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1,437 Newest Publications about the topic spectrometers

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Method development for the determination of chromium and thallium in fertilizer samples using graphite furnace atomic absorption spectrometry and direct solid sample analysis

04-Jan-2015 | Author(s): Aline R. Borges , Luciane L. François , Emilene M. Becker , Maria Goreti R. Vale , Bernhard Welz, Microchemical Journal, 2015

Publication date: March 2015 Source:Microchemical Journal, Volume 119 Author(s): Aline R. Borges , Luciane L. François , Emilene M. Becker , Maria Goreti R. Vale , Bernhard Welz A method has been developed for the determination of chromium and thallium in fertilizer samples using line ...

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Raman spectroscopic characterization of laminated glass and transparent sheet plastics to amplify a history of early aviation ‘glass’

27-Dec-2014 | Odile Madden, Kim Cullen Cobb, Alex M. Spencer, Journal of Raman Spectroscopy, 2014

A novel, non‐invasive study of goggles, flight helmets, airplane windows, and canopies in Smithsonian collections is the first known large‐scale technical survey of historic aviation plastics and leverages the world's largest air and space collection as evidence of the materials and technologies ...

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Fast Infrared Chemical Imaging with a Quantum Cascade Laser

22-Dec-2014 | Kevin Yeh; Seth Kenkel; Jui-Nung Liu; Rohit Bhargava, Analytical Chemistry, 2014

Infrared (IR) spectroscopic imaging systems are a powerful tool for visualizing molecular microstructure of a sample without the need for dyes or stains. Table-top Fourier transform infrared (FT-IR) imaging spectrometers, the current established technology, can record broadband spectral data ...

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Polymer Micronozzle Array for Multiple Electrosprays Produced by Templated Synthesis and Etching of Microstructured Fibers

18-Dec-2014 | Yueqiao Fu; Graham T. T. Gibson; Antoine Proulx; André Croteau; Bradley B. Schneider; Thomas R. Covey; Richard D. Ol ..., Analytical Chemistry, 2014

Microstructured fibers (MSFs) having raised polymer nozzles in each channel are custom designed, fabricated, and tested for use as multiple electrospray (MES) emitters for mass spectrometry (MS). There is strong motivation to develop electrospray emitters that operate at practical flow rates but ...

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Development of an ion activation stage for atmospheric pressure ionization sources

15-Dec-2014 | Sonja Klee, Albrecht Brockhaus, Walter Wißdorf, Marco Thinius, Nele Hartmann, Thorsten Benter, Rapid Communications in Mass Spectrometry, 2014

RATIONALE The ion‐molecule chemistry in typical atmospheric pressure ion sources is essentially thermodynamically controlled. Methods relying on gas‐phase protonation reactions, e.g. atmospheric pressure chemical ionization (APCI), thus suffer from the low reactivity of the equilibrated ...

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Methyl Internal Rotation in the Microwave Spectrum of Vinyl Acetate

10-Dec-2014 | Ha Vinh Lam Nguyen; Atef Jabri; Vinh Van; Wolfgang Stahl, Journal of Physical Chemistry A, 2014

The rotational spectrum of vinyl acetate, CH3(CO)OCH═CH2, was measured using two molecular beam Fourier transform microwave spectrometers operating in the frequency range from 2 to 40 GHz. Large splittings up to 2 GHz occurred due to the internal rotation of the acetyl methyl group CH3CO with a ...

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Uptake of Epoxydiol Isomers Accounts for Half of the Particle-Phase Material Produced from Isoprene Photooxidation via the HO2 Pathway

09-Dec-2014 | Yingjun Liu; Mikinori Kuwata; Benjamin F. Strick; Franz M. Geiger; Regan J. Thomson; Karena A. McKinney; Scot T. Martin, Environmental Science & Technology, 2014

The oxidation of isoprene is a globally significant source of secondary organic material (SOM) of atmospheric particles. The relative importance of different parallel pathways, however, remains inadequately understood and quantified. SOM production from isoprene photooxidation was studied under ...

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Membrane Introduction Mass Spectrometry (MIMS): A Versatile Tool for Direct, Real‐Time Chemical Measurements

04-Dec-2014 | E. T. Krogh, C. G. Gill, Journal of Mass Spectrometry, 2014

Membrane introduction (or inlet) mass spectrometry (MIMS) is a direct, on‐line analytical technique, requiring that the mass spectrometer resolve analytes in the mixture based upon their m/z, their ionization characteristics and/or by mass spectrometry techniques. The coupling of semi‐permeable ...

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NMR Flow Tube for Online NMR Reaction Monitoring

03-Dec-2014 | David A. Foley; Eckhard Bez; Anna Codina; Kimberly L. Colson; Michael Fey; Robert Krull; Don Piroli; Mark T. Zell; B ..., Analytical Chemistry, 2014

In this paper we describe the development of a 5 mm NMR flow tube that can be used in a standard 5 mm NMR probe, enabling the user to conduct experiments on flowing samples or, more specifically, on flowing reaction mixtures. This enables reaction monitoring or kinetic experiments to be conducted ...

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In situ analysis with portable Raman and ED‐XRF spectrometers for the diagnosis of the formation of efflorescence on walls and wall paintings of the Insula IX 3 (Pompeii, Italy)

26-Nov-2014 | Juan Manuel Madariaga, Maite Maguregui, Silvia Fdez‐Ortiz De Vallejuelo, Ulla Knuutinen, Kepa Castro, Irantzu Martin ..., Journal of Raman Spectroscopy, 2014

This work presents the results of field Raman analyses, assisted by a hand‐held energy dispersive X‐ray fluorescence spectrometer, for the experimental determination of efflorescence from walls and wall paintings of two Pompeian houses, one with many luxurious decorative elements (House of ...

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