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Université de Fribourg

Real time determination of the electronic structure of unstable reaction intermediates during Au₂O₃ Reduction

Szlachetko, Jakub ; Sá, Jacinto ; Nachtegaal, Maarten ; Hartfelder, Urs ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Fernandes, Daniel Luis Abreu ; Shi, Hongqing ; Stampfl, Catherine

In: The Journal of Physical Chemistry Letters, 2014, vol. 5, no. 1, p. 80–84

Chemical reactions are always associated with electronic structure changes of the involved chemical species. Determining the electronic configuration of an atom allows probing its chemical state and gives understanding of the reaction pathways. However, often the reactions are too complex and too fast to be measured at in situ conditions due to slow and/or insensitive experimental techniques. A...

Université de Fribourg

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Kayser, Yves ; Błachucki, W. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Neff, M. ; Romano, V.

In: Review of Scientific Instruments, 2014, vol. 85, no. 4, p. 043101

The high-resolution von Hamos bent crystal spectrometer of the University of Fribourg was upgraded with a focused X-ray beam source with the aim of performing micro-sized X-ray fluorescence (XRF) measurements in the laboratory. The focused X-ray beam source integrates a collimating optics mounted on a low-power micro-spot X-ray tube and a focusing polycapillary half-lens placed in front of the...

Université de Fribourg

The electronic structure of matter probed with a single femtosecond hard x-ray pulse

Szlachetko, Jakub ; Milne, a), C. J. ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Błachucki, W. ; Sà, J. ; Kayser, Yves ; Messerschmidt, M. ; Abela, R. ; Boutet, S. ; David, Christian ; Williams, G. ; Pajek, M. ; Patterson, B. D. ; Smolentsev, G. ; Bokhoven, J. A. van ; Nachtegaal, M.

In: Structural Dynamics, 2014, vol. 1, no. 2, p. 021101

Physical, biological, and chemical transformations are initiated by changes in the electronic configuration of the species involved. These electronic changes occur on the timescales of attoseconds (10−18 s) to femtoseconds (10−15 s) and drive all subsequent electronic reorganization as the system moves to a new equilibrium or quasi-equilibrium state. The ability to detect the dynamics of...

Université de Fribourg

Satellite and hypersatellite structures of Lα1,2 and Lβ1 x-ray transitions in mid-Z atoms multiply ionized by fast oxygen ions

Czarnota, M. ; Banaś, D. ; Berset, Michel ; Chmielewska, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Mauron, Olivier ; Pajek, M. ; Polasik, M. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Słabkowska, K. ; Sujkowski, Z.

In: Physical Review A, 2014, vol. 88, no. 5, p. 052505

A detailed investigation of the Lα1,2 (L3→M4,5) and Lβ1 (L2→M4) x-ray satellite and hypersatellite structures in zirconium, molybdenum, and palladium atoms multiply ionized by impact with 278.6-MeV oxygen ions is reported. The x-ray spectra were measured with a high-resolution von Hamos bent crystal spectrometer. For the interpretation of the complex spectral features, relativistic...

Université de Fribourg

Reexamination of M2,3 atomic level widths and L1M2,3 transition energies of elements 69≤Z≤95

Fennane, Karima ; Berset, Michel ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Raboud, Pierre-Alexandre ; Campbell, J.L..

In: Physical Review A, 2014, vol. 88, no. 5, p. 052506

We report on high-resolution measurements of the photoinduced L1M2 and L1M3 x-ray emission lines of 69Tm, 70Yb, 71Lu, 73Ta, 74W, 75Re, 77Ir, 81Tl, 83Bi, and 95Am. From the linewidths of the measured transitions an accurate set of M2 and M3 level widths is determined assuming for the L1 level widths the values reported by Raboud [P.-A. Raboud et al., Phys. Rev. A 65, 022512 (2002)]. Furthermore,...

Université de Fribourg

High-resolution Laue-type DuMond curved crystal spectrometer

Szlachetko, Monika ; Berset, Michel ; Dousse, Jean-Claude ; Hoszowska, J. ; Szlachetko, Jakoub

In: Review of Scientific Instruments, 2013, vol. 84, no. 9, p. 093104

We report on a high-resolution transmission-type curved crystal spectrometer based on the modified DuMond slit geometry. The spectrometer was developed at the University of Fribourg for the study of photoinduced X-ray spectra. K and L X-ray transitions with energies above about 10 keV can be measured with an instrumental resolution comparable to their natural linewidths. Construction details and...

Université de Fribourg

Investigation of surface nanostructures with grazing angle x-ray fluorescence techniques

Nowak, Stanisław H. ; Dousse, Jean-Claude (Dir.)

Thèse de doctorat : Université de Fribourg, 2012 ; no. 1768.

The present Ph.D. thesis was realized in the Atomic and X-Ray Physics (AXP) research group of Prof. Jean-Claude Dousse at the Physics Department of the University of Fribourg. It is devoted to the development of high-resolution X-Ray Fluorescence (XRF) methods at grazing angles, namely the Grazing Emission (GEXRF) and Grazing Incidence (GIXRF) X-Ray Fluorescence methods. These grazing angle...