A5032927122- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Inorganic Fluorides and Related Compounds
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Various Chemistry Research Topics
- Astronomy and Astrophysical Research
- Synthesis and characterization of novel inorganic/organometallic compounds
- Chemical Reactions and Isotopes
- Atmospheric chemistry and aerosols
- Spectroscopy and Quantum Chemical Studies
- Organoboron and organosilicon chemistry
- Photocathodes and Microchannel Plates
- Photochemistry and Electron Transfer Studies
- Gas Sensing Nanomaterials and Sensors
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Field-Flow Fractionation Techniques
- Atomic and Subatomic Physics Research
Max Planck Institute for Extraterrestrial Physics
2015-2024
Scuola Normale Superiore
2021
Max Planck Society
2014-2017
University of Bologna
2015-2017
Max Planck Computing and Data Facility
2016
Harvard University
2010-2015
Center for Astrophysics Harvard & Smithsonian
2009-2015
Johannes Gutenberg University Mainz
2012
Université Toulouse III - Paul Sabatier
2008-2009
Centre National de la Recherche Scientifique
2008-2009
GEMS is an IRAM 30m Large Program whose aim determining the elemental depletions and ionization fraction in a set of prototypical star-forming regions. This paper presents first results from dark cloud TMC 1. Extensive millimeter observations have been carried out with telescope (3 mm 2 mm) 40m Yebes (1.3 cm 7 to determine fractional abundances CO, HCO
Abstract Following the discovery of dimethyl sulfide (DMS; CH 3 SCH ) signatures in comet 67P/Churyumov–Gerasimenko, we report first detection this organosulfur species interstellar medium during exploration an ultradeep molecular line survey performed toward Galactic center cloud G+0.693-0.027 with Yebes 40 m and IRAM 30 telescopes. We derive a column density N = (2.6 ± 0.3) × 10 13 cm −2 , yielding fractional abundance relative to H 2 ∼1.9 −10 . This implies that DMS is factor ∼1.6 times...
We have performed reaction product screening measurements using broadband rotational spectroscopy to identify transition matches between laboratory spectra and the Green Bank Telescope PRIMOS radio astronomy survey in Sagittarius B2 North (Sgr B2(N)). The spectrum of molecules created an electrical discharge CH3CN H2S contained several frequency unidentified features that did not molecular assignments based on standard spectral catalogs. Several these transitions are assigned E- Z-isomers...
The rotational spectrum of the higher-energy trans conformational isomer methyl formate has been assigned for first time using several pulsed-jet Fourier transform microwave spectrometers in 6-60 GHz frequency range. This species also sought toward Sagittarius B2(N) molecular cloud publicly available PRIMOS survey from Green Bank Telescope. We detect seven absorption features that coincide with laboratory transitions trans-methyl formate, which we derive a column density 3.1 (+2.6, -1.2)...
Context. Prior to star formation, pre-stellar cores accumulate matter towards the centre. As a consequence, their central density increases while temperature decreases. Understanding evolution of chemistry and physics in this early phase is crucial study processes governing formation star.
Sulphur is one of the most abundant elements in Universe. Surprisingly, sulphuretted molecules are not as expected interstellar medium, and identity main sulphur reservoir still an open question. Our goal to investigate H$_{2}$S chemistry dark clouds, this stable molecule a potential reservoir. Using millimeter observations CS, SO, H$_{2}$S, their isotopologues, we determine physical conditions abundances along cores TMC 1-C, 1-CP, Barnard 1b. The gas-grain model Nautilus then used explore...
Gas phase Elemental abundances in Molecular CloudS (GEMS) is an IRAM 30m Large Program designed to estimate the S, C, N, and O depletions gas ionization degree, X(e-), a set of star-forming filaments Taurus, Perseus Orion. Our immediate goal build up complete database molecular that can serve as observational basis for estimating X(e-) O, S through chemical modeling. We observed derived 14 species (13CO, C18O, HCO+, H13CO+, HC18O+, HCN, H13CN, HNC, HCS+, CS, SO, 34SO, H2S, OCS) 244...
<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...
Context. Low-mass protostars drive powerful molecular outflows that can be observed with mm and sub-mm telescopes. Various sulfuretted species are known to bright in shocks could used infer the physical chemical conditions throughout outflows. Aims. The evolution of sulfur chemistry is studied along driven by NGC1333-IRAS4A protobinary system located Perseus cloud constrain processes at work shocks. Methods. We various transitions from OCS, CS, SO, SO$_2$ towards 1.3, 2, 3mm bands using IRAM...
Following the discovery of dimethyl sulfide (CH$_3$SCH$_3$, DMS) signatures in comet 67P/Churyumov-Gerasimenko, we report first detection this organosulfur species interstellar medium, during exploration an ultradeep molecular line survey performed toward Galactic Center cloud G+0.693-0.027 with Yebes 40$\,$m and IRAM 30$\,$m telescopes. We derive a column density $N$ = (2.6 $\pm$ 0.3)$\times$10$^{13}$ cm$^{-2}$, yielding fractional abundance relative to H$_2$ $\sim$1.9$\times$10$^{-10}$....
We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH$_{2}$DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional the three lowest substates (e$_{0}$, e$_{1}$, o$_{1}$) this non-rigid species. A fit including 3419 wave transitions along with 43 infrared subband centers was performed root mean square deviations 0.233 MHz 0.270 cm$^{-1}$, respectively, resulting in 68 parameters. catalogue built from for...
Abstract We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH 2 DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional the three lowest substates ( e 0 , 1 o ) this nonrigid species. A fit including 3419 millimeter-wave transitions along with 43 infrared subband centers was performed rms deviations 0.233 MHz 0.270 cm −1 respectively, resulting in 68 parameters. catalog built from for temperature 125 K has...
Multiple systems are common in field stars and the frequency is found to be higher early evolutionary stages. Thus, study of young multiple during embedded stages key a comprehensive understanding star formation. In particular, way material accretes from large-scale envelope into inner region how this flow interacts with system physically chemically has not been well characterized observationally date. We aim provide snapshot forming protobinary SVS13A, consisting VLA4A VLA4B. This includes...
A variety of high-quality spectroscopic studies have contributed to knowledge the formyl cation, HCO+, and its rare isotopologues, but technical limitations previously limited precise determinations far-infrared, or terahertz spectrum. This study extends microwave, millimeter, submillimeter spectroscopy HCO+ into range. The resulting measurements predictions are sufficient coverage adequately address astrophysical questions about this species using Herschel Space Observatory Atacama Large...
Methyl formate presents a challenge for the conventional chemical mechanisms assumed to guide interstellar organic chemistry. Previous studies of potential formation pathways methyl in clouds ruled out gas-phase chemistry as major production route, and more recent kinetics models indicate that it may form efficiently from radical-radical on ice surfaces. Yet, imaging molecules potentially related its suggest through previously unexplored Motivated by these findings, two new ion-molecule...
Curiouser and curiouser: By combining high-resolution molecular spectroscopy in the centimeter millimeter wave regions, high-level coupled-cluster quantum-chemical calculations, structure of HPSi molecule has been determined. The bridged geometry is remarkable contrast to that C and/or N analogues, such as HCN/HNC, HCP, HNSi, which are all linear. Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset....
The molecular structure of trans, planar hydridotrioxygen (HOOO) has been examined by means isotopic spectroscopy using Fourier transform microwave as well microwave-millimeter-wave double resonance techniques, and high-level coupled cluster quantum-chemical calculations. Although this weakly bound molecule is readily observed in an electrical discharge H(2)O O(2) heavily diluted inert buffer gas, we find that HOOO can be produced with somewhat higher abundance H(2) precursor gases. Using...
The rotational spectrum of hydroxidooxidosulfur, HOSO, an intermediate particular interest in the combustion sulfur-rich fuels, has been determined to high accuracy from gas-phase measurements. Detection specific isotopic species using isotopically enriched gases suggests that HOSO is formed our discharge nozzle via reaction H + SO2 (+M) → (+M). A precise experimental r0 geometry also derived analysis; a cis configuration, but subtle structural question its planarity remains unresolved. From...
Context. Pre-stellar cores (PSCs) are units of star formation. Besides representing early stages the dynamical evolution leading to formation stars and planets, PSCs also provide a substrate for incipient chemical complexity in interstellar space. Aims. Our aim is understand influence external conditions on composition PSCs. For this purpose, we compared molecular column densities two typical PSCs, L183 L1544, which embedded different environments. Methods. A single-pointing survey at λ = 3...
CS is among the most abundant gas-phase S-bearing molecules in cold dark molecular clouds. It easily observable with several transitions millimeter wavelength range, and has been widely used as a tracer of gas density interstellar medium our Galaxy external galaxies. Chemical models fail to account for observed abundances when assuming cosmic value elemental abundance sulfur. The CS+O -> CO + S reaction proposed relevant destruction mechanism at low temperatures, could explain discrepancy...
The rotational spectrum of H2NCO+, the ground-state isomer protonated HNCO, has been measured in a molecular beam centimeter band with Fourier transform microwave spectrometer and low-pressure laboratory discharge absorption millimeter band. Spectroscopic constants, including nitrogen–14 hyperfine coupling constant, derived from 30 a-type transitions between 20 367 GHz J ⩽ 18 Ka 3 allow principal to be calculated 1 km s−1 or better equivalent radial velocity well into far IR. Two low-lying...
Despite the fact that many sulfur-bearing molecules, ranging from simple diatomic species up to astronomical complex have been detected in interstellar medium, sulfur chemistry space is largely unknown and a depletion abundance of S-containing has observed cold, dense medium (ISM). The chemical form missing yet be identified.