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1,463 Newest Publications about the topic spectrometers

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External-Cavity Quantum Cascade Laser Spectroscopy for Mid-IR Transmission Measurements of Proteins in Aqueous Solution

19-Jun-2015 | Mirta R. Alcaráz; Andreas Schwaighofer; Christian Kristament; Georg Ramer; Markus Brandstetter; Héctor Goicoechea; B ..., Analytical Chemistry, 2015

In this work, we report mid-IR transmission measurements of the protein amide I band in aqueous solution at large optical paths. A tunable external-cavity quantum cascade laser (EC-QCL) operated in pulsed mode at room temperature allowed one to apply a path length of up to 38 μm, which is four ...

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Evaluation of portable Raman instruments with 532 and 785‐nm excitation for identification of zeolites and beryllium containing silicates

10-Jun-2015 | Jan Jehlička, Peter Vandenabeele, Journal of Raman Spectroscopy, 2015

In this short paper we present Raman spectra of minerals of the group of zeolites and beryllium containing silicates (thomsonite, stilbite, natrolite, euclase, phenakite, bavenite, milarite and beryl) obtained indoors/outdoors on a collection of samples using a portable 532‐nm/785‐nm systems. ...

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Room Temperature Cation Exchange Reaction in Nanocrystals for Ultrasensitive Speciation Analysis of Silver Ions and Silver Nanoparticles

10-Jun-2015 | Ke Huang; Kailai Xu; Jie Tang; Lu Yang; Jingrong Zhou; Xiandeng Hou; Chengbin Zheng, Analytical Chemistry, 2015

To evaluate the toxicity of silver nanoparticles (AgNPs) and Ag+ and gain deep insight into the transformation of AgNPs in the environment or organisms, ultrasensitive analytical methods are needed for their speciation analysis. About 40-fold of Cd2+ in CdTe ionic nanocrystals can be ...

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Performance Assessment in Fingerprinting and Multi Component Quantitative NMR Analyses

10-Jun-2015 | Vito Gallo; Nicola Intini; Piero Mastrorilli; Mario Latronico; Pasquale Scapicchio; Maurizio Triggiani; Vitoantonio ..., Analytical Chemistry, 2015

An interlaboratory comparison (ILC) was organized with the aim to set up quality control indicators suitable for multicomponent quantitative analysis by nuclear magnetic resonance (NMR) spectroscopy. A total of 36 NMR data sets (corresponding to 1260 NMR spectra) were produced by 30 participants ...

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Modeling the Charging of Highly Oxidized Cyclohexene Ozonolysis Products Using Nitrate-Based Chemical Ionization

09-Jun-2015 | Noora Hyttinen; Oona Kupiainen-Määttä; Matti P. Rissanen; Mikko Muuronen; Mikael Ehn; Theo Kurtén, Journal of Physical Chemistry A, 2015

Several extremely low volatility organic compounds (ELVOCs) formed in the ozonolysis of endocyclic alkenes have recently been detected in laboratory and field studies. These experiments have been carried out with chemical ionization atmospheric pressure interface time-of-flight mass spectrometers ...

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Applications of DART‐MS for food quality and safety assurance in food supply chain

14-May-2015 | Tianyang Guo, Wei Yong, Yong Jin, Liya Zhang, Jiahui Liu, Sai Wang, Qilong Chen, Yiyang Dong, Haijia Su, Tianwei Tan, Mass Spectrometry Reviews, 2015

Direct analysis in real time (DART) represents a new generation of ion source which is used for rapid ionization of small molecules under ambient conditions. The combination of DART and various mass spectrometers allows analyzing multiple food samples with simple or no sample treatment, or in ...

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Raman spectra of water in fluid inclusions: I. Effect of host mineral birefringence on salinity measurement

12-May-2015 | Marie‐Camille Caumon, Alexandre Tarantola, Régine Mosser‐Ruck, Journal of Raman Spectroscopy, 2015

Raman microspectrometry of water in individual aqueous fluid inclusions can provide chemical information about fluid composition, in particular the concentration of chloride ions. The regular method consists in correlating the deformation of the OH stretching vibration band of liquid water in ...

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Fully Resolved NMR Correlation Spectroscopy

04-May-2015 | Daisy Pitoux, Bertrand Plainchont, Denis Merlet, Zhaoyu Hu, David Bonnaffé, Jonathan Farjon, Nicolas Giraud, Chemistry - A European Journal, 2015

Abstract A new correlation experiment cited as “push‐G‐SERF” is reported. In the resulting phased 2D spectrum, the chemical shift information is selected along the direct dimension, whereas scalar couplings involving a selected proton nucleus are edited in the indirect domain. The robustness ...

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Chemical Characterization of Pyrolysis Bio-oil: Application of Orbitrap Mass Spectrometry

04-May-2015 | Martin Staš; Josef Chudoba; David Kubička; Milan Pospíšil, Energy & Fuels, 2015

Pyrolysis bio-oil is a liquid product of the pyrolysis of biomass. After appropriate upgrading, it can be used as biofuel or as a source of valuable chemicals. To optimize a pyrolysis process, a detailed understanding of the chemical composition of bio-oils is necessary. Nonvolatile and ...

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Feasibility study of ED‐XRF analysis of atmospheric particulate matter samples collected with high time resolution

28-Apr-2015 | M. Giannoni, G. Calzolai, M. Chiari, F. Lucarelli, A. Mazzinghi, S. Nava, C. Ruberto, X-Ray Spectrometry, 2015

This study aims at verifying the feasibility of the analysis of particulate matter samples collected with hourly time resolution by a Streaker sampler device, using cheaper and more affordable instrumentations like energy dispersive X‐ray fluorescence (ED‐XRF) spectrometers. The ‘hourly’ samples ...

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