A5068325703- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Particle physics theoretical and experimental studies
- Spectroscopy and Quantum Chemical Studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Synthesis and characterization of novel inorganic/organometallic compounds
- Semiconductor Quantum Structures and Devices
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Video Surveillance and Tracking Methods
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Laser Applications
- Digital Innovation in Industries
- Quantum optics and atomic interactions
- Innovation, Technology, and Society
- Corporate Management and Leadership
- Crystallography and molecular interactions
- Synthesis and Biological Evaluation
- Organoboron and organosilicon chemistry
- Thermal and Kinetic Analysis
- Corporate Governance and Management
Université Paris-Saclay
2024-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2024-2025
Institut National de Physique Nucléaire et de Physique des Particules
2024-2025
Centre National de la Recherche Scientifique
2024-2025
Infineon Technologies (Germany)
2024
SRH University Berlin
2023
Public Health Agency of Canada
2022
Coburg University of Applied Sciences
2020
Forschungszentrum Jülich
2007-2018
Theologische Fakultät Fulda
2017
Details of the hydration and water exchange mechanism Zn2+ have been studied using density functional calculations with a variety different basis sets. The computed structures energies for complexes type [Zn(H2O)n]2+ n = 1−6 are in good agreement previous results obtained from ab initio self-consistent reaction field methods. Extension our investigations to second coordination (first solvation) sphere thus general [Zn(H2O)n]2+·mH2O 5 m 1, 2 6 1 reveals two types having either one or hydrogen...
The differential and total cross sections for the dp→3Heη reaction have been measured in a high precision statistics COSY-ANKE experiment near threshold using continuous beam energy ramp up to an excess Q of 11.3 MeV with essentially 100% acceptance. kinematics allowed mean value be determined about 9 keV. Evidence is found effects higher partial waves Q≳4 MeV. very rapid rise section its maximum within 0.5 implies large η3He scattering length hence presence quasibound state extremely close...
We report a strong (300:1) excitonic resonance in time-resolved (100 fs) four-wave mixing GaAs quantum wells as function of the incident photon energy and show that it results from large difference dephasing rates excitons free carriers. conclude dominate even when they make up only small fraction excited states. These results, conjuction with new exciton-phonon scattering, provide insights into previous studies performed spectrally broad ultrashort pulses.
The pp→pK+Y0 reaction has been studied for hyperon masses m(Y0)⩽1540MeV/c2 at COSY-Jülich by using a 3.65 GeV/c circulating proton beam incident on an internal hydrogen target. Final states comprising two protons, one positively charged kaon and negatively pion have identified with the ANKE spectrometer. Such configurations are sensitive to production of ground state Λ Σ0 hyperons as well Σ0(1385) Λ(1405) resonances. Applying invariant- missing-mass techniques, overlapping excited could be...
The structures and binding energies of a series C−H···X hydrogen-bonded complexes involving acetylene, ethylene, ethane as proton donors the first- second-row hydrides CH4, NH3, OH2, FH, PH3, SH2, ClH acceptors have been determined. Geometries were optimized with both MP2 B3-LYP methods in conjuction 6-311+G(3df,2p) basis set. In general, we note good agreement between structures. However, for some very weakly bound larger differences exist, particularly r(H···X) distance, these instances...
Abstract Kinetic problems for off‐resonance excitation (dynamical Stark effect) and resonant (laser‐induced gaps) are studied. Within the Hartree‐Fock theory, shift bleaching of exciton line evaluated. The influence photon statistics on light‐induced gaps is investigated. Open questions concerning transient response clarified.
Abstract Starting from the kinetic equations for nonequilibrium Green's functions, a practical method is proposed which allows to solve set of two‐time propagators numerically. In contrast usual semiconductor Bloch with phenomenological damping relaxation and dephasing processes are treated microscopically case coupling bath LO‐phonons. Beside standard approximation treatment LO‐phonon scattering, no further approximations performed. For low‐density limit we compare exact results approximate...
We investigate ultrafast multi-state nuclear dynamics in a triatomic cluster. In particular, we explore how the intracluster of Ag3−/Ag3/Ag3+ system is reflected femtosecond pump-probe negative ion-to neutral-to positive ion (NENEPO) signals. The based on classical trajectories ground electronic adiabatic state potential hypersurfaces obtained from accurate ab initio quantum chemistry calculations. Ag3 initiated linear transition involves distinct sequential processes configurational...
The deuteron tensor analysing power T20 of the d→p→He3η reaction has been measured at COSY-ANKE facility in small steps excess energy Q up to Q=11 MeV. Despite square production amplitude varying by over a factor five through this range, shows little dependence. This is evidence that final state interaction causing variation not influenced spin configuration entrance channel. weak angular dependence observed for provides useful insight into structure near threshold.
The structure and water exchange mechanism of hexahydrated Ti(III), its hydrolysis, the analogous hydroxo−aqua complexes have been studied using density functional theory (DFT) calculations. Isolated metal−aqua metal−hydroxo clusters corresponding to gas-phase (T = 0 K) were used approximate model reactions. [Ti(H2O)6]3+ was found Ci symmetry Ti−O bond lengths 2.094 Å. reaction this complex follows an (almost) limiting A with energy activation 15.8 kcal mol-1. hydrolysis Ti(III) modeled by...
Ultrafast ground state nuclear dynamics of small coinage metal clusters is theoretically explored in the framework negative ion to neutral positive (NeNePo) femtosecond pump−probe spectroscopy with aim determine scope and perspective this technique. This approach involves preparation an initial ensemble anionic cluster, one-photon detachment by pump pulse, propagation system on electronic state, detection via cationic a time-delayed ionizing probe pulse. The calculations NeNePo-ZEKE signals...
The monomeric fragment In-C(SiMe3)3 was inserted into the Ni-Ni bond of Ni2Cp2(mu-CO)2 upon treatment carbonyl complex with tetraindium(I) compound In4[C(SiMe3)3]4, 1, in a molar ratio 4 to 1. product (3) contains an indium atom coordinated one alkyl substituent and two Ni(Cp)CO groups planar coordination sphere. Reaction starting compounds 2 1 led replacement both CO ligands by InR groups. A (4) formed that is isostructural nickel has Ni2 couple bridged terminally cyclopentadienyl insertion...
The effect of a variety theoretical methods (HF, B3-LYP, MP2, QCISD, and CCSD(T)) basis sets (from 6-31G(d) to 6-311+G(3df,2p)) on the calculated geometry dimerization energy acetylene−ammonia dimer HCCH···NH3 is examined. has C3v symmetry with acetylene acting as hydrogen bond donor. Our highest level calculations (viz. CCSD(T)/6-311+G(3df,2p) including BSSE correction) predict an equilibrium contact distance r(H···N) 2.280 Å binding ΔEe 14.1 kJ mol-1. Incorporation scaled...
We present a theoretical study of femtosecond photo isomerization process due to nonadiabatic radiationless decay from the first excited state through conical intersection occurring in one nonstoichiometric halide-deficient clusters with excess electron (Na3F2). This is an extension adiabatic dynamics presented accompanying paper [J. Chem. Phys. 114, 2106 (2001)] for other members NanFn−1 series characterized by strong ionic bonding which “frozen bonds” approximation has been justified,...
The differential and total cross sections for the $\mathit{dp}\ensuremath{\rightarrow}^{3}\mathrm{He}\ensuremath{\eta}$ reaction have been measured at COSY--ANKE excess energies of 19.5, 39.4, 59.4 MeV over full angular range. results are in line with trends apparent from detailed near-threshold studies also largely agree those CELSIUS, though present data much better coverage near forward backward directions, thus allowing firmer conclusions to be drawn. While 19.5 can described terms $s$-...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this letter, we present the replication of out-of-plane coupling microcomponents using hot embossing, through fabrication a metal mould by electroforming polymer template patterned means deep proton writing (DPW). We compare surface roughness and optical performance embossed replicas with DPW prototypes can conclude that replicated components exhibit only small increase in very decrease...
We propose a new strategy for optimal control with tailored pump−dump pulses which drive system of moderate complexity via electronically excited states to desired objective in the ground state maximal yield. It is based on concept intermediate target selects appropriate Franck−Condon window at given time delay between two mandatory reaching optimally objective. The existence ensures connective pathway initial and state, necessary controllability multidimensional systems involving electronic...
The pp -> pi0 differential cross section has been measured with the ANKE spectrometer at COSY-Juelich for pion cms angles between 0 and 15.4 degrees a proton beam energy of 0.8 GeV. selection diproton pairs an excitation E_{pp} < 3 MeV ensures that final system is dominantly in spin-singlet 1S0 state. kinematics are therefore very similar to those d pi+ but different spin isospin transitions. results will thus provide crucial extra test production models nucleon-nucleon collisions....
The cross section for inclusive multipion production in the $pp\ensuremath{\rightarrow}ppX$ reaction was measured at COSY-ANKE four beam energies, 0.8, 1.1, 1.4, and 2.0 GeV, low excitation energy final $pp$ system, such that diproton quasiparticle is $^{1}S_{0}$ state. At three higher missing-mass ${M}_{X}$ spectra show a strong enhancement ${M}_{X}$, corresponding to an Abashian-Booth-Crowe effect moves steadily larger values as increased. Despite structure looking very different 0.8...
How can living matter arise from dead matter? All known systems are built around information stored in RNA and DNA. To protect this against molecular degradation diffusion, the second law of thermodynamics imposes need for a non-equilibrium driving force. Following series successful experiments using thermal gradients, we have shown that heat gradients across sub-millimetre pores drive accumulation, replication, selection ever longer molecules, implementing all necessary parts Darwinian...
We present a theoretical study of the multistate dynamics Ag3-/Ag3/Ag3+ system on time scale nuclear motion, as explored by femtosecond pump−probe negative ion-to neutral-to positive ion (NENEPO) spectroscopy. The Ag3 cluster initiated from its linear transition state involves configurational relaxation, intracluster collision, and onset IVR, resonant dissipative IVR vibrational equilibration, whose scales were determined. Our analysis reveals that theory is essential for elucidation rich...