A5027795278- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Spectroscopy and Laser Applications
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Atmospheric chemistry and aerosols
- Astro and Planetary Science
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- nanoparticles nucleation surface interactions
- Atomic and Subatomic Physics Research
- Heat transfer and supercritical fluids
- Quantum, superfluid, helium dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Cyclone Separators and Fluid Dynamics
- Spacecraft and Cryogenic Technologies
- Chemical Thermodynamics and Molecular Structure
- Gas Dynamics and Kinetic Theory
- Health, Environment, Cognitive Aging
- Spectroscopy and Chemometric Analyses
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Effects in Electronics
- Advancements in Semiconductor Devices and Circuit Design
- Combustion and flame dynamics
Institut de Physique de Rennes
2018-2024
Fonctions Optiques pour les Technologies de l’information
2024
Centre National de la Recherche Scientifique
2019-2023
University of Cologne
2022-2023
Université de Rennes
2019-2023
California Institute of Technology
2021
Indian Institute of Science Education and Research Mohali
2019
Syracuse University
1988-1989
We present laboratory rotational spectroscopy of five isomers cyanoindene (2-, 4-, 5-, 6-, and 7-cyanoindene) using a cavity Fourier-transform microwave spectrometer operating between 6-40 GHz. Based on these measurements, we report the detection 2-cyanoindene (1H-indene-2-carbonitrile; 2-C$_9$H$_7$CN) in GOTHAM line survey observations dark molecular cloud TMC-1 Green Bank Telescope at centimeter wavelengths. Using combination Markov Chain Monte Carlo (MCMC), spectral stacking, matched...
Based on a novel laboratory method, 14 mm-wave lines of the molecular ion H$_2$CCCH$^+$ have been measured in high resolution, and spectroscopic constants this asymmetric rotor determined with accuracy. Using Yebes 40 m IRAM 30 radio telescopes, we detect four towards cold dense core TMC-1. With dipole moment about 0.55 Debye obtained from high-level ab initio calculations, derive column density 5.4$\pm$1$\times$10$^{11}$ cm$^{-2}$ 1.6$\pm$0.5$\times$10$^{11}$ for ortho para species,...
Abstract The low-temperature reaction between CN and benzene (C 6 H ) is of significant interest in the astrochemical community due to recent detection benzonitrile, first aromatic molecule identified interstellar medium (ISM) using radio astronomy. Benzonitrile suggested be a proxy for benzene, one simplest molecules, which may precursor polycyclic hydrocarbons. In order assess robustness benzonitrile as kinetics measurements are required confirm whether remains rapid at low gas...
Experimental studies of the products elementary gas-phase chemical reactions occurring at low temperatures (<50 K) are very scarce, but importance for fundamental reaction dynamics, comparisons with high-level quantum dynamical calculations, and, in particular, providing data modeling cold astrophysical environments, such as dense interstellar clouds, atmospheres outer planets, and cometary comae. This study describes construction testing a new apparatus designed to measure product...
The first rovibrational (IR) and rotational (mm-wave) spectra are measured for c-C 3 H 2 D + , a potential detection target in interstellar space.
A Monte Carlo simulation method is used to study thermal desorption of gas molecules from mixed adlayers containing two species. The effects lateral interactions among adatoms on the spectra are discussed. It shown that attractive lead sharper peaks and occurs at high temperatures, whereas repulsive multiple peak spectra. found between unlike affect for species with lower energy only, desorb together only in certain cases. Lateral also kinetics significantly very different behaviour may be obtained.
AbstractThe antisymmetric C–H stretching vibration ν3 (2Π←2Π) of ionised acetylene, C2H2+, has been revisited using a cryogenic 22-pole ion trap machine. Two action spectroscopic techniques, the novel leak-out spectroscopy (LOS) method and more established laser-induced reactions (LIR) method, are applied compared. Mass selectivity temperatures down to 4 K enabled observation uncontaminated spectra in which Λ-doubling components this open-shell molecule mostly well resolved, leading slight...
Methanol (CH3OH) is considered by astronomers to be the simplest complex organic molecule (COM) and has been detected in various astrophysical environments, including protoplanetary disks, comets, interstellar medium (ISM). Studying reactivity of methanol at low temperatures will aid our understanding formation other potentially prebiotic molecules. A major destruction route for many neutral COMs, methanol, via their reactions with radicals such as CN, which ubiquitous space. Here, we study...
CN is known for its fast reactions with hydrocarbons at low temperatures, but relatively few studies have focused on the between and aromatic molecules. The recent detection of benzonitrile in interstellar medium, believed to be produced by reaction benzene, has ignited interest studying these reactions. Here, we report rate constants + toluene (C7H8) 15 294 K using a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme; kinetics uniform supersonic flow) apparatus coupled pulsed...
The rovibrational spectrum of the molecular ion H2CCCH+ was investigated in a 4 K cryogenic trap instrument employing leak-out spectroscopy method. Transitions within fundamental ν1 (C–H stretch) and combination band ν3+ν5 (C–C stretches) were detected, search aided by high level quantum chemical calculations. analysis measurements enabled us to predict rotational structure ground state. Using rotational-vibrational double-resonance scheme, 14 pure transitions measured. This, turn, led radio...
Reactive desorption of gas molecules from mixed adlayers containing two species is studied using a Monte Carlo simulation scheme. The effects lateral interactions among adatoms, adsorbate islanding, surface diffusion and initial coverage on the spectra are examined. Results show that for attractive interactions, islanding lead to an increase in activation energy, whereas repulsive energy decreases. also indicate slowly decaying spectrum may be obtained when mobile do not interact with other...
We present laboratory rotational spectroscopy of five isomers cyanoindene (2-, 4-, 5-, 6-, and 7-cyanoindene) using a cavity Fourier-transform microwave spectrometer operating between 6-40 GHz. Based on these measurements, we report the detection 2-cyanoindene (1H-indene-2-carbonitrile; 2-C$_9$H$_7$CN) in GOTHAM line survey observations dark molecular cloud TMC-1 Green Bank Telescope at centimeter wavelengths. Using combination Markov Chain Monte Carlo (MCMC), spectral stacking, matched...
Based on a novel laboratory method, 14 mm-wave lines of the molecular ion H$_2$CCCH$^+$ have been measured in high resolution, and spectroscopic constants this asymmetric rotor determined with accuracy. Using Yebes 40 m IRAM 30 radio telescopes, we detect four towards cold dense core TMC-1. With dipole moment about 0.55 Debye obtained from high-level ab initio calculations, derive column density 5.4$\pm$1$\times$10$^{11}$ cm$^{-2}$ 1.6$\pm$0.5$\times$10$^{11}$ for ortho para species,...