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2 results on '"C. Ager"'

1. BEDT-TTF superconductors studied by μSR

Author

Kazushi Kanoda, Stephen Lee, I. M. Marshall, William Hayes, C. Ager, Kanetada Nagamine, Brendon W. Lovett, Feodor Y. Ogrin, Isao Watanabe, Takahiko Sasaki, Vladimir Laukhin, Stephen J. Blundell, E Laukhina, A Husmann, Naoki Toyota, S. Endo, and F.L. Pratt

Subjects
Superconductivity, Materials science, Flux pinning, Flux pumping, Condensed matter physics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, Vortex, Ion, Condensed Matter::Superconductivity, Organic superconductor, Condensed Matter::Strongly Correlated Electrons, Electrical and Electronic Engineering, Anisotropy
Abstract

Muon-spin rotation (mu SR) measurements have been used to study the superconducting vortex properties of the organic superconductors kappa-(BEDT-TTTF)(2) Cu(SCN)(2), alpha-(BEDT-TTF)(2) NH4Hg(SCN)(4) and beta-(BEDT-TTF)(2)IBr2. These materials all have highly anisotropic structures consisting of metallic layers of BEDT-TTF molecules alternating with less well conducting anion layers. Varying the anion gives rise to a change in the anisotropy of the superconductivity and also to changes in the superconducting transition temperature. We have used both transverse and longitudinal magnetic fields to study the three-dimensional flux line lattice that is present at low temperatures and fields and to study also the loss of flux lattice order that occurs on increasing the temperature and field. (C) 2000 Elsevier Science B.V. All rights reserved.

Published
2016

2. Multi-capillary-column proton-transfer-reaction time-of-flight mass spectrometry.

Author

Ruzsanyi V, Fischer L, Herbig J, Ager C, and Amann A

Subjects
Breath Tests, Gas Chromatography-Mass Spectrometry methods, Humans, Ions, Protons, Skin chemistry, Skin metabolism, Volatile Organic Compounds isolation & purification, Gas Chromatography-Mass Spectrometry instrumentation, Volatile Organic Compounds analysis
Abstract

Proton-transfer-reaction time-of-flight mass-spectrometry (PTR-TOFMS) exhibits high selectivity with a resolution of around 5000 m/Δm. While isobars can be separated with this resolution, discrimination of isomeric compounds is usually not possible. The coupling of a multi-capillary column (MCC) with a PTR-TOFMS overcomes these problems as demonstrated in this paper for the ketone isomers 3-heptanone and 2-methyl-3-hexanone and for different aldehydes. Moreover, fragmentation of compounds can be studied in detail which might even improve the identification. LODs for compounds tested are in the range of low ppbv and peak positions of the respective separated substances show good repeatability (RSD of the peak positions <3.2%). Due to its special characteristics, such as isothermal operation, compact size, the MCC setup is suitable to be installed inside the instrument and the overall retention time for a complete spectrum is only a few minutes: this allows near real-time measurements in the optional MCC mode. In contrast to other methods that yield additional separation, such as the use of pre-cursor ions other than H3O(+), this method yields additional information without increasing complexity., (Copyright © 2013 The Authors. Published by Elsevier B.V. All rights reserved.)

Published
2013
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