In: Bulletin of Volcanology, 2015, vol. 77, no. 12, p. 1-15
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In: Biological Invasions, 2015, vol. 17, no. 5, p. 1407-1423
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In: Applied Physics A, 2015, vol. 121, no. 3, p. 949-955
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In: Physical Review B, 2020, vol. 101, no. 12, p. 125205
Zirconium pentatetelluride, ZrTe5, shows remarkable sensitivity to hydrostatic pressure. In this work we address the high-pressure transport and optical properties of this compound, on samples grown by flux and chemical vapor transport. The high-pressure resistivity is measured up to 2 GPa, and the infrared transmission up to 9 GPa. The dc conductivity anisotropy is determined using a...
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In: Journal of Applied Crystallography, 2020, vol. 53, no. 1, p. 58–68
Silicon nanowire-based sensors find many applications in micro- and nano- electromechanical systems, thanks to their unique characteristics of flexibility and strength that emerge at the nanoscale. This work is the first study of this class of micro- and nano-fabricated silicon-based structures adopting the scanning X-ray diffraction microscopy technique for mapping the in-plane crystalline...
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In: Journal of Analytical Atomic Spectrometry, 2019, vol. 34, no. 11, p. 2325–2332
We report on novel reference-free methods to determine the instrumental resolution of transmission-type bent crystal spectrometers. The novel methods are based on the measurements of a selected X-ray line in several orders of diffraction. It is shown that the angular broadening of the spectrometer and the natural linewidth of the selected transition can be obtained directly from the novel...
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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...
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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...
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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...
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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...
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