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Université de Fribourg

Resonance raman optical activity shows unusual structural sensitivity for systems in resonance with multiple excited states: vitamin B12 case

Machalska, Ewa ; Zajac, Grzegorz ; Gruca, Anna ; Zobi, Fabio ; Baranska, Malgorzata ; Kaczor, Agnieszka

In: The Journal of Physical Chemistry Letters, 2020, vol. 11, no. 13, p. 5037–5043

In this work, cobalamins with different upper axial substituents and a cobalamin derivative with a ring modification were studied using chiroptical spectroscopies, in particular resonance Raman optical activity (RROA), to shed light on the influence of structural modifications on RROA spectra in these strongly chiral systems in resonance with multiple excited states at 532 nm excitation. We...

Université de Fribourg

Quantum simulation meets nonequilibrium dynamical mean-field theory: exploring the periodically driven, strongly correlated fermi-hubbard model

Sandholzer, Kilian ; Murakami, Yuta ; Görg, Frederik ; Minguzzi, Joaquín ; Messer, Michael ; Desbuquois, Rémi ; Eckstein, Martin ; Werner, Philipp ; Esslinger, Tilman

In: Physical Review Letters, 2019, vol. 123, no. 19, p. 193602

We perform an ab initio comparison between nonequilibrium dynamical mean-field theory and optical lattice experiments by studying the time evolution of double occupations in the periodically driven Fermi-Hubbard model. For off-resonant driving, the range of validity of a description in terms of an effective static Hamiltonian is determined and its breakdown due to energy absorption close to...

Consortium of Swiss Academic Libraries

Explaining the heat capacity of wood constituents by molecular vibrations

Thybring, Emil

In: Journal of Materials Science, 2014, vol. 49, no. 3, p. 1317-1327

Université de Fribourg

Power enhancement via an ion-channel in a Raman free-electron laser

Huang, Xiaoli ; Zhang, Shi-Chang

In: Laser Physics, 2018, vol. 28, no. 9, p. 095002

As a high-power and high-efficiency coherent radiation source, the free-electron laser extends to two unique spectra: the region in the ultra-violet, x- and -rays, and the range in the millimeter- and terahertz-waves. Based on credible simulations, it is shown that the nonlinear power of a Raman free-electron laser in a millimeter wave range goes up and gets an increase of at least 9% when an...

Consortium of Swiss Academic Libraries

Characterizing vibrational motion beyond internal coordinates

Hug, Werner ; Fedorovsky, Maxim

In: Theoretical Chemistry Accounts, 2008, vol. 119, no. 1-3, p. 113-131