Université de Fribourg

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...

Université de Fribourg

Charge migration and charge transfer in molecular systems

Wörner, Hans Jakob ; Arrell, a), Christopher A. ; Banerji, Natalie ; Cannizzo, Andrea ; Chergui, Majed ; Das, Akshaya K. ; Hamm, Peter ; Keller, Ursula ; Kraus, Peter M. ; Liberatore, Elisa ; Lopez-Tarifa, Pablo ; Lucchini, Matteo ; Meuwly, Markus ; Milne, Chris ; Moser, Jacques-E. ; Rothlisberger, Ursula ; Smolentsev, Grigory ; Teuscher, Joël ; Bokhoven, Jeroen A. van ; Wenger, Oliver

In: Structural Dynamics, 2017, vol. 4, no. 6, p. 061508

The transfer of charge at the molecular level plays a fundamental role in many areas of chemistry, physics, biology and materials science. Today, more than 60 years after the seminal work of R. A. Marcus, charge transfer is still a very active field of research. An important recent impetus comes from the ability to resolve ever faster temporal events, down to the attosecond time scale. Such...

Université de Fribourg

Distribution of aluminum over different T-sites in ferrierite zeolites studied with aluminum valence to core X-ray emission spectroscopy

Bohinc, R. ; Hoszowska, Joanna ; Dousse, Jean-Claude ; B³achucki, Wojciech Maria ; Zeeshan, Faisal ; Kayser, Yves ; Nachtegaal, Maarten ; Pinar, A. B. ; Bokhoven, Jeroen A. van

In: Physical Chemistry Chemical Physics, 2017, vol. 19, no. 43, p. 29271–29277

The potential of valence to core Al X-ray emission spectroscopy to determine aluminum distribution in ferrierite zeolites was investigated. The recorded emission spectra of four samples prepared with different structure directing agents exhibit slight variations in the position of the main emission peak and the intensity of its low energy shoulder. Theoretical calculations indicate that an...

Université de Fribourg

Establishing nonlinearity thresholds with ultraintense X-ray pulses

Szlachetko, Jakub ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Nachtegaal, Maarten ; Błachucki, Wojciech ; Kayser, Yves ; Sà, Jacinto ; Messerschmidt, Marc ; Boutet, Sebastien ; Williams, Garth J. ; David, Christian ; Smolentsev, Grigory ; Bokhoven, Jeroen A. van ; Patterson, Bruce D. ; Penfold, Thomas J. ; Knopp, Gregor ; Pajek, Marek ; Abela, Rafael ; Milne, Christopher J.

In: Scientific Reports, 2016, vol. 6, p. 33292

X-ray techniques have evolved over decades to become highly refined tools for a broad range of investigations. Importantly, these approaches rely on X-ray measurements that depend linearly on the number of incident X-ray photons. The advent of X-ray free electron lasers (XFELs) is opening the ability to reach extremely high photon numbers within ultrashort X-ray pulse durations and is leading...