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1,478 Newest Publications about the topic spectrometers

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Preparation and Characterization of Primary Magnesium Mixtures for the ab initio Calibration of Absolute Magnesium Isotope Ratio Measurements

26-Aug-2015 | Björn Brandt; Jochen Vogl; Janine Noordmann; Angela Kaltenbach; Olaf Rienitz, Journal of Analytical Atomic Spectrometry, 2015

We report about an appropriate preparation of binary isotope calibration mixtures of the three stable isotopes of magnesium to be used in the ab initio calibration of multicollector mass spectrometers (ICPMS and TIMS). For each of the three possible combinations of binary mixtures (“²⁴Mg”+”²⁵Mg”, ...

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Untargeted Metabolomics in Doping Control: Detection of New Markers of Testosterone Misuse by Ultrahigh Performance Liquid Chromatography Coupled to High-Resolution Mass Spectrometry

05-Aug-2015 | Montse Raro; María Ibáñez; Rubén Gil; Andreu Fabregat; Eva Tudela; Koen Deventer; Rosa Ventura; Jordi Segura; Josep ..., Analytical Chemistry, 2015

The use of untargeted metabolomics for the discovery of markers is a promising and virtually unexplored tool in the doping control field. Hybrid quadrupole time-of-flight (QTOF) and hybrid quadrupole Orbitrap (Q Exactive) mass spectrometers, coupled to ultrahigh pressure liquid chromatography, ...

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Advancement of Atmospheric-Vacuum Interfaces for Mass Spectrometers with a Focus on Increasing Gas Throughput for Improving Sensitivity

05-Aug-2015 | Satendra Prasad; Eloy R. Wouters; Jean-Jacques Dunyach, Analytical Chemistry, 2015

Ion sampling from an electrospray ionization (ESI) source was improved by increasing gas conductance of the MS inlet by 4.3-fold. Converting the gas throughput (Q) into sensitivity improvement was dependent on ion desolvation and handling of the gas load. Desolvation was addressed by using a ...

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A high‐resolution accurate mass (HR/AM) approach to identification, profiling and characterization of in vitro nefazodone metabolites using a hybrid quadrupole Orbitrap (Q‐Exactive)

29-Jul-2015 | Simon J. Perry, Szilárd Nász, Mansoor Saeed, Rapid Communications in Mass Spectrometry, 2015

Rationale This paper describes a strategy for the profiling and identification of metabolites based on chemical group classification using high‐resolution accurate mass (HR/AM) full scan mass spectrometry (MS) and All‐Ion fragmentation (AIF) MS2 data. Methods The proposed strategy uses ...

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Standardless Quantification of Heavy Elements by Electron Probe Microanalysis

21-Jul-2015 | Aurélien Moy; Claude Merlet; Olivier Dugne, Analytical Chemistry, 2015

Absolute Mα and Mβ X-ray intensities were measured for the elements Pt, Au, Pb, U, and Th by electron impact for energies ranging from 6 to 38 keV. Experimental data were obtained by measuring the X-ray intensity emitted from bulk samples with an electron microprobe using high-resolution ...

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Corrections

16-Jul-2015 | ;, Nature, 2015

Corrections Nature 523, 7560 (2015). http://www.nature.com/doifinder/10.1038/523269a The News Feature ‘Weighing the world’s trees’ (Nature523, 20–22; 2015) incorrectly described the photosynthesis measurements made by the Orbiting Carbon ...

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Field Switching Combined with Bradbury–Nielsen Gate for Ion Mobility Spectrometry

15-Jul-2015 | Chuang Chen; Mahmoud Tabrizchi; Weiguo Wang; Haiyang Li, Analytical Chemistry, 2015

Bradbury–Nielsen gate (BNG) is commonly used in ion mobility spectrometers. It, however, transmits only a small fraction of the ions into the drift region, typically 1%. In contrast, all ions in the ionization chamber could be efficiently compressed into the drift region by the field switching ...

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Behavior of Supported Palladium Oxide Nanoparticles under Reaction Conditions, Studied with near Ambient Pressure XPS

15-Jul-2015 | Astrid Jürgensen; Niels Heutz; Hannes Raschke; Klaus Merz; Roland Hergenröder, Analytical Chemistry, 2015

Near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is a promising method to close the “pressure gap”, and thus, study the surface composition during heterogeneous reactions in situ. The specialized spectrometers necessary for this analytical technique have recently been adapted to ...

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Forensic Mass Spectrometry

10-Jul-2015 | William D. Hoffmann; Glen P. Jackson, Annual Review of Analytical Chemistry, 2015

Developments in forensic mass spectrometry tend to follow, rather than lead, the developments in other disciplines. Examples of techniques having forensic potential born independently of forensic applications include ambient ionization, imaging mass spectrometry, isotope ratio mass spectrometry, ...

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Evolution of Orbitrap Mass Spectrometry Instrumentation

10-Jul-2015 | Shannon Eliuk; Alexander Makarov, Annual Review of Analytical Chemistry, 2015

We discuss the evolution of OrbitrapTM mass spectrometry (MS) from its birth in the late 1990s to its current role as one of the most prominent techniques for MS. The Orbitrap mass analyzer is the first high-performance mass analyzer that employs trapping of ions in electrostatic fields. Tight ...

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