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Laboratory for Synchrotron Radiation and Femtochemistry

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Laboratory for Synchrotron Radiation and Femtochemistry (LSF)

Mission

We develop and apply x-ray-based tools to solve scientific and technological questions in chemical research and related fields. Our world-leading instruments allow us to extract electronic and structural information from complex systems and to follow chemical processes from the initial electronic excitation to reaction mechanisms under operando conditions. We collaborate with Swiss and international scientists to advance academic and industrial research.

Scientific Highlights

29 janvier 2021
Artistic_depiction_of_the_experiment

Clocking the movement of electrons inside an atom

Scientists pioneer an approach called self-referenced streaking, clocking Auger electrons with sub-femtosecond resolution. The breakthrough will unlock the broader potential for attosecond time resolution at X-ray free-electron lasers.

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15 décembre 2020
Dario Ferreira Sanchez

Vue en trois dimensions de l’intérieur de catalyseurs actifs

Recherche avec la lumière synchrotron Recherche sur les matériaux Matière et matériaux

La spectroscopie de rayons X in operando permet de jeter un coup d’œil à l’intérieur de réacteurs chimiques en fonction. Des chercheurs de l’Institut de technologie de Karlsruhe (KIT), à l’Institut Paul Scherrer PSI et à l’European Synchrotron Radiation Facility (ESRF) en France, appliquent avec succès cette méthode.

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2 décembre 2020
goerlin_2020.png

Key activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations

Ni-Fe oxyhydroxide is among the most active oxygen evolution electrocatalysts. Electrolyte alkali metal cations modify the activity and reaction intermediates, however, the exact mechanism is at question due to unexplained deviations from the cation size trend. Our X-ray absorption spectroelectrochemical results show that the OER activity follows the variations in .electrolyte pH rather than a specific cation. Our DFT-based reactivity descriptors confirm the conclusions of an indirect pH effect.

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24 novembre 2020
hemberger_ruzicka

Ruzicka Prize

The Ružička ​Prize 2020 goes to Dr. Patrick Hemberger (PSI) for his research on understanding the mechanisms of catalytic fast pyrolysis by unveiling reactive intermediates in heterogeneous catalysts.

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29 septembre 2020
spin_cascade_and_doming_in_ferric_hemes.jpg

Spin cascade and doming in ferric hemes

In biology, structure and function are closely interwoven. A case in point is oxygen transport in the lungs, which relies on ferrous heme proteins adopting dome-like shapes.

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25 septembre 2020
First light at Maloja endstation

First light in the SwissFEL Maloja endstation

The first endstation at the SwissFEL Athos soft X-ray branch is rapidly developing and on track for first experiments in 2021.

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14 septembre 2020
Cyt C structure

Unraveling the structural dynamics of Heme proteins at SwissFEL

The results from the very first user experiment at SwissFEL have just been published in the Proceedings of the National Academy of Sciences (PNAS). The measurements probed the electron transport properties of the cytochrome c protein, which is found in cellular mitochondria. The measurements show that when the Fe atom at the centre of the protein undergoes electronic excitation, for example when it gains or loses and electron, the  active centre of the protein undergoes a doming structural rearrangement. This result raises interesting questions about how this structural change is involved in the electron transfer properties of cytochrome c.

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31 août 2020
Smolentsev_2020

The structure of active sites of CoMo/Al2O3 catalysts determined by RIXS spectroscopy.

A fundamental understanding of the active sites in technical CoMo/ Al2O3 catalysts is crucial to improve the production of clean transportation fuels by hydrodesulfurization (HDS), which removes sulfur from fossil fuels. Sulfur dioxide, resulting from fossil fuel combustion, is one of the main causes for acid rain. In situ X-ray spectroscopic experiments at the SuperXAS beamline of the SLS provided insight in the structure and number of active sites (“Co−Mo−S”) in sulfided CoMo/ Al2O3 catalysts. When the Co to Mo ratio is less than 0.1, cobalt forms isolated sites on the MoS2 phase, where the cobalt promoter atoms are in centrosymmetric octahedral coordination with six-sulfur ligands.

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1 août 2020
cover_chem_sci_VUV

Methylbismuth: First observation of an organometallic biradical reactive intermediate

Open shell organometallic bismuth are promising agents for catalytic applications, but difficult to characterize due to their high reactivity. The simplest methylbismuth (Bi-CH3), a biradical species, was in-situ synthesized and spectroscopically characterized for the first time. Electronic and thermochemical properties could be obtained, which will guide future synthetic applications.

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Contact

Laboratory for Synchrotron Radiation and Femtochemistry (LSF)
Paul Scherrer Institut
5232 Villigen-PSI
Switzerland

Head of Laboratory
Prof. Dr. Christoph Bostedt
Tel: +41 56 310 35 94
christoph.bostedt@psi.ch

Administration
Ms Charlotte Heer
Tel: +41 56 310 3178
charlotte.heer@psi.ch

Photon Science Division

Homepage of PSI Division Photon Science (PSD)

Swiss Light Source SLS

Synchrotron light large research facility.


SwissFEL

The new X-ray free electron laser facility.
 


LSF Highlights

LSF-specific scientific highlights and news

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