A5082368417- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Molecular Spectroscopy and Structure
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Carbohydrate Chemistry and Synthesis
- Gas Dynamics and Kinetic Theory
- Atomic and Molecular Physics
- Catalytic Processes in Materials Science
- Photochromic and Fluorescence Chemistry
- Nonlinear Optical Materials Studies
- Glycosylation and Glycoproteins Research
- Luminescence and Fluorescent Materials
- Nanoplatforms for cancer theranostics
- Advanced Combustion Engine Technologies
- Geometric Analysis and Curvature Flows
- Synthesis of Organic Compounds
- Catalysis and Oxidation Reactions
- Mass Spectrometry Techniques and Applications
- Synthesis and Biological Evaluation
- Inorganic Fluorides and Related Compounds
- Multiculturalism, Politics, Migration, Gender
Institut des Sciences Moléculaires
2014-2024
Université de Bordeaux
2013-2024
University of British Columbia
2024
Institut de Physique de Rennes
2013-2022
Centre National de la Recherche Scientifique
2010-2022
Université de Rennes
2007-2022
Harvard University Press
2019
Laboratoire d'Astrophysique de Bordeaux
2008-2015
Département de Chimie Moléculaire
2015
Université de Poitiers
2010-2014
Chemical models used to study the chemical composition of gas and ices in interstellar medium are based on a network reactions associated rate coefficients. These coefficients partially compiled from data literature, when available. We present this paper kida.uva.2014, new updated version kida.uva public gas-phase first released 2012. In addition description many specific updates, we illustrate changes predicted abundances molecules for cold dense cloud conditions as compared with results...
We report combined studies on the prototypical S(1D2) + H2 insertion reaction. Kinetics and crossed-beam experiments are performed in experimental conditions approaching cold energy regime, yielding absolute rate coefficients down to 5.8 K relative integral cross sections collision energies as low 0.68 meV. They supported by quantum calculations a potential surface treating long-range interactions accurately. All results consistent excitation function behavior is explained terms of...
The role of HO3 as a temporary reservoir atmospheric OH radicals remains an open question largely because the considerable uncertainty in value dissociation energy HO-O2 bond (D0) or, equivalently, standard enthalpy formation (Delta(f)H;{\overline{);\circ }}$$). Using supersonic flow apparatus, we have observed by means laser-induced fluorescence decay presence O2 at temperatures between 55.7 and 110.8 kelvin (K). Between 87.4 99.8 K, concentration approached nonzero long times, allowing...
Rate coefficients for the reactions of ground state carbon atoms, C(3PJ), with four unsaturated hydrocarbons C2H2, C2H4, and have been measured at temperatures down to 15 K. The experiments performed in a continuous flow CRESU (Cinétique de Réaction en Écoulement Supersonique Uniforme) apparatus using pulsed laser photolysis C3O2 generate C(3PJ) atoms laser-induced fluorescence vacuum ultraviolet observe kinetic decays hence determine rate coefficients. All are found occur rates close...
We present a joint crossed molecular beam and kinetics investigation combined with electronic structure statistical calculations on the reaction of ground-state cyano radical, CN(X2Σ+), 1,3-butadiene molecule, H2CCHCHCH2(X1Ag), its partially deuterated counterparts, H2CCDCDCH2(X1Ag) D2CCHCHCD2(X1Ag). The studies indicate that proceeds via long-lived C5H6N complex, yielding C5H5N isomer(s) plus atomic hydrogen under single collision conditions as nascent product(s). Experiments 1,3-butadienes...
A continuous supersonic flow reactor has been used to measure rate constants for the C + NH3 reaction over temperature range 50 296 K. atoms were created by pulsed laser photolysis of CBr4. The kinetics title followed directly vacuum ultra-violet induced fluorescence (VUV LIF) loss and through H formation. experiments show unambiguously that is rapid at K, becoming faster lower temperatures, reaching a value 1.8 10-10 cm3 molecule-1 s-1 As this not currently included in astrochemical...
The synthesis of ethenylene-based periodic mesoporous organosilica nanoparticles for two-photon imaging and photodynamic therapy breast cancer cells is described.
A CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus has been used to measure rate coefficients for the reactions of C (3P) with O2 and NO at temperatures from 295 K down 15 K. atoms were, first time in a kinetic study, monitored directly by vacuum ultraviolet laser-induced fluorescence. The both increase as temperature is lowered, matching expressions k(C+O2)=(4.9±0.8)×10−11 (T/298 K)−(0.32±0.08) cm3 molecule−1 s−1 k(C+NO)=(1.5±0.4)×10−10 K)−(0.16±0.14) s−1.
The kinetics of reactions C2(a(3)Pi(u)) and C2(X(1)Sigma(g)(+)) with various hydrocarbons (CH4, C2H2, C2H4, C2H6, C3H8) have been studied in a uniform supersonic flow expansion over the temperature range 24-300 K. Rate coefficients obtained by using pulsed laser photolysis-laser induced fluorescence technique, where both radicals were produced at same time but detected separately. reactivity triplet state was found to be significantly lower than that singlet ground for all reactants whole...
The reaction between sulfur atoms in the first electronically excited state, S((1)D), and ethene (C(2)H(4)) has been investigated a complementary fashion (a) crossed-beam dynamic experiments with mass spectrometric detection time-of-flight (TOF) analysis at two collision energies (37.0 45.0 kJ mol(-1)), (b) low temperature kinetics ranging from 298 K down to 23 K, (c) electronic structure calculations of stationary points product energetics on C(2)H(4)S singlet triplet potential energy...
The kinetics of the reactions linear butadiynyl radical, C4H (CCCCH), with a variety unsaturated hydrocarbons have been studied over temperature range 39–300 K using CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme, or reaction in uniform supersonic flow) apparatus combined pulsed laser photolysis–laser induced fluorescence technique. rate coefficients for all are found to be excess 10−10 cm3 molecule−1 s−1 entire range. They can fitted following expressions (valid from 39...
The reaction between sulfur atoms in the first electronically excited state, S(1D), and methane (CH4), has been investigated a complementary fashion (a) crossed-beam dynamics experiments with mass spectrometric detection time-of-flight (TOF) analysis at two collision energies (30.4 33.6 kJ mol−1), (b) low temperature kinetics ranging from 298 K down to 23 K, (c) electronic structure calculations of stationary points product energetics on CH4S singlet potential energy surface. rate...
The excitation of fine-structure levels O(3P) by collisions is an important cooling process in the interstellar medium (ISM). We investigate here spin–orbit (de-)excitation O(3Pj, j = 0, 1, 2) induced with He, H and H2 based on quantum scattering calculations relevant rate coefficients 10–1000 K temperature range. underlying potential energy surfaces are derived from highly correlated abinitio calculations. Significant differences were found currently used astrophysical applications. In...
Abstract Tandem uncaging systems in which a two‐photon absorbing module and cage moiety, linked via phosphorous clip, that act together by Förster resonance energy transfer (FRET) have been developed. A library of these compounds, using different linkers cages (7‐nitroindolinyl or nitroveratryl) has synthesized. The investigation their absorption properties demonstrates the scope versatility engineering strategy towards efficient reveals surprising cooperative topological effects....
We present a combined experimental and theoretical low temperature kinetic study of water cluster formation. Water growth takes place in (23-69 K) supersonic flows. The observed kinetics formation clusters are reproduced with model based on predictions for the first steps clusterization. temperature- pressure-dependent association dissociation rate coefficients predicted an ab initio transition state theory master equation approach over wide range temperatures (20-100 pressures (10^{-6}-10 bar).
The reaction between excited sulfur atoms, S(1D), and the simplest alkene molecule, ethene, has been investigated in a complementary fashion (a) crossed-beam dynamic experiments with mass spectrometric detection time-of-flight (TOF) analysis at collision energy of 37.0 kJ mol−1, (b) low temperature kinetic ranging from room down to 23 K, (c) electronic structure calculations stationary points product energetics on C2H4S singlet potential surface. rate coefficients for total loss S(1D) are...
The kinetics of the reactions cyano radical, CN (X2sigma+) with three hydrocarbons, propane (CH3CH2CH3), propene (CH3CH=CH2) and 1-butyne (CH[triple band]CCH2CH3) have been studied over temperature range 23-298 K using a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme or Reaction Kinetics in Uniform Supersonic Flow) apparatus combined pulsed laser photolysis-laser induced fluorescence technique. These are interest for cold atmospheres Titan, Pluto Triton, as they might...
The product formation channels of ground state carbon atoms, C(3P), reacting with ammonia, NH3, have been investigated using two complementary experiments and electronic structure calculations. Reaction products are detected in a gas flow tube experiment (330 K, 4 Torr) tunable VUV photoionization coupled time flight mass spectrometry. Temporal profiles the species formed spectra used to identify primary C + NH3 reaction. In addition, H-atom is monitored by laser induced fluorescence from...
Tandem systems allowing enhanced two-photon (2P) absorption in a wavelength range permitting coupling of the primary excitation by energy transfer to an intramolecular cage known have fragmentation properties suited photolysis neuroscience is demonstrated lead 10-fold improvement 2P cross-section at experimentally compatible wavelengths.
We present both an experimental and a theoretical study of the reactions Si(3PJ) + O2 NO. The CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) technique is used to measure rate constants in temperature range 15–300 K. laws variation as function are found exhibit maximum around 30 K for experimentally described using following expressions: kSi+O2(T) = (1.72 ± 0.17) × 10−10 (T/300 K)−(0.53±0.10)exp−(17±4)K/T cm3 molecule−1 s−1 kSi+NO(T) (0.90 0.10) 10−10(T/300...