Université de Fribourg

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.

The present PhD thesis includes three different projects which belong to the domain of inner-shell atomic physics and high energy resolution X-ray spectroscopy. The first project consists of a series of in-house measurements of the characteristic K and L X-ray absorption spectra (XAS) of several 3d, 4d and 5d transition metals. For this project the target chamber of the von Hamos curved crystal...

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...

Université de Fribourg

Synchrotron radiation based high–resolution grazing emission X–ray fluorescence

Kayser, Yves ; Dousse, Jean-Claude (Dir.)

Thèse de doctorat : Université de Fribourg, 2011 ; no 1717.

Photo–induced surface–sensitive X–ray fluorescence measurements can be realized by different means. One can either irradiate the sample with a collimated primary X–ray beam at shallow incidence angles (0 to 2 degrees) relatively to the surface, or alternatively detect the X–ray fluorescence under well–defined shallow emission angles relatively to the sample surface. The first case...

Université de Fribourg

Two non-destructive neutron inspection techniques : prompt gamma-ray activation analysis and cold neutron tomography

Baechler, Sébastien ; Dousse, Jean-Claude (Dir.) ; Jolie, Jan (Codir.)

Thèse de doctorat : Université de Fribourg, 2002 ; no 1381.

Two non-destructive inspection techniques employing both cold neutron beams have been developed at the Swiss spallation source SINQ of the Paul Scherrer Institute: (1) prompt gamma-ray activation analysis (PGAA) and (2) neutron tomography. PGAA is a nuclear analytical method for identifying and quantifying simultaneously the elements contained in a sample. The technique consists in detecting...

Université de Fribourg

Atomic level widths and shake probabilities as inferred from high-resolution measurements of x-ray emission spectra

Raboud, Pierre-Alexandre ; Dousse, Jean-Claude (Dir.) ; Weis, Antoine (Codir.)

Thèse de doctorat : Université de Fribourg, 2001 ; no 1362.

Two different projects related to Atomic Physics are contained in the present Ph.D. thesis. The first project concerns the natural widths of atomic core levels whereas the second one deals with the double KL excitation of gaseous argon resulting from impact with monoenergetic photons. The first project itself is divided in two parts: the first one is an experimental study of the L1 to N5 atomic...

Université de Fribourg

Inner-shell shake processes in light elements and 3s atomic-level widths of lanthanides

Mauron, Olivier ; Dousse, Jean-Claude (Dir.) ; Schaller, Lukas (Codir.)

Thèse de doctorat : Université de Fribourg, 2003 ; no 1399.

Three different parts related to experimental Atomic Physics are contained in the present Ph. D. thesis. In the three projects the measurements were performed by means of high-resolution x-ray spectroscopy, using a reflecting von Hamos-type bent crystal spectrometer. This experimental technique represents thus the common denominator of the three projects. The two first parts of the thesis are...