Affiner les résultats

Radiation damages during synchrotron X-ray micro-analyses of Prussian blue and zinc white historic paintings: detection, mitigation and integration

Gervais, Claire ; Thoury, Mathieu ; Réguer, Solenn ; Gueriau, Pierre ; Mass, Jennifer

In: Applied Physics A, 2015, vol. 121, no. 3, p. 949-955

Role of a higher-dimensional interaction in stabilizing charge density waves in quasi-one-dimensional ${\mathrm{NbSe}}_{3}$ revealed by angle-resolved photoemission spectroscopy

Nicholson, Christopher W. ; Schwier, Eike Fabian ; Shimada, K. ; Berger, Helmuth ; Hoesch, M. ; Berthod, C. ; Monney, Claude

In: Physical Review B, 2020, vol. 101, no. 4, p. 045412

We revisit charge density wave (CDW) behavior in the archetypal quasi-one- dimensional (quasi-1D) material NbSe3 by high-resolution angle-resolved photoemission spectroscopy measurements utilizing a microfocused laser with a photon energy of 6.3 eV. We present a detailed view of the electronic structure of this complex multiband system and unambiguously resolve CDW gaps at the Fermi level ...

Evaluation of resazurin-based rapid test to detect colistin resistance in Acinetobacter baumannii isolates

Germ, Julija ; Poirel, Laurent ; Cerar Kisek, Tjasa ; Cvitkovic Spik, Vesna ; Katja Seme ; Mueller Premru, Manica ; Lejko Zupanc, Tatjana ; Nordmann, Patrice ; Pirs, Mateja

In: European Journal of Clinical Microbiology & Infectious Diseases, 2019, vol. 38, no. 11, p. 2159–2162

Acinetobacter baumannii primarily causes colonization, yet it can be an opportunistic pathogen associated with hospital-acquired infections. Many countries report rapid spread of carbapenem-resistant Acinetobacter baumannii (CRAb) which limits treatment options, with colistin frequently being the last line treatment option. The aim of our study was to evaluate a recently developed rapid...

Diagram, valence-to-core, and hypersatellite Kβ X-ray transitions in metallic chromium

Zeeshan, Faisal ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Sokaras, Dimosthenis ; Weng, Tsu-Chien ; Alonso-Mori, Roberto ; Kavčič, Matjaz ; Guerra, Mauro ; Sampaio, Jorge Miguel ; Parente, Fernando ; Indelicato, Paul ; Marques, José Pires ; Santos, José Paulo

In: X-Ray Spectrometry, 2019, vol. 48, no. 5, p. 351–359

We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the...

In-house setup for laboratory-based x-ray absorption fine structure spectroscopy measurements

Zeeshan, Faisal ; Hoszowska, Joanna ; Loperetti-Tornay, L. ; Dousse, Jean-Claude

In: Review of Scientific Instruments, 2019, vol. 90, no. 7, p. 073105

We report on a laboratory-based facility for in-house x-ray absorption fine structure (XAFS) measurements. The device consists of a conventional x-ray source for the production of the incident polychromatic radiation and a von Hamos bent crystal spectrometer for the analysis of the incoming and transmitted radiation. The reliability of the laboratory-based setup was evaluated by comparing the...

A DuMond-type crystal spectrometer for synchrotron-based X-ray emission studies in the energy range of 15–26 keV

Jagodziński, Paweł ; Szlachetko, Jakub ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Szlachetko, Monika ; Vogelsang, U. ; Banaś, Dariusz ; Pakendorf, T. ; Meents, A. ; Bokhoven, Jeroen A. van ; Kubala-Kukuś, Aldona ; Pajek, Marek ; Nachtegaal, Maarten

In: Review of Scientific Instruments, 2019, vol. 90, no. 6, p. 063106

The design and performance of a high-resolution transmission-type X-ray spectrometer for use in the 15–26 keV energy range at synchrotron light sources is reported. Monte Carlo X-ray-tracing simulations were performed to optimize the performance of the transmission-type spectrometer, based on the DuMond geometry, for use at the Super X-ray absorption beamline of the Swiss Light Source at...

Laboratory based XAS measurements, electron-induced double K-shell ionization of Sc, Cr and Cu : and, Chemical sensitivity of photoinduced Kʰβ hypersatelite transition in Cr compounds

Zeeshan, Faisal ; Dousse, Jean-Claude (Dir.)

Thèse de doctorat : Université de Fribourg, 2017 ; no. 2052.

Cette thèse de doctorat contient trois différents projets qui appartiennent aux domaines de la physique atomique des couches profondes et de la spectroscopie de rayons X en haute résolution. Le premier projet concerne l’étude des spectres d’absorption (XAS) K et L de quelques éléments de transition 3d, 4d et 5d. Les mesures ont été réalisées à Fribourg avec le spectromètre à...

Failure and failure mechanisms of wood during longitudinal compression monitored by synchrotron micro-computed tomography

Zauner, Michaela ; Stampanoni, Marco ; Niemz, Peter

In: Holzforschung, 2016, vol. 70, no. 2, p. 179-185

Micro-Scale Restraint Methodology for Humidity Induced Swelling Investigated by Phase Contrast X-Ray Tomography

Patera, A. ; Jefimovs, K. ; Rafsanjani, A. ; Voisard, F. ; Mokso, R. ; Derome, D. ; Carmeliet, J.

In: Experimental Mechanics, 2014, vol. 54, no. 7, p. 1215-1226

Damage evolution in wood: synchrotron radiation micro-computed tomography (SRμCT) as a complementary tool for interpreting acoustic emission (AE) behavior

Baensch, Franziska ; Zauner, Michaela ; Sanabria, Sergio J. ; Sause, Markus G.R. ; Pinzer, Bernd R. ; Brunner, Andreas J. ; Stampanoni, Marco ; Niemz, Peter

In: Holzforschung, 2015, vol. 69, no. 8, p. 1015-1025