Stephane Bailleux

Stephane Bailleux
Université de Lille · Laboratoire PhLAM, UMR CNRS 8523

PhD

About

64
Publications
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601
Citations
Citations since 2016
11 Research Items
247 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050

Publications

Publications (64)
Article
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 lines have been seen towards the cold dense cores TMC-1, L483, L1527, and L1544. High level of theory ab initio calculations indicate that the best possible candidate is the acetyl cation, CH3C...
Preprint
Full-text available
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 lines have been seen towards the cold dense cores TMC-1, L483, L1527, and L1544. High level of theory ab initio calculations indicate that the best possible candidate is the acetyl cation, CH3C...
Article
Doublet, triplet and quartet hyperfine splitting patterns have been observed in the E-species component of the first excited (v t = 1) torsional state of CH 3 OH. Four series of lines dominate the available data: (i) a K = 6 ← 7, Q branch series of quartets, with 7 ≤ J ≤ 15; (ii) a K = 3 ← 2, Q branch series, with 3 ≤ J ≤ 18, which starts as quarte...
Article
Full-text available
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 the 30m IRAM telescope. The molecule is ubiquitous as its $J$=2$\rightarrow$1 transition has been found in cold molecular clouds, prestellar cores, and shocks...
Article
Context. Of the two structural isomers of CH 3 O, methoxy is the only radical whose astronomical detection has been reported through the observation of several rotational lines at 2 and 3 mm wavelengths. Although the hydroxymethyl radical, CH 2 OH, is known to be thermodynamically the most stable (by ~3300 cm ⁻¹ ), it has so far eluded rotational s...
Article
Full-text available
Context. The determination of isotopic ratios in interstellar molecules is a powerful probe of chemical routes leading to their formation. In particular, the 14N/15N abundance ratio of nitrogen-bearing species provides information on possible fractionation mechanisms. Up to now there is no accurate determination of this ratio in the interstellar me...
Article
In the nitrosyl halides series (XNO, where X = F, Cl, Br, I), INO is the only chemical species whose rotational spectrum has not been reported. Nitrosyl iodide, together with the nitryl (INO2), nitrite (IONO) and nitrate (IONO2) iodides, are believed to impact tropospheric ozone levels. Guided by our quantum chemical calculations, we report the det...
Article
Bromoiodomethane, CH2BrI, is a molecule of natural origin emitted in significant amount into the marine boundary layer. It can easily be decomposed by solar radiation, releasing Br and I atoms in the troposphere, which in turn impacts the atmospheric chemistry. Spectroscopy is an invaluable tool to monitor species present in the atmosphere. Since n...
Article
Full-text available
We report the tentative detection in space of the nitrosylium ion, NO+. The observations were performed toward the cold dense core Barnard 1-b. The identification of the NO+J?= 2-1 line is supported by new laboratory measurements of NO+ rotational lines up to the J?= 8-7 transition (953207.189?MHz), which leads to an improved set of molecular const...
Article
The ν4 fundamental band (CO2 antisymmetric stretching mode) of the FCO2 radical in the ground electronic state X˜2B2 has been recorded by Fourier-transform infrared spectroscopy at an effective resolution of 0.003 cm−1 between 1040 and 1130 cm−1. FCO2 was generated by vacuum flash pyrolysis at about 350 °C of FC(O)OO(O)CF. More than 3300 ro-vibrati...
Article
Full-text available
Context. High-resolution rotational spectroscopy of the imidogen radical has been limited to the 14NH and 14ND isotopologues. Imidogen is an important intermediate in the astronomical synthesis of ammonia. Recently, the 14N/15N isotopic ratio in ammonia has been obtained in cold, dense molecular clouds. Aims: We conducted a laboratory search for ro...
Article
Full-text available
Laboratory analysis of spectra of potential interstellar molecules from the radio-frequency to the THz range is a prerequisite for their subsequent identification by radioastronomical techniques. The spectral analysis allows us to derive molecular parameters that are able to model the frequency and intensity patterns of the transitions, as well as...
Article
Guided by a previous microwave study (9–35 GHz), the rotational spectrum of both chlorine isotopo-logues of chloroiodomethane in its vibrational and electronic ground state has been re-investigated in the microwave region and extended to the millimeter/submillimeter-wave region. Weaka-type transi-tions have been recorded by Fourier transform microw...
Article
The very high resolution of the HIFI instrument (134 kHz-1MHz) on board of Herschel needs very accurate laboratory measurements to detect unambiguously the signature of stable and unstable molecular species. Concerning the pure rotation spectra of new species, and particularly of open shell molecules, the first prediction could be far away and up t...
Article
Context. Pure rotational spectra in the field-free condition of the CH2 and CD2 isotopologues of the methylene radical have already been reported, whereas only six rotational transitions of the mono-deuterated species, CHD, detected by FIR-LMR spectroscopy have been. Aims: Spectra of the mono-deuterated methylene radical in its ground electronic st...
Article
Full-text available
Laboratory analysis of the microwave and millimeter-wave spectra of potential interstellar molecules is a prerequisite for their subsequent identification by radioastronomical techniques. The spectral analysis is used to obtain spectroscopic parameters that are used in the assignment procedure of the laboratory spectra, as well as to predict with a...
Article
Fourier-transform microwave and millimeter-wave spectra of the iodomethyl radical, CH(2)I, have been observed in the ground vibronic state in the frequency ranges 17-38 GHz and 200-610 GHz, respectively. The pi-electron radical was produced either by iodine abstraction from diiodomethane (CH(2)I(2)) or by hydrogen abstraction from iodomethane (CH(3...
Article
This work, besides its fundamental interest, is motivated by the atmospheric and astrophysical importance of formaldehyde (H2CO). The goal of this study is to complete the already existing list of rotational transitions within the ground vibration state by a list of transitions within the four first excited 21, 31, 41, and 61 vibrational states, to...
Article
The distribution of pollutants in two urban scale models (point emission source and street canyon with extensive transport) was investigated by means of CO(2) laser photoacoustic spectroscopy in the region of the atmospheric window (9-10 mum). The experimental results of physical modeling are in a good agreement with the numerical calculations perf...
Article
Full-text available
The submillimeter-wave spectrum of the CS+ radical cation in its ground electronic state (X2Σ+) has been observed for the first time, in a flowing positive column discharge in a CS2-Ar mixture partially cooled with a limited flow of liquid nitrogen. Nine rotational transition frequencies were recorded between 414 and 622 GHz, leading to the determi...
Article
This work, besides its fundamental interest, is motivated by the astrophysical importance of formaldehyde. For example formaldehyde was detected by millimeter techniques in Orion-KL and in several low-mass protostars }} {\textbf{526}} 845-53 (1999)}. However, no line parameters are presently available in the spectroscopic databases for the rotation...
Article
Pure rotational spectra of the bromomethyl radical, CH(2)Br, were measured by using a Fourier transform microwave (FT-MW) spectrometer in order to fully resolve hyperfine structures arising from both the bromine and hydrogen nuclei. We detected a total of 124 lines for the (79)Br and (81)Br isotopomers, including K(a)=0 (ortho species) and K(a)=1 (...
Article
We have subsequently extended the measurement of the FC16O2 radical to the lower frequency region, between 210 and 245GHz with the recently developed Prague microwave spectrometer. About 60 new a-type R-branch transitions have been observed. Our present analysis enabled us to improve significantly the determination of the ground state constants: mo...
Article
The rotational spectra of the two isotopic species of the bromomethyl radical, CH2 79Br and CH2 81Br, have been observed in their ground electronic state 2B1 in the 180-470 GHz frequency region, corresponding to a-type transitions from N=8-7 to N=21-20. The radical was produced by hydrogen abstraction of methylbromide (CH3Br) either by chlorine or...
Article
We have extended the measurement of submillimeter wave transitions of CH2Cl between 418 and 470 GHz for the two isotopic species of Cl. The radical was produced in a fast flow system by hydrogen abstraction of CH3Cl by Cl atoms obtained from a 2450 MHz microwave discharge in Cl2 diluted with helium. A global least-squares analysis including the pre...
Article
The first high resolution rotational spectrum of the bromomethyl radical in the gas phase has been observed. The radical was produced in a fast flow system by hydrogen abstraction of CH3Br by Cl or F atoms obtained from a 2450 MHz microwave discharge in Cl2 or in CF4, respectively. The rotational, quartic centrifugal distortion constants have been...
Article
We present experimental results of thermal polings performed on Suprasil I samples (Heraeus) under square alternative voltages at various frequencies. We report a large increase (×5 compared to a continuous voltage poling) of the second order non-linear coefficient within a sample poled at 1mHz.
Article
Grating growths through exposure of presensitized standard fibers to KrF light were recorded in various experimental condition. It is shown that there exists an optimum sensitization fluence at which the efficiency of the sensitization process is higher. Isochronal thermal annealing of pre-exposed fibers led to a decrease in the sensitization-induc...
Article
Carbenes play an important role in atmospheric chemistry. Among them, brominated radicals has recently received considerable attention because of their role in stratospheric ozone destruction. In 2001, $Sears^{a}$ published a theoretical and experimental study of the near-infrared spectrum of the bromomethylene radical HCBr. He obtained rotational...
Article
We have measured millimeter-wave transitions of PO, produced by the chemiluminescent reaction of oxygen with white phosphorus, P4, in excited vibrational states up to v=7. We were hence able to obtain more precise rotational, spin–rotation, Λ-doubling, and hyperfine constants for this radical and better describe their vibrational dependence. The eq...
Article
Chalcogenide glasses in the [Ge-Se-S-As] system have been synthesized and studied with respect to their nonlinear optical properties from third and second order. Z-scan and Mach Zehnder interferometry measurements of the nonlinear refractive index (n2) and nonlinear absorption ((beta) ) have been performed at 1064 nm. Some z-scan measurements have...
Article
Full-text available
Chalcogenide glasses in the [Ge-Se-S-As] system have been synthesized and studied with respect to their nonlinear optical properties from third and second order. Z-scan and Mach Zehnder interferometry measurements of the nonlinear refractive index (n2) and nonlinear absorption ((beta) ) have been performed at 1064 nm. Some z-scan measurements have...
Article
Millimeter-wave absorption spectroscopy combined with a pulsed-jet expansion technique was applied to the measurement of the rovibrational transitions of the van der Waals (vdW) bending bands of the ArDCN cluster in the frequency region of 182 ∼ 294 GHz. Sixteen and thirty-seven rovibrational lines were observed for the Σ1–Σ0 and Π1–Σ0 bands, respe...
Article
We report n millimeter-wave spectroscopic study for the vdW bending $j=2-1$ hot bands of the Ar-HCN complex. In the frequency region of 150 - 300 GHz, in total 154 rovibrational lines including hyperfine splittings for all $j=2-1$ subbands have been observed by using direct absorption spectroscopy combined with a pulsed nuzzle. The spectroscopic co...
Article
The infrared spectrum in the range 400-1600 cm(-1) of isotopically pure H(3)Si(37)Cl has been recorded at high resolution (2.4-6.6 x 10(-3) cm(-1)) and analyzed. Fifteen bands have been studied, namely the four fundamentals nu(3) (543.968 cm(-1)), nu(6) (663.738 cm(-1)), nu(2) (947.982 cm(-1)), and nu(5) (950.657 cm(-1)), the overtone bands 2nu(3),...
Article
The Ar-HBr cluster has a large amplitude intermolecular bending motion. The excited states of the van der Waals vibrations were observed by $infrared^{a}$ and far $infrared^{b}$ laser spectroscopy. The cluster has a nearly ``linear'' structure of Ar-HBr in the ground state ($\Sigma_{0}$ state), while the cluster is estimated to have a nearly ``anti...
Article
In order to understand the potential energy surface of the very floppy Ar-HCN $cluster^{a}$, it is essential to observe the van der Waals vibrational bands of the deuterated species, $Ar-DCN^{b}$. We have applied the millimeter-wave absorption spectroscopy combined with the pulsed-jet expansion technique to the measurement of ro-vibrational transit...
Article
The flash vacuum thermolysis (700–1000°C) of allylthiodi-tert−butoxysilane (2), propargylthiodi-rert−butoxysilane (3) and 1,1,3,3-tetra-tert−butoxycyclodisilthiane (4) has been investigated. In the case of 3 and 4, the β-elimination of rert-butanol and isobutene from the tert−butoxy groups was accompanied by a retro-ene reaction or dedimerization,...
Article
An investigation of the sub-millimeter-wave spectra of the ionic complexes Ar.H+3 and Ar.D+3 is presented. These complexes were produced in a negative glow electric discharge, in mixtures of argon with either H2 or D2. About 80 new transitions were assigned in the 485-680 GHz frequency range using a sub-millimeter-wave spectrometer built with Russi...
Article
For the first time submillimeter-wave transitions of an anion have been firmly identified. We observed one transition of SH− (J = 1←0, 564 421.869 MHz) and two of SD− (J = 1←0, 292 359.129 MHz; J = 2←1, 584 629.519 MHz) created in the positive column of an electric discharge set up in a mixture of H2S and argon. By studying the Doppler shift brough...
Article
In order to determine the structure and force field of silyl chloride, the infrared spectra of several isotopomers were studied. After monoisotopic $D_{3}Si^{35}Cl$ (previous communication), we report here on the analysis of the monoisotopic $H_{3}Si^{37}Cl$ species. Here too, the two fundamental bands $\nu_{3} (543.968cm^{-1})$ and $\nu_{6} (663.7...
Article
For the first time submillimeter-wave transitions of an anion have been firmly identified. One transition of $SH^{-} (J = 0 - 1, 564421.869 MHz)$ and two of $SD^{-} (J = 0 - 1, 292359.129 MHz ; J = 1 - 2, 584629.519 MHz)$ have been observed. The negative ions were created in the positive column of an electric discharge in a mixture of $H_{2}S$ and...
Article
The millimeter-wave spectrum of P2O produced by reacting P4 vapor with atomic or molecular oxygen directly inside the absorption cell has been observed in 13 vibrational states. Reliable identification of the various vibrationally excited states has been achieved with the help of high-level ab initio calculations resulting in accurate geometric dat...
Article
The ground state rotational spectrum of isobutane has been measured in selected microwave, millimeter-wave, and submillimeter-wave regions. Accurate rotational and centrifugal distortion constants up to the sextic terms have been derived from its analysis. For high-Jvalues, the splitting of the |K| = 3 transitions has been observed. AJdependence of...
Article
Silene, H2CSiH2, has been efficiently produced by pyrolysis of 5,6-bis(trifluoromethyl)- 2-silabicyclo[2.2.2]octa-5,7-diene (SBO). Seven isotopomers have been observed by millimeter- and submillimeter-wave spectroscopy. From the different sets of experimental molecular parameters and from ab initio calculations of the rovibrational interaction para...
Conference Paper
Free CH2 = SiH2 (1) has been observed in the gas phase by millimeter wave spectroscopy. A total of 142 rotational lines of the 28Si species were measured, the search being guided by recent ab initio calculations. The identification of the molecule has been confirmed by the observation of many isotopomers: H2CSiD2, H 2CSiHD, H2C29SiD2 and D 2CSiH2....
Article
139 Linien des 28Si-Isotopomers von freiem Silaethen H2CSiH21 wurden in der Gasphase mit Millimeterwellenspektroskopie beobachtet, wobei die Suche von ab-initio-Rechnungen auf MP2-, CCSD- und CCSD(T)-Niveau mit TZ2Pf-Basissatzen geleitet wurde. Die ab initio und experimentell bestimmten Rotationskonstanten von 1 mit planarer, C2v-symmetrischer Stru...
Article
Silene has been produced in the gas phase by vacuum flash pyrolysis of 5-6-bis(trifluoromethyl)-2-silabicyclo[2.2.2]octa-5,7-diene (SBO) at $600^{\circ} C^{a}$. Its rotational spectrum corresponding to a slightly asymenlzie top was observed in a liquid nitrogen cooled cell when argon was used as carrier gas. The assignment of $H_{2}CSiH_{2}$ lines...
Article
The first high resolution rotational spectrum of H2SiO in the gas phase has been obtained. This molecule was identified among several short‐lived unknown species produced by a low power ‘‘abnormal’’ glow discharge in a mixture of SiH4, O2, and Ar. On/off modulation of the discharge allowed lines belonging to each species to be characterized by thei...

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The major focus of the Laboratory of Excellence CaPPA - Chemical and Physical Properties of the Atmosphere - relies on the whole aerosol system and its precursors, allowing a better understanding of their role on the climate : radiative forcing and hydrological cycle. Additionally, the labex investigates the evolution of air quality at local, regional and global levels with specific concerns for radionuclides. It is a fundamental mission of the Labex CaPPA to further promote the northern region of France as a center of excellence in research and education. In bringing together 7 research groups, the labex CaPPA creates a multidisciplinary synergistic partnership strongly contributing to metrological innovations in the field of atmospheric environment. It therefore takes effectively part in the regional and national socio-economic development. 7 laboratories: LOA, PC2A, PhLAM, SAGE, LPCA, LASIR, ICARE