Ergebnisse einschränken

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...

Least-Squares Fitting of Time-Domain Signals for Fourier Transform Mass Spectrometry

Aushev, Tagir ; Kozhinov, Anton ; Tsybin, Yury

In: Journal of The American Society for Mass Spectrometry, 2014, vol. 25, no. 7, p. 1263-1273

A non-empirical calculation of 2p core-electron excitation in compounds with 3d transition metal ions using ligand-field and density functional theory (LFDFT)

Ramanantoanina, Harry ; Daul, Claude

In: Physical Chemistry Chemical Physics, 2017, vol. 19, no. 31, p. 20919–20929

Methodological advents for the calculation of the multiplet energy levels arising from multiple-open-shell 2p53dn+1 electron configurations, with n = 0, 1, 2,… and 9, are presented. We use the Ligand-Field Density Functional Theory (LFDFT) program, which has been recently implemented in the Amsterdam Density Functional (ADF) program package. The methodology consists of calculating the...

Electronic fine structure calculation of metal complexes with three-open-shell s, d, and p configurations

Ramanantoanina, Harry ; Daul, Claude

In: Journal of Molecular Modeling, 2017, vol. 23, no. 8, p. 243

The ligand field density functional theory (LFDFT) algorithm is extended to treat the electronic structure and properties of systems with three-open-shell electron configurations, exemplified in this work by the calculation of the core and semi-core 1s, 2s, and 3s one-electron excitations in compounds containing transition metal ions. The work presents a model to non-empirically resolve the...

High energy resolution off-resonant X-ray spectroscopy

Błachucki, Wojciech ; Hoszowska, Joanna (Dir.)

Thèse de doctorat : Université de Fribourg, 2015 ; no. 1932.

Effets de la circulation d'air par effet de cheminée dans l'évolution du régime thermique des éboulis froids de basse et moyenne altitude

Morard, Sébastien ; Delaloye, Reynald (Dir.)

Thèse de doctorat : Université de Fribourg, 2011 ; no 1732.

Dans les Alpes suisses, le pergélisol – portion du sous-sol dont la température reste inférieure à 0°C durant au moins une année – est présent de manière discontinue au-dessus de 2'300 m d’altitude environ. Néanmoins des conditions de sol anormalement et durablement froides – indicatrices de l’existence possible de pergélisol sporadique – se rencontrent aujourd’hui en de...

External background radiation in the Fribourg (Switzerland) urban area

Boucher, Mathieu ; Völkle, Hansruedi (Dir.) ; Jenny, Titus (Codir.)

Thèse de doctorat : Université de Fribourg, 2008 ; no 1599.

We are constantly exposed to ionizing radiation of different type. Most of the radiation exposure comes from natural sources. External background ° radiation originates from two different sources, terrestrial and cosmic. Terrestrial radiation originates from two different background, natural and artificial or “man-made” isotopes. The artificial radiation contributes very little to the total...

Développement d'une méthode de détermination du monométhyle mercure dans des échantillons de sol et de sédiments par spectrométrie d'absorption atomique de vapeur froide avec amalgameur en or = Determination of the monomethylmercury in soil and sediments sample by cold vapor atomic absorption spectrometry with gold amalgamator

Ramanantoanina, Harry ; Cicciarelli, Romolo (Dir.)

Mémoire de diplôme HES : Haute Ecole d'Ingénierie, 2008.

Entwicklung einer DGT-Methode zur Erfassung von anionischen Metallkomplexen in Gewässern = Développement d’une méthode DGT pour la détermination

Hagen, Sarah ; Cicciarelli, Romolo (Dir.)

Mémoire de diplôme HES : Haute Ecole d'Ingénierie, 2007.

Ziel Ziel der Arbeit war, eine DGT-Methode zur Erfassung von anionischen Metallkomplexen in Gewässern zu entwickeln. Die DGT-Methode (diffusive gradients in thin-films) erlaubt eine in situ Probennahme. Hierbei werden Schwermetallionen selektiv auf einem Ionenaustauscher-Harz akkumuliert. In erster Linie galt es einen geeigneten Anionentauscher für die Bestimmung der Schwermetalle Antimon,...

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...