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Université de Fribourg

Electronic structure and photoluminescence properties of Eu(η9-C9H9)2

Ramanantoanina, Harry ; Merzoud, Lynda ; Muya, Jules Tshishimbi ; Chermette, Henry ; Daul, Claude

In: The Journal of Physical Chemistry A, 2020, vol. 124, no. 1, p. 152–164

The electronic structure of Eu2+ compounds results from a complex combination of strongly correlated electrons and relativistic effects as well as weak ligand–field interaction. There is tremendous interest in calculating the electronic structure as nowadays the Eu2+ ion is becoming more and more crucial, for instance, in lighting technologies. Recently, interest in semiempirical methods to...

Université de Fribourg

Coupling of electronic and nuclear motion in a negative ion resonance: Experimental and theoretical study of benzene

Allan, Michael ; Čurík, Roman ; Čársky, Petr

In: The Journal of Chemical Physics, 2019, vol. 151, no. 6, p. 064119

We present calculated and measured elastic and vibrational excitation cross sections in benzene with the objective to assess the reliability of the theoretical method and to shed more light on how the electronic motion of the incoming electron is coupled with the nuclear motion of the vibrations. The calculation employed the discrete momentum representation method which involves solving the...

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...

Consortium of Swiss Academic Libraries

More Than Charged Base Loss — Revisiting the Fragmentation of Highly Charged Oligonucleotides

Nyakas, Adrien ; Eberle, Rahel ; Stucki, Silvan ; Schürch, Stefan

In: Journal of The American Society for Mass Spectrometry, 2014, vol. 25, no. 7, p. 1155-1166

Université de Fribourg

Excitonic channels from bio-inspired templated supramolecular assembly of J-aggregate nanowires

Anantharaman, Surendra B. ; Messmer, Daniel ; Sadeghpour, Amin ; Salentinig, Stefan ; Nüescha, Frank ; Heier, Jakob

In: Nanoscale, 2019, vol. 11, no. 14, p. 6929–6938

Supramolecular assemblies with controlled morphology are of paramount importance for energy transport in organic semiconductors. Despite considerable freedom in molecular design, the preparation of dyes that form one dimensional J-aggregates is challenging. Here, we demonstrate a simple and effective route to functionalize dendronized polymers (DPs) with J-aggregates to construct tubular...

Université de Neuchâtel

Action selectors without Floer-Homology

Haug, Carsten ; Schlenk, Felix (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Hamiltonian systems on symplectic manifolds tend to have many periodic orbits. The “actions” of these orbits form an invariant for the Hamiltonian system. The set of actions can be very large, however. To get useful invariants, one selects for each Hamiltonian function just one action value by some minimax procedure: A so-called action selector associates with every compactly supported...