Journal ArticleDOI
DESIRS: a state‐of‐the‐art VUV beamline featuring high resolution and variable polarization for spectroscopy and dichroism at SOLEIL
Laurent Nahon,Nelson de Oliveira,Gustavo A. Garcia,J. F. Gil,Bertrand Pilette,Olivier Marcouillé,Bruno Lagarde,François Polack +7 more
TLDR
DESIRS as discussed by the authors is a new undulator-based VUV beamline optimized for gas-phase studies of molecular and electronic structures, reactivity and polarization-dependent photodynamics on model or actual systems encountered in the universe, atmosphere and biosphere.Abstract:
DESIRS is a new undulator-based VUV beamline on the 2.75 GeV storage ring SOLEIL (France) optimized for gas-phase studies of molecular and electronic structures, reactivity and polarization-dependent photodynamics on model or actual systems encountered in the universe, atmosphere and biosphere. It is equipped with two dedicated endstations: a VUV Fourier-transform spectrometer (FTS) for ultra-high-resolution absorption spectroscopy (resolving power up to 106) and an electron/ion imaging coincidence spectrometer. The photon characteristics necessary to fulfill its scientific mission are: high flux in the 5–40 eV range, high spectral purity, high resolution, and variable and well calibrated polarizations. The photon source is a 10 m-long pure electromagnetic variable-polarization undulator producing light from the very near UV up to 40 eV on the fundamental emission with tailored elliptical polarization allowing fully calibrated quasi-perfect horizontal, vertical and circular polarizations, as measured with an in situ VUV polarimeter with absolute polarization rates close to unity, to be obtained at the sample location. The optical design includes a beam waist allowing the implementation of a gas filter to suppress the undulator high harmonics. This harmonic-free radiation can be steered toward the FTS for absorption experiments, or go through a highly efficient pre-focusing optical system, based on a toroidal mirror and a reflective corrector plate similar to a Schmidt plate. The synchrotron radiation then enters a 6.65 m Eagle off-plane normal-incidence monochromator equipped with four gratings with different groove densities, from 200 to 4300 lines mm−1, allowing the flux-to-resolution trade-off to be smoothly adjusted. The measured ultimate instrumental resolving powers are 124000 (174 µeV) around 21 eV and 250000 (54 µeV) around 13 eV, while the typical measured flux is in the 1010–1011 photons s−1 range in a 1/50000 bandwidth, and 1012–1013 photons s−1 in a 1/1000 bandwidth, which is very satisfactory although slightly below optical simulations. All of these features make DESIRS a state-of-the-art VUV beamline for spectroscopy and dichroism open to a broad scientific community.read more
Citations
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Journal ArticleDOI
Ribose and related sugars from ultraviolet irradiation of interstellar ice analogs
Cornelia Meinert,Iuliia Myrgorodska,Pierre de Marcellus,Thomas Buhse,Laurent Nahon,Søren Vrønning Hoffmann,Louis Le Sergeant d'Hendecourt,Uwe J. Meierhenrich +7 more
TL;DR: The detection of ribose provides plausible insights into the chemical processes that could lead to formation of biologically relevant molecules in suitable planetary environments and suggests that the generation of numerous sugar molecules, including the aldopentose ribose, may be possible from photochemical and thermal treatment of cosmic ices in the late stages of the solar nebula.
Journal ArticleDOI
Photochemistry and astrochemistry: photochemical pathways to interstellar complex organic molecules
TL;DR: The effects of UV radiation is compared with those of three other potential sources of radical production and chemistry in interstellar ices: electrons, ions, and X-rays.
Journal ArticleDOI
UV Photodesorption of Methanol in Pure and CO-rich Ices : Desorption Rates of the Intact Molecule and of the Photofragments
M. Bertin,Claire Romanzin,Mikhail Doronin,Laurent Philippe,P. Jeseck,Niels F. W. Ligterink,Harold Linnartz,X. Michaut,Jean-Hugues Fillion +8 more
TL;DR: In this paper, the VUV photodesorption rate of intact methanol molecules from pure and mixed methanols is found to be of the order of 10$^{-5}$ molecules/photon, that is two orders of magnitude below what is generally used in astrochemical models.
Journal ArticleDOI
DELICIOUS III: A multipurpose double imaging particle coincidence spectrometer for gas phase vacuum ultraviolet photodynamics studies
TL;DR: A versatile double imaging particle coincidence spectrometer operating in fully continuous mode, named DELICIOUS III, which combines a velocity map imaging device and a modified Wiley-McLaren time of flight momentum imaging analyzer for photoelectrons and photoions, respectively.
Journal ArticleDOI
UV photodesorption of methanol in pure and CO-rich ices: desorption rates of the intact molecule and of the photofragments
Mathieu Bertin,Claire Romanzin,Mikhail Doronin,Laurent Philippe,Pascal Jeseck,Niels Litgerink,Harold Linnartz,Xavier Michaut,Jean-Hugues Fillion +8 more
TL;DR: In this article, the VUV photodesorption rate of intact methanol molecules from pure and mixed methanols is found to be of the order of 10$^{-5}$ molecules/photon, that is two orders of magnitude below what is generally used in astrochemical models.
References
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Journal ArticleDOI
Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen
TL;DR: In this paper, the photodissociation processes occurring in molecular oxygen following the two-photon 3dπ(3Σ1g −) Rydberg excitation around 225 nm are presented to show the improvement in spatial resolution in the ion and electron images.
Journal ArticleDOI
Vacuum ultraviolet beamline at the Swiss Light Source for chemical dynamics studies
TL;DR: A bend-magnet vacuum ultraviolet (VUV) beamline, intended for chemical dynamics studies, was constructed and brought into operation at the Swiss Light Source (SLS) of the Paul Scherrer Institut.
Journal ArticleDOI
Performance of the vacuum ultraviolet high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source
Philip Heimann,M. Koike,C.-W. Hsu,D. Blank,X. Yang,X. Yang,Arthur G. Suits,Yuan T. Lee,Yuan T. Lee,M. Evans,Cheuk-Yiu Ng,C. Flaim,Howard A. Padmore +12 more
TL;DR: In this article, an undulator beamline, with an energy range from 6 to 30 eV, has been constructed for chemical dynamics experiments, where the higher harmonics of the undulator are suppressed by a novel, windowless gas filter.
Journal ArticleDOI
Non-racemic amino acid production by ultraviolet irradiation of achiral interstellar ice analogs with circularly polarized light
Pierre de Marcellus,Cornelia Meinert,Michel Nuevo,Jean-Jacques Filippi,Grégoire Danger,D. Deboffle,Laurent Nahon,Louis D'Hendecourt,Uwe J. Meierhenrich +8 more
TL;DR: In this paper, the first abiotic cosmic ice simulation experiments that produce species with enantiomeric excesses (e.g., 1.34% for (13C)-alanine) were reported.
Journal ArticleDOI
DISCO: a low-energy multipurpose beamline at synchrotron SOLEIL.
Alexandre Giuliani,Frédéric Jamme,Valérie Rouam,Frank Wien,Jean-Luc Giorgetta,Bruno Lagarde,Oleg Chubar,Stéphane Bac,Isabelle Yao,Solène Rey,Christian Herbeaux,J.-L. Marlats,D. Zerbib,François Polack,Matthieu Réfrégiers +14 more
TL;DR: The DISCO design and concept of three experimental stations serving research communities in biology and chemistry are described, with emphasis has been put on high flux generation and preservation of polarization at variable energy resolutions.