‐based ternary halides have recently gained a lot of attention as lead‐free perovskite materials. However, photovoltaic performances these devices remain poor, mostly due to their low‐dimensional crystal structure and large bandgap. Here, dynamic hot casting technique fabricate silver bismuth iodide‐based solar cells under an ambient atmosphere with power conversion efficiencies above 2.5% is demonstrated. Silver iodides are 3D analogs complex suitable bandgap for single...
Classical Rayleigh theory predicts an instability of a surface charged liquid sphere, when the Coulomb energy E(C) exceeds twice E(S). Previously, electrified droplets have been found to disintegrate at fissility X=E(C)/2E(S) well below one, however. We determine stability in electrodynamic levitator by observing amplitude and phase their quadrupolar shape oscillations as function fissility. With this novel approach, which does not rely on independent determination charge tension droplets,...
The multiple ionization of alkali-metal clusters by low energy ions is investigated experientially for the first time. Multi-ionized possibly undergoing Coulomb dissociation are formed and detected. Free sodium a few hundred atoms have been bombarded different ion beams ( ${\mathrm{H}}^{+}$, ${\mathrm{O}}^{5+}$, ${\mathrm{Ar}}^{8+}$) velocity ranging from $0.5\ifmmode\times\else\texttimes\fi{}{10}^{8}$ to $2.2\ifmmode\times\else\texttimes\fi{}{10}^{8}\mathrm{cm}/\mathrm{s}$. Critical sizes...
Excitation energies and associated oscillator strengths for dipole-excited states of alkali-metal clusters--treated as jellium spheres--are calculated in the random-phase approximation (RPA). Closed-shell systems with 8, 20, 34, 40, 58, 92 delocalized electrons are considered. The ground state is described Hartree-Fock (HF) approximation. excitation spectrum determined by solving RPA equations. Exchange contributions taken into account completely. theoretical oscillator-strength distribution...
Relativistic many-body theory is applied to determine amplitudes for 4p\ensuremath{\rightarrow}4s, 4p\ensuremath{\rightarrow}3d, and 3d\ensuremath{\rightarrow}4s transitions in ${\mathrm{Ca}}^{+}$; 5p\ensuremath{\rightarrow}5s, 5p\ensuremath{\rightarrow}4d, 4d\ensuremath{\rightarrow}5s ${\mathrm{Sr}}^{+}$; 6p\ensuremath{\rightarrow}6s, 6p\ensuremath{\rightarrow}5d, 5d\ensuremath{\rightarrow}6s ${\mathrm{Ba}}^{+}$. The calculations, which are carried out through third order perturbation...
We have measured the static dipole polarizability of Nay−xLix clusters (with y=2, 3, 4, and 8) by molecular beam deflection technique. For a given size, pure lithium is smaller than sodium clusters. mixed clusters, smooth decrease in observed as proportion atoms increases. NaLi molecule, both experimental permanent average been obtained. Experimental results are compared to density functional theory configuration interaction single double (CISD) ab initio calculations.
Ground-state properties of alkali-metal clusters are investigated within the framework jellium model from standpoint either local-density approximation density-functional theory or nonlocal Hartree-Fock theory. Accordingly, optical response is calculated microscopically corresponding time-dependent The present study deals with closed-shell systems up to 200 delocalized electrons. A comparative investigation various approximations carried out. In spite significantly different mean-field...
The ${\ensuremath{\pi}}^{+}$ production in $85A$-MeV C+C and C+Au reactions has been studied for $20 \mathrm{MeV}<~{E}_{\ensuremath{\pi}}<~80 \mathrm{MeV}$ ${\ensuremath{\theta}}_{\mathrm{lab}}>55\ifmmode^\circ\else\textdegree\fi{}$. cross sections, $\frac{{d}^{2}\ensuremath{\sigma}}{d\ensuremath{\Omega}\mathrm{dE}}$, fall exponentially with ${E}_{\ensuremath{\pi}}$ are 9 times larger than C+C. angular distribution is backward peaked the nucleon-nucleon c.m. system, while it weakly forward...
2014 Les rendements des masses fragments primaires, mesurés pour les valeurs plus élevées de l'énergie cinétique libérée dans la fission 233U et 235U induite par neutrons thermiques, ne révèlent aucune préférence fragmentations en deux noyaux masse paire.Nos données suggèrent outre que le méca- nisme brisure paires interviendrait avant scission, ce qui revient à dire basse énergie serait un processus fortement dissipatif.Abstract.2014 Primary fragment mass yields, measured at the highest...
We present the deformation pathway of critically charged glycol and water droplets from onset Rayleigh instability compare it to numerical results, obtained for perfectly conducting inviscid droplets. In this simple model presented here, time evolution droplet shape is given by velocity potential equation. The Laplace equation solved expanding onto harmonic functions. For part dominated electrostatic pressure, calculations reproduce experimental data nicely, both, microdroplets. find that in...
The first results of direct measurements heavy-ion reaction cross sections, ${\ensuremath{\sigma}}_{R}$, with use the beam attenuation method are reported. For $^{12}\mathrm{C}$ + system ${\ensuremath{\sigma}}_{R}$ was measured at three incident energies, 112, 360, and 996 MeV. data show deviations from geometrical section agree recent theoretical predictions based on Glauber theory.
This paper proposes the preparation and formula analysis of anti-biofouling Titania–polyurea (TiO2–SPUA) spray coating, which uses nano-scale antibacterial photocatalytic agents, titanium dioxide, to construct regularly hydrophobic surface texture on polyurea coating system. Through formulating performance, it is found causal factors include TiO2, wettability morphology in order their importance. The most optimized group able obtain uniform textures, high contact angle (91.5°), low energy...
Static electric dipole polarizabilities of lithium clusters made n $(n=2--22)$ atoms have been measured. The experiment consists deflecting a collimated cluster beam through static inhomogeneous field. strong decrease per atom from Li to ${\mathrm{Li}}_{3}\ensuremath{-}{\mathrm{Li}}_{4}$ shows that electronic delocalization is reached for very small sizes. Moreover, directly measured are consistent with photoabsorption data. They thus confirm unambiguously the ``missing'' optical strength in...