A5088141922- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Astrophysics and Star Formation Studies
- Inorganic Fluorides and Related Compounds
- Analytical Chemistry and Chromatography
- Astronomical Observations and Instrumentation
- Solid-state spectroscopy and crystallography
- Chemical Reactions and Isotopes
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Sensor Technologies
- Molecular spectroscopy and chirality
- Chemical Thermodynamics and Molecular Structure
- Acoustic Wave Resonator Technologies
- Astro and Planetary Science
- Thermodynamic properties of mixtures
- Fluorine in Organic Chemistry
- Terahertz technology and applications
- Crystallography and molecular interactions
- Eicosanoids and Hypertension Pharmacology
- Advanced NMR Techniques and Applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Astronomy and Astrophysical Research
Laboratoire de Physique des Lasers, Atomes et Molécules
2015-2024
Université de Lille
2014-2024
Centre National de la Recherche Scientifique
2013-2024
Interface (United States)
2023
Laboratoire de Physique des Interfaces et des Couches Minces
2019-2023
École Nationale Supérieure de Chimie de Rennes
2010-2017
Laboratoire Interuniversitaire des Systèmes Atmosphériques
2009-2017
Laboratoire Techniques, Territoires et Sociétés
2009-2017
Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies
2017
Sorbonne Université
2017
N-methylformamide, CH3NHCHO, may be an important molecule for interstellar pre-biotic chemistry because it contains a peptide bond. The rotational spectrum of the most stable trans conformer CH3NHCHO is complicated by strong torsion-rotation interaction due to low barrier methyl torsion. We use two absorption spectrometers in Kharkiv and Lille measure spectra over 45--630 GHz. analysis carried out using Rho-axis method RAM36 code. search N-methylformamide toward hot molecular core Sgr B2(N2)...
Abstract We report the detection of interstellar methoxymethanol (CH 3 OCH 2 OH) in Atacama Large Millimeter/submillimeter Array (ALMA) Bands 6 and 7 toward MM1 core high-mass star-forming region NGC 6334I at ∼0.″1–1″ spatial resolution. A column density 4(2) × 10 18 cm −2 T ex = 200 K is derived MM1, ∼34 times less abundant than methanol OH), significantly higher predicted by astrochemical models. Probable formation destruction pathways are discussed, primarily through reaction CH OH...
Using the Yebes 40m and IRAM 30m radiotelescopes, we detected two series of harmonically related lines in space that can be fitted to a symmetric rotor. The have been seen towards cold dense cores TMC-1, L483, L1527, L1544. High level theory
<i>Context. <i/>Laboratory measurements and analysis of the microwave millimeter-wave spectra potential interstellar molecules are a prerequisite for their subsequent identification by radioastronomical techniques. The spectral provides spectroscopic parameters that used in assignment procedure laboratory spectra, also predict frequencies transitions not measured with high degree precision. <i>Aims. <i/>An experimental study its theoretical is presented <sup>13<sup/>C<sub>2<sub/>-methyl...
Two new spectrometers based on the direct digital frequency synthesizers are presented. The instruments characterized by a high rate (up to 100 GHz/hr) of molecular spectrum recording with accuracy measuring transition frequencies (the measurement error for isolated spectral lines lies within ±0.002 MHz provided that signal-to-noise ratio is 50 or greater). Frequency modulation radiation source guarantees stability and determinancy frequency-modulated signal parameters makes it possible...
Context. Formamide is the simplest bearer of peptide bond detected in interstellar medium (ISM).
We report on the tentative detection of trans ethyl methyl ether (tEME), t-CH3CH2OCH3, through identification a large number rotational lines from each one spin states molecule towards Orion KL. also search for gauche-trans-n-propanol, Gt-n-CH3CH2CH2OH, an isomer tEME in same source. have identified both species IRAM 30 m line survey and ALMA Science Verification data. obtained maps to establish spatial distribution these species. Whereas mainly arises compact ridge component Orion,...
We report the detection in space of a new molecular species which has been characterized spectroscopically and fully identified from astrophysical data. The observations were carried out with 30m IRAM telescope. molecule is ubiquitous as its $J$=2$\rightarrow$1 transition found cold clouds, prestellar cores, shocks. However, it not hot cores Orion-KL carbon-rich evolved star IRC+10216. Three rotational transitions perfect harmonic relation J'=2/3/5 have core B1b. 1Sigma electronic ground...
Context.Astronomical spectra of hot molecular clouds in the wavelength range from centimeter to submillimeter show a huge number rotational lines due emission complex organic molecules, and large fraction these are unidentified. The assignment unidentified new known molecules excited states, or their isotopologues requires good knowledge spectroscopic parameters molecules.
New centimeter-wave (7–80 GHz) and submillimeter-wave (580–661 spectra of a deuterated species methyl formate (DCOOCH3) have been measured. Transitions with maximum value J = 64 K 36 assigned fitted together previous measurements. The internal rotation this compound was treated using the so-called rho axis method. A total 1703 transitions were Only 24 parameters employed in final fit, which has an rms deviation 94.2 kHz. dipole moment nuclear quadrupole coupling constants specie also...
Context. Astronomical survey of interstellar molecular clouds needs a previous analysis the spectra in microwave and sub-mm energy range to be able identify them. We obtained very accurate spectroscopic constants comprehensive laboratory rotational spectra. These can used predict transition frequencies that were not measured precisely.
Context. Recent experimental works have studied the possible formation of hydroxyacetonitrile on astrophysical grains. It was formed from hydrogen cyanide (HCN) and formaldehyde (H 2 CO) in presence water under interstellar medium conditions. Because these precursor molecules are abundant, is an excellent target for detection. Aims. Previous studies rotational spectra were limited to 40 GHz, resulting inaccurate line list when predicted up millimeter-wave range. We measured analyzed its 600...
Accurate quantification of the column density di-deuterated methanol is a key missing puzzle piece in otherwise thoroughly constrained family D-bearing deeply embedded low-mass protostellar system and astrochemical template source IRAS16293-2422. A spectroscopic dataset for astrophysical purposes built CHD$_{2}$OH made publicly available to facilitate accurate characterization this species surveys. The newly computed line list partition function are used search towards IRAS16293-2422 B data...
Equilibrium structures, r(e), of the heterocyclic molecules oxirane, furazan, furan, ethylene ozonide, and 1,3,4-oxadiazole have been determined using three different, somewhat complementary techniques: a completely experimental technique (r(m)), semiexperimental (r(e)(SE), whereby equilibrium rotational constants are derived from effective ground-state corrections based principally on an ab initio cubic force field), (r(e)(BO), geometry optimizations usually performed at coupled cluster...
We have surveyed a sample of massive star-forming regions located over range distances from the Galactic center for methyl formate, HCOOCH3, and its isotopologues H13COOCH3 HCOO13CH3. The observations were carried out with APEX telescope in frequency 283.4–287.4 GHz. Based on observations, we report tentative detections 13C-methyl formate isotopologue HCOO13CH3 toward following four regions: Sgr B2(N-LMH), NGC 6334 IRS 1, W51 e2, G19.61-0.23. In addition, used 1 mm ALMA science verification...
Context . Nitriles constitute almost 20% of the molecules observed in interstellar medium, whereas only one dinitrile and isocyanonitrile compound have been detected up to now. The lack detections such compounds may be partially explained by accurate spectroscopic data on their rotational spectra. Aims Two small seven-atom dinitriles, malononitrile NCCH 2 CN isocyanoacetonitrile NC, were chosen as target species for this study. For goal study is systematize all previous measurements, extend...
Highly correlated ab initio calculations with large basis sets are reported for formyl fluoride, OCHF; difluorocarbene, CF2; monofluoromethylene, CHF, and difluoromethane, CH2F2. Based on CCSD(T)/cc-pVQZ results (including a correction the effect of diffuse functions fluorine oxygen), equilibrium structures derived. These compared to experimental results, when available, those similar molecules; their accuracy is discussed.
Context. Ethyl cyanide is an abundant molecule in hot molecular clouds. Its rotational spectrum very dense and several hundreds of transitions within the ground state have been identified clouds 40-900 GHz frequency range. Lines from 13C isotopically substituted ethyl were Orion.