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1,432 Newest Publications about the topic spectrometers

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Methyl Internal Rotation in the Microwave Spectrum of Vinyl Acetate

10-12-2014 | 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

09-12-2014 | 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

04-12-2014 | 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

03-12-2014 | 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)

26-11-2014 | 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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Simple Setup for Gas-Phase H/D Exchange Mass Spectrometry Coupled to Electron Transfer Dissociation and Ion Mobility for Analysis of Polypeptide Structure on a Liquid Chromatographic Time Scale

20-11-2014 | Ulrik H. Mistarz; Jeffery M. Brown; Kim F. Haselmann; Kasper D. Rand, Analytical Chemistry, 2014

Gas-phase hydrogen/deuterium exchange (HDX) is a fast and sensitive, yet unharnessed analytical approach for providing information on the structural properties of biomolecules, in a complementary manner to mass analysis. Here, we describe a simple setup for ND3-mediated millisecond gas-phase HDX ...

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Next-Generation Proteomics: Toward Customized Biomarkers for Environmental Biomonitoring

17-11-2014 | Judith Trapp; Jean Armengaud; Arnaud Salvador; Arnaud Chaumot; Olivier Geffard, Environmental Science & Technology, 2014

Because of their ecological representativeness, invertebrates are commonly employed as test organisms in ecotoxicological assessment; however, to date, biomarkers employed for these species were the result of a direct transposition from vertebrates, despite deep evolutionary divergence. To gain ...

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[Perspective] Improving planet-finding spectrometers

14-11-2014 | Justin R. Crepp, Science , 2014

Adaptive optics will enhance the precision of exoplanet surveys Author: Justin R. Crepp

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Evaluation of a Benchtop Cryogen-Free Low-Field 1H NMR Spectrometer for the Analysis of Sexual Enhancement and Weight Loss Dietary Supplements Adulterated with Pharmaceutical Substances

10-11-2014 | Guilhem Pagès; Anna Gerdova; David Williamson; Véronique Gilard; Robert Martino; Myriam Malet-Martino, Analytical Chemistry, 2014

Nuclear magnetic resonance (NMR) spectroscopy is a unique tool for detection, structural characterization, and quantification of compounds in complex mixtures. However, due to cost constraints, NMR is rarely used in routine quality control (QC) analysis. The recent release of benchtop ...

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Automatic standardization method for Raman spectrometers with applications to pharmaceuticals

28-10-2014 | Hui Chen, Zhi‐Min Zhang, Li Miao, De‐Jian Zhan, Yi‐Bao Zheng, Yan Liu, Feng Lu, Yi‐Zeng Liang, Journal of Raman Spectroscopy, 2014

An effective and practical method, based on automatic peak detection, Lorentzian fitting, and polynomial fitting, is developed for aligning spectra, which can significantly reduce or eliminate systematic differences between Raman spectrometers. In this work, Lorentzian fitting of the ...

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