23 results match your criteria capabilities vuv

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Spotting isomer mixtures in forensic illicit drug casework with GC-VUV using automated coelution detection and spectral deconvolution.

J Chromatogr B Analyt Technol Biomed Life Sci 2021 Mar 29;1173:122675. Epub 2021 Mar 29.

Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, PO Box 94157, Amsterdam 1090 GD, the Netherlands; Co van Ledden Hulsebosch Center (CLHC), Amsterdam Center for Forensic Science and Medicine, PO Box 94157, Amsterdam 1090 GD, the Netherlands.

Analysis of isomeric mixtures is a significant analytical challenge. In the forensic field, for example, over 1000 new psychoactive substances (NPSs), comprising of many closely related and often isomeric varieties, entered the drugs-of-abuse market within the last decade. Unambiguous identification of the isomeric form requires advanced spectroscopic techniques, such as GC-Vacuum Ultraviolet Spectroscopy (GC-VUV). Read More

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Selective identification of cyclopentaring-fused PAHs and side-substituted PAHs in a low pressure premixed sooting flame by photoelectron photoion coincidence spectroscopy.

Phys Chem Chem Phys 2020 Jul;22(28):15926-15944

Synchrotron SOLEIL, L 'Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France.

This work reports on the selective on-line identification of polycyclic aromatic hydrocarbons (PAHs) formed in a low-pressure methane sooting flame, carried out using the double imaging Photoelectron Photoion Coincidence Spectroscopy method (i2PEPICO) on the DESIRS VUV beamline at the synchrotron SOLEIL. Generally, this work demonstrates the capabilities of the i2PEPICO method to identify PAHs in sooting flames, and in particular to distinguish cyclopentaring-fused PAHs (CP-PAHs) and side-substituted PAHs from their benzenoid isomers. Experimental threshold photoelectron spectra of four CP-PAHs: acenapthylene (C12H8, 152 m/z), acenaphtene (C12H10, 154 m/z), fluoranthene (C16H10, 202 m/z) and benzo(ghi)fluoranthene (C18H10, 226 m/z) are also reported for the first time. Read More

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A pressurized flow reactor combustion experiment interfaced with synchrotron double imaging photoelectron photoion coincidence spectroscopy.

Rev Sci Instrum 2020 Apr;91(4):045115

Mass Spectrometry in Reactive Flows - Institute for Combustion and Gas Dynamics (IVG), University Duisburg-Essen, Duisburg 47057, Germany.

A new pressurized low-temperature combustion experiment has been commissioned at the Swiss Light Source, Paul Scherrer Institute. The experiment uses photoionization with tunable synchrotron radiation and double imaging photoelectron photoion coincidence (iPEPICO) detection at the vacuum ultraviolet beamline. The experimental setup is described, including the high-pressure reactor experiment, sampling interface, and reactant delivery system. Read More

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Fast beam monitor diamond-based devices for VUV and X-ray synchrotron radiation applications.

J Synchrotron Radiat 2019 Mar 13;26(Pt 2):386-392. Epub 2019 Feb 13.

Dipartimento di Fisica e Astronomia, Universitá di Firenze, Firenze, Italy.

The improved performance of third-generation light sources and the advent of next-generation synchrotron radiation facilities require the use of extremely precise monitoring of the main photon-beam parameters, such as position, absolute and relative intensity, and temporal structure. These parameters, and associated real-time feedbacks, are fundamental at the beamline control level and at the machine control level, to improve the stability of the photon beams and to provide bunch-to-bunch quantitative information. Fast response time, high radiation hardness and visible-blind response are main features of photon-beam monitors for VUV and X-ray synchrotron radiation beamlines; hence diamond-based detectors are outstanding candidates. Read More

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Hyphenation of short monolithic silica capillary column with vacuum ultraviolet spectroscopy detector for light hydrocarbons separation.

J Chromatogr A 2019 Jun 14;1595:174-179. Epub 2019 Feb 14.

Univ Lyon, CNRS, Université Claude Bernard Lyon 1, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, F-69100 Villeurbanne, France. Electronic address:

Compared to conventionnal bench top instruments, on-line GC analyzers require specific characteristics. On one hand, for some applications operating with a reactor pressure as high as several tens of bars, sample pressure has to be reduced before GC separation, or specific valves and columns have to be designed to perform separation with high carrier gas inlet pressure. On the other hand, informative detectors such as mass spectrometer are valuable but low maintenance detectors are prefered. Read More

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Vacuum Ultraviolet Spectroscopy as a New Tool for GC Analysis of Terpenes in Flavors and Fragrances.

J AOAC Int 2019 Mar 19;102(2):655-658. Epub 2018 Nov 19.

VUV Analytics, Inc - Applications, 715 Discovery Blvd, Suite 502, Cedar Park, TX 78613.

: Traditional detectors such as flame ionization detection and MS have issues with coeluting isomers like terpenes; however, unique vacuum UV (VUV) absorbance spectra can be used to deliberately compress chromatography. : Deconvolution capabilities under various run conditions of GC-MS and GC-VUV are compared. : A standard terpenes mix and tea tree essential oil were run on both GC-MS (63 and 14 min run times) and GC-VUV (22, 11, and 7 min run times). Read More

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Lifshitz analysis of dispersion forces based on quantitative reflection electron energy loss spectroscopy.

J Colloid Interface Sci 2018 Mar 27;514:625-633. Epub 2017 Dec 27.

Technical and Macromolecular Chemistry, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany.

Hypothesis: The energy loss experienced by an electron while moving through a solid is determined by the optical properties of the surrounding. Hence, quantitative Reflection Electron Energy Loss Spectroscopy (REELS) should allow the determination of optical data required for the calculation of Hamaker coefficients using Lifshitz theory. This approach might improve the accuracy of calculated Hamaker coefficients and should also enable to harness the unique capabilities of REELS to analyse nanostructured surfaces and thin-films with great spatial resolution and surface sensitivity. Read More

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Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products.

J Phys Chem A 2017 Jul 10;121(28):5280-5289. Epub 2017 Jul 10.

JILA and Department of Physics, University of Colorado , Boulder, Colorado 80309, United States.

We report the combination of tabletop vacuum ultraviolet photoionization with photoion-photoelectron coincidence spectroscopy for sensitive, isomer-specific detection of nascent products from a pyrolysis microreactor. Results on several molecules demonstrate two essential capabilities that are very straightforward to implement: the ability to differentiate isomers and the ability to distinguish thermal products from dissociative ionization. Here, vacuum ultraviolet light is derived from a commercial tabletop femtosecond laser system, allowing data to be collected at 10 kHz; this high repetition rate is critical for coincidence techniques. Read More

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Time-resolved ARPES at LACUS: Band Structure and Ultrafast Electron Dynamics of Solids.

Chimia (Aarau) 2017 May;71(5):273-277

Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne;, Email:

The manipulation of the electronic properties of solids by light is an exciting goal, which requires knowledge of the electronic structure with energy, momentum and temporal resolution. Time- and angle-resolved photoemission spectroscopy (tr-ARPES) is the most direct probe of the effects of an optical excitation on the band structure of a material. In particular, tr-ARPES in the extreme ultraviolet (VUV) range gives access to the ultrafast dynamics over the entire Brillouin zone. Read More

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Harmonium: An Ultrafast Vacuum Ultraviolet Facility.

Chimia (Aarau) 2017 May;71(5):268-272

Laboratory of Ultrafast Spectroscopy and Lausanne Centre for Ultrafast Science (LACUS) ISIC Station 6 Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne.

Harmonium is a vacuum ultraviolet (VUV) photon source built within the Lausanne Centre for Ultrafast Science (LACUS). Utilising high harmonic generation, photons from 20-110 eV are available to conduct steady-state or ultrafast photoelectron and photoion spectroscopies (PES and PIS). A pulse preserving monochromator provides either high energy resolution (70 meV) or high temporal resolution (40 fs). Read More

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Time resolved 3D momentum imaging of ultrafast dynamics by coherent VUV-XUV radiation.

Rev Sci Instrum 2016 Jun;87(6):063110

Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

We present a new experimental setup for measuring ultrafast nuclear and electron dynamics of molecules after photo-excitation and ionization. We combine a high flux femtosecond vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) source with an internally cold molecular beam and a 3D momentum imaging particle spectrometer to measure electrons and ions in coincidence. We describe a variety of tools developed to perform pump-probe studies in the VUV-XUV spectrum and to modify and characterize the photon beam. Read More

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Vacuum ultraviolet detector for gas chromatography.

Anal Chem 2014 Aug 7;86(16):8329-35. Epub 2014 Aug 7.

Department of Chemistry & Biochemistry, The University of Texas at Arlington , 700 Planetarium Place, Box 19065, Arlington, Texas 76019, United States.

Analytical performance characteristics of a new vacuum ultraviolet (VUV) detector for gas chromatography (GC) are reported. GC-VUV was applied to hydrocarbons, fixed gases, polyaromatic hydrocarbons, fatty acids, pesticides, drugs, and estrogens. Applications were chosen to feature the sensitivity and universal detection capabilities of the VUV detector, especially for cases where mass spectrometry performance has been limited. Read More

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Flame experiments at the advanced light source: new insights into soot formation processes.

J Vis Exp 2014 May 26(87). Epub 2014 May 26.

Physikalische Chemie I, Universität Bielefeld.

The following experimental protocols and the accompanying video are concerned with the flame experiments that are performed at the Chemical Dynamics Beamline of the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory(1-4). This video demonstrates how the complex chemical structures of laboratory-based model flames are analyzed using flame-sampling mass spectrometry with tunable synchrotron-generated vacuum-ultraviolet (VUV) radiation. This experimental approach combines isomer-resolving capabilities with high sensitivity and a large dynamic range(5,6). Read More

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Mass-selected IR-VUV (118 nm) spectroscopic studies of radicals, aliphatic molecules, and their clusters.

Mass Spectrom Rev 2013 Nov-Dec;32(6):484-501

MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631, China.

Mass-selected IR plus UV/VUV spectroscopy and mass spectrometry have been coupled into a powerful technique to investigate chemical, physical, structural, and electronic properties of radicals, molecules, and clusters. Advantages of the use of vacuum ultraviolet (VUV) radiation to create ions for mass spectrometry are its application to nearly all compounds with ionization potentials below the energy of a single VUV photon, its circumventing the requirement of UV chromophore group, its inability to ionize background gases, and its greatly reduced fragmenting capabilities. In this review, mass-selected IR plus VUV (118 nm) spectroscopy is introduced first in a general manner. Read More

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Core-ion temperature measurement of the ADITYA tokamak using passive charge exchange neutral particle energy analyzer.

Rev Sci Instrum 2013 Feb;84(2):023503

Institute for Plasma Research, Bhat, Gandhinagar 382 428, Gujarat, India.

Core-ion temperature measurements have been carried out by the energy analysis of passive charge exchange (CX) neutrals escaping out of the ADITYA tokamak plasma (minor radius, a = 25 cm and major radius, R = 75 cm) using a 45° parallel plate electrostatic energy analyzer. The neutral particle analyzer (NPA) uses a gas cell configuration for re-ionizing the CX-neutrals and channel electron multipliers (CEMs) as detectors. Energy calibration of the NPA has been carried out using ion-source and ΔE∕E of high-energy channel has been found to be ∼10%. Read More

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February 2013

Dopant-assisted negative photoionization ion mobility spectrometry for sensitive detection of explosives.

Anal Chem 2013 Jan 14;85(1):319-26. Epub 2012 Dec 14.

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, People's Republic of China.

Ion mobility spectrometry (IMS) is a key trace detection technique for explosives and the development of a simple, stable, and efficient nonradioactive ionization source is highly demanded. A dopant-assisted negative photoionization (DANP) source has been developed for IMS, which uses a commercial VUV krypton lamp to ionize acetone as the source of electrons to produce negative reactant ions in air. With 20 ppm of acetone as the dopant, a stable current of reactant ions of 1. Read More

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January 2013

Improved resolution of hydrocarbon structures and constitutional isomers in complex mixtures using gas chromatography-vacuum ultraviolet-mass spectrometry.

Anal Chem 2012 Mar 22;84(5):2335-42. Epub 2012 Feb 22.

Environmental Science, Policy, and Management, University of California, Berkeley, California 94720-3114, USA.

Understanding the composition of complex hydrocarbon mixtures is important for environmental studies in a variety of fields, but many prevalent compounds cannot be confidently identified using traditional gas chromatography/mass spectrometry (GC/MS) techniques. This work uses vacuum-ultraviolet (VUV) ionization to elucidate the structures of a traditionally "unresolved complex mixture" by separating components by GC retention time, t(R), and mass-to-charge ratio, m/z, which are used to determine carbon number, N(C), and the number of rings and double bonds, N(DBE). Constitutional isomers are resolved on the basis of t(R), enabling the most complete quantitative analysis to date of structural isomers in an environmentally relevant hydrocarbon mixture. Read More

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Single photon ionization and chemical ionization combined ion source based on a vacuum ultraviolet lamp for orthogonal acceleration time-of-flight mass spectrometry.

Anal Chem 2011 Jul 2;83(13):5309-16. Epub 2011 Jun 2.

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China.

A novel combined ion source based on a vacuum ultraviolet (VUV) lamp with both single photon ionization (SPI) and chemical ionization (CI) capabilities has been developed for an orthogonal acceleration time-of-flight mass spectrometer (oaTOFMS). The SPI was accomplished using a commercial 10.6 eV krypton discharge lamp with a photon flux of about 10(11) photons s(-1), while the CI was achieved through ion-molecule reactions with O(2)(+) reactant ions generated by photoelectron ionization at medium vacuum pressure (MVP). Read More

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Characterization of impurity confinement on Alcator C-Mod using a multi-pulse laser blow-off system.

Rev Sci Instrum 2011 Mar;82(3):033512

MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.

A new laser blow-off system for use in impurity transport studies on Alcator C-Mod was developed and installed for the 2009 run campaign. Its design included capabilities for multiple impurity injections during a single plasma pulse and remote manipulation of the ablated spot size. The system uses a 0. Read More

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Laser desorption postionization for imaging MS of biological material.

J Mass Spectrom 2010 Feb;45(2):137-45

Department of Chemistry, m/c 111, University of Illinois at Chicago, Chicago, IL 60607-7061, USA.

Vacuum ultraviolet single photon ionization (VUV SPI) is a soft ionization technique that has the potential to address many of the limitations of matrix-assisted laser desorption/ionization (MALDI) for imaging MS. Laser desorption postionization (LDPI) uses VUV SPI for postionization and is experimentally analogous to a MALDI instrument with the addition of a pulsed VUV light source. This review discusses progress in LDPI-MS over the last decade, with an emphasis on imaging MS of bacterial biofilms, analytes whose high salt environment make them particularly resistant to imaging by MALDI-MS. Read More

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February 2010

Vacuum ultraviolet postionization of aromatic groups covalently bound to peptides.

Anal Chem 2006 Aug;78(16):5876-83

Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA.

Experiments demonstrate that peptides with ionization potentials (IPs) above 7.87 eV can be single-photon-ionized in the gas phase with a molecular fluorine laser following prior chemical derivatization with one of several aromatic tags acting as chromophores. 4-(Dimethylamino)benzoic acid, 1-naphthylacetic acid, and 9-anthracenecarboxylic acid (denoted Benz, Naph and Anth, respectively) behave as chromophores, allowing single-photon ionization for vacuum ultraviolet (VUV) laser light by lowering the IP of the tagged peptide. Read More

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OPHELIE: a variable-polarization electromagnetic undulator optimized for a VUV beamline at Super-ACO.

J Synchrotron Radiat 1998 May 1;5(Pt 3):428-30. Epub 1998 May 1.

LURE, Bâtiment 209D, Université Paris-Sud, 91405 Orsay CEDEX, France, and CEA/DRECAM/SPAM, Bâtiment 522, CE Saclay, 91191 Gif-sur-Yvette CEDEX, France.

A planar/helical crossed overlapped undulator, called OPHELIE, is presented, composed of two identical ten-period (each 25 cm long) crossed undulators whose magnetic fields are produced by electromagnets. Such a design is quite simple, with only one mechanical translational motion, and versatile. After the presentation of the general concept of the crossed undulator and of its actual magnetic design, the expected performances in terms of flux and polarization capabilities are described. Read More

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Nondipole effects in photo-double-ionization of He by a vuv photon.

Phys Rev Lett 2004 Feb 13;92(6):063002. Epub 2004 Feb 13.

Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111, USA.

We present a dynamical model-independent, ab initio parametrization of the quadrupole transition amplitude for photo-double-ionization of He. An asymmetry of the triple differential cross section induced by the nondipole corrections is discussed and shown to be significant even for an excess energy as low as 80 eV. We provide predictions for two different kinds of experiments in which nondipole effects should be observable with current experimental capabilities. Read More

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February 2004
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