Alexandre Faure
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View article: Anatomy of the Class I protostar L1489 IRS with NOEMA
Anatomy of the Class I protostar L1489 IRS with NOEMA Open
Context . Streamers are newly identified channels that transport mass from large, molecular-cloud scales down to small, protoplanetary-disk scales. To better understand their impact on planet formation, it is essential to study their physi…
View article: Electron recombination of rotationally cold D2H+ ions
Electron recombination of rotationally cold D2H+ ions Open
Dissociative recombination (DR) of electrons with small molecular ions is a fundamental process for the physics and chemistry of the interstellar medium and planetary atmospheres. In previous DR studies, detailed analysis of the experiment…
View article: Excitation of Molecules and Atoms for Astrophysics (EMAA): A spectroscopic and collisional database
Excitation of Molecules and Atoms for Astrophysics (EMAA): A spectroscopic and collisional database Open
Context . In astrophysical environments, the energy levels of molecules, atoms, and ions are rarely populated at local thermodynamic equilibrium (LTE), that is the level populations reflect the competition between radiative and collisional…
View article: Experimental observation of quantum interferences in CO-H$_2$ rotational energy transfer at room temperature
Experimental observation of quantum interferences in CO-H$_2$ rotational energy transfer at room temperature Open
Using time-resolved infrared-vacuum-ultraviolet double-resonance spectroscopy, experimental room temperature measurements of state-to-state rate coefficients for rotational energy transfer within the X $^1Σ^+(v=2)$ vibrational state of CO …
View article: Chemistry and ro-vibrational excitation of HeH<sup>+</sup> in the Planetary Nebula NGC 7027
Chemistry and ro-vibrational excitation of HeH<sup>+</sup> in the Planetary Nebula NGC 7027 Open
Context. The helium hydride cation (HeH + ) holds the distinction of being the first molecule to form in the metal-free Universe after the Big Bang. Following its first circumstellar detection via the pure rotational J = 1 → 0 transition i…
View article: PDRs4All XI. Detection of infrared CH$^+$ and CH$_3^+$ rovibrational emission in the Orion Bar and disk d203-506: evidence of chemical pumping
PDRs4All XI. Detection of infrared CH$^+$ and CH$_3^+$ rovibrational emission in the Orion Bar and disk d203-506: evidence of chemical pumping Open
The methylidyne cation (CH$^+$) and the methyl cation (CH$_3^+$) are building blocks of organic molecules, yet their coupled formation and excitation mechanisms remain mainly unprobed. The James Webb Space Telescope (JWST), with its high s…
View article: Dissociative recombination of N$_2$H$^+$: Isotopic effects
Dissociative recombination of N$_2$H$^+$: Isotopic effects Open
The investigation of the isotopic ratio of interstellar nitrogen -- $^{14}$N versus $^{15}$N -- is done, for explaining its variations observed for N2H+ in different interstellar and Solar environments. The goal is to produce cross section…
View article: Rotational Excitation Cross Sections for Chloronium Based on a New 5D Interaction Potential with Molecular Hydrogen
Rotational Excitation Cross Sections for Chloronium Based on a New 5D Interaction Potential with Molecular Hydrogen Open
Chloronium (H2Cl+) is an important intermediate of Cl-chemistry in space. The accurate knowledge of its collisional properties allows a better interpretation of the corresponding observations in interstellar clouds an…
View article: Fate and detectability of rare gas hydride ions in nova ejecta
Fate and detectability of rare gas hydride ions in nova ejecta Open
HeH + was the first heteronuclear molecule to form in the metal-free Universe after the Big Bang. The molecule gained significant attention following its first circumstellar detection in the young and dense planetary nebula NGC 7027. We ta…
View article: Revisiting rotationally excited CH at radio wavelengths: A case study towards W51
Revisiting rotationally excited CH at radio wavelengths: A case study towards W51 Open
Context. Ever since they were first detected in the interstellar medium, the radio wavelength (3.3 GHz) hyperfine-structure splitting transitions in the rotational ground state of CH were observed to show anomalous excitation. Astonishingl…
View article: Revisiting rotationally excited CH at radio wavelengths: A case study towards W51
Revisiting rotationally excited CH at radio wavelengths: A case study towards W51 Open
Ever since they were first detected in the interstellar medium, the radio wavelength (3.3 GHz) hyperfine-structure splitting transitions in the rotational ground state of CH have been observed to show anomalous excitation. Astonishingly, t…
View article: Fate and detectability of rare gas hydride ions in nova ejecta: A case study with nova templates
Fate and detectability of rare gas hydride ions in nova ejecta: A case study with nova templates Open
HeH$^+$ was the first heteronuclear molecule to form in the metal-free Universe after the Big Bang. The molecule gained significant attention following its first circumstellar detection in the young and dense planetary nebula NGC 7027. We …
View article: Cosmic-ray induced sputtering of interstellar formaldehyde ices
Cosmic-ray induced sputtering of interstellar formaldehyde ices Open
Context. In the cold and dense regions of the interstellar medium (ISM), for example in prestellar cores, gas-phase chemical abundances undergo a steep decrease due to the freeze-out of molecules onto the dust grain surfaces. While the dep…
View article: Maser Activity of Organic Molecules toward Sgr B2(N)
Maser Activity of Organic Molecules toward Sgr B2(N) Open
At centimeter wavelengths, single-dish observations have suggested that the Sagittarius (Sgr) B2 molecular cloud at the Galactic Center hosts weak maser emission from several organic molecules, including CH 2 NH, HNCNH, and HCOOCH 3 . Howe…
View article: Theoretical study of the electron-induced vibrational excitation of H<sub>2</sub>O
Theoretical study of the electron-induced vibrational excitation of H<sub>2</sub>O Open
This study presents calculations for cross sections of the vibrational excitation of H 2 O(X 1 A 1 ) via electron impact. The theoretical approach employed here is based on first principles only, combining electron-scattering calculations …
View article: Maser Activity of Organic Molecules toward Sgr B2(N)
Maser Activity of Organic Molecules toward Sgr B2(N) Open
At centimeter wavelengths, single-dish observations have suggested that the Sagittarius (Sgr) B2 molecular cloud at the Galactic Center hosts weak maser emission from several organic molecules, including CH$_2$NH, HNCNH, and HCOOCH$_3$. Ho…
View article: The chemistry and excitation of H2 and HD in the early Universe
The chemistry and excitation of H2 and HD in the early Universe Open
We have critically reviewed the literature pertaining to reactions that are significant for the chemistry of hydrogen-, deuterium-, and helium-bearing species in the homogeneous early Universe. For each reaction rate coefficient, we provid…
View article: NLTE modelling of water-rich exoplanet atmospheres. Cooling and heating rates
NLTE modelling of water-rich exoplanet atmospheres. Cooling and heating rates Open
View article: NLTE modelling of water-rich exoplanet atmospheres. Cooling and heating rates
NLTE modelling of water-rich exoplanet atmospheres. Cooling and heating rates Open
The hydrogen and water molecules respond very differently to the collisional-radiative processes taking place in planetary atmospheres. Naturally, the question arises whether H2O-rich atmospheres are more (or less) resilient to long-term m…
View article: Anatomy of the Class I protostar L1489 IRS with NOEMA
Anatomy of the Class I protostar L1489 IRS with NOEMA Open
Context. Over the past few years, chemical studies have revealed multiple structures in the vicinity of young stellar objects (YSOs). It has become evident that specific physical conditions are associated with the emission of particular mo…
View article: H<sub>2</sub>CO and CS in diffuse clouds: Excitation and abundance
H<sub>2</sub>CO and CS in diffuse clouds: Excitation and abundance Open
Context . Diffuse interstellar clouds present an active chemistry despite their relatively low density and the ubiquitous presence of far-UV radiation. Aims . To provide constraints on the chemical processes responsible for the observed co…
View article: Protonated acetylene in the <i>z</i> = 0.89 molecular absorber toward PKS 1830-211
Protonated acetylene in the <i>z</i> = 0.89 molecular absorber toward PKS 1830-211 Open
We report the first interstellar identification of protonated acetylene, C 2 H 3 + , a fundamental hydrocarbon, in the z = 0.89 molecular absorber toward the gravitationally lensed quasar PKS 1830–211. The molecular species is identified f…
View article: Protonated acetylene in the z=0.89 molecular absorber toward PKS1830-211
Protonated acetylene in the z=0.89 molecular absorber toward PKS1830-211 Open
We report the first interstellar identification of protonated acetylene, C2H3+, a fundamental hydrocarbon, in the z=0.89 molecular absorber toward the gravitationally lensed quasar PKS1830-211. The molecular species is identified from clea…
View article: Cover Feature: Bending Relaxation of H<sub>2</sub>O by Collision with <i>Para</i>‐ and <i>Ortho</i>‐H<sub>2</sub> (ChemPhysChem 2/2024)
Cover Feature: Bending Relaxation of H<sub>2</sub>O by Collision with <i>Para</i>‐ and <i>Ortho</i>‐H<sub>2</sub> (ChemPhysChem 2/2024) Open
The Cover Feature depicts the discovery of vibrationally excited H2O in the atmosphere of a red supergiant star through the ATOMIUM ALMA Large Program. To comprehend water′s excitation in these settings, it is essential to model its excita…
View article: Scattering resonances in the rotational excitation of HDO by Ne and <i>normal</i>-H<sub>2</sub>: theory and experiment
Scattering resonances in the rotational excitation of HDO by Ne and <i>normal</i>-H<sub>2</sub>: theory and experiment Open
Crossed-molecular-beam measurements and close-coupling calculations based on high-accuracy potential energy surfaces for the HDO collisions with Ne or H 2 in the near-threshold regime.
View article: BASECOL2023 scientific content
BASECOL2023 scientific content Open
Context . The global context of making numerous data produced by researchers available requires collecting and organising the data, assigning meaningful metadata, and presenting the data in a meaningful and homogeneous way. The BASECOL dat…
View article: Bending Relaxation of H<sub>2</sub>O by Collision with <i>Para</i>‐ and <i>Ortho</i>‐H<sub>2</sub>
Bending Relaxation of H<sub>2</sub>O by Collision with <i>Para</i>‐ and <i>Ortho</i>‐H<sub>2</sub> Open
We extend our recent theoretical work on the bending relaxation of H 2 O in collisions with H 2 by including the three water modes of vibration coupled with rotation, as well as the rotation of H 2 . Our full quantum close‐coupling method …
View article: Bending relaxation of H$_2$O by collision with para- and ortho-H$_2$
Bending relaxation of H$_2$O by collision with para- and ortho-H$_2$ Open
We extend our recent theoretical work on the bending relaxation of H$_2$O in collisions with H$_2$ by including the three water modes of vibration coupled with rotation, as well as the rotation of H$_2$. Our full quantum close-coupling met…
View article: Correction to: An accurate set of H3O+ − H2 collisional rate coefficients for non-LTE modelling of warm interstellar clouds
Correction to: An accurate set of H3O+ − H2 collisional rate coefficients for non-LTE modelling of warm interstellar clouds Open
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View article: The rotational excitation of the water isotopologues by molecular hydrogen
The rotational excitation of the water isotopologues by molecular hydrogen Open
We present cross-sections and rate coefficients for rotational transitions in the water isotopologues D2O, H$_2^{18}$O, and HDO induced by collisions with para-H2(j2 = 0) and ortho-H2(j2 = 1). Quantum scattering calculations are performed …