A l’Institut Paul Scherrer, les scientifiques cherchent des réponses à la question essentielle des structures élémentaires de la matière et des principes fondamentaux de fonctionnement dans la nature. Ils étudient la structure et les propriétés des particules élémentaires – les plus petits composants de la matière – ou se penchent sur la question de savoir comment les molécules biologiques sont structurées et remplissent leur fonction. Les connaissances qu’ils acquièrent de la sorte ouvrent de nouvelles pistes de solution en sciences, en médecine ou dans le domaine des technologies.
Pour en savoir plus, reportez-vous à Aperçu Fondements de la nature
Surface oxidation/spin state determines oxygen evolution reaction activity of cobalt-based catalysts in acidic environment
Co-based catalysts are promising candidates to replace Ir/Ru-based oxides for oxygen evolution reaction (OER) catalysis in an acidic environment. However, both the reaction mechanism and the active species under acidic conditions remain unclear. In this study, by combining surface-sensitive soft X-ray absorption spectroscopy characterization with electrochemical analysis, we discover that the acidic OER activity of Co-based catalysts are determined by their surface oxidation/spin state.
Eure Fragen zu Karriereberatung
‘Hast du Beispiele der wichtigsten Fragen und Antworten aus den Karriereberatungen? Worüber redest du mit den Nachwuchsforschenden? Was passiert, wenn ich nicht so recht weiss, welche Karriereunterstützung ich brauche? Was erwartet mich in einer Karriereberatung? Und worüber sprechen wir denn eine ganze Stunde?’
Hast du dich das auch schon gefragt, und bis jetzt keine gute Möglichkeit gefunden, diese Frage zu stellen? – Da andere die gleichen Fragen hatten, findest du es jetzt in diesem Blog Post heraus:
Sauver la musique grâce aux rayons X
La SLS joue B.B. King, le King of the Blues! En collaboration avec le Montreux Digital Project, des bandes sonores historiques sont numérisées au PSI.
Un raccourci possible
L’apprentissage machine et l’intelligence artificielle font désormais partie des outils de la plupart des scientifiques du PSI. Ces méthodes modifient parfois en profondeur la science.
Lubna Dada
Sur la piste des bioaérosols végétaux pour améliorer les modèles climatiques
Progrès grâce à la collaboration stratégique
Le Paul Scherrer Institut (PSI) et l'entreprise finlandaise PiBond collaborent pour exploiter commercialement des produits semi-conducteurs avancés fabriqués avec la lithographie EUV.
Wareneingang im Zentrallager
Zurzeit bewirtschaften wir ca. 14'000 normierte Artikel. Wir vom Materialdienst haben den Überblick!
Hinter den Kulissen: Eine Aufgabe der Gebäudereiniger am PSI
Ein Teil meiner Arbeit ist das Extrahieren, was ist das?
Farewell of Agnes Åhl
From October 2023 to March 2024, Agnes Åhl, a SwedNess PhD student in the group of Lennart Bergström at the Stockholm University, absolved her external stay in the Soft Matter Group at LNS.
XL-Ausbildungssitzung
Eine Sitzung zum Austauschen, besprechen und reflektieren, gemeinsam mit den Lernenden und Berufsbildnerinnen.
All Two-Loop Feynman Integrals for Five-Point One-Mass Scattering
We compute the complete set of two-loop master integrals for the scattering of four massless particles and a massive one. Our results are ready for phenomenological applications, removing a major obstacle to the computation of complete next-to-next-to-leading order QCD corrections to processes such as the production of a H/Z/W boson in association with two jets at the LHC. Furthermore ...
Laura Heyderman
Comment construire un microrobot qui peut être contrôlé magnétiquement?
Collaboartion Meeting in Wengen
The Mu3e collaboration met four four days in Wengen. We discussed in detail the steps needed to build and integrate the detector and how to calibrate and control it. Further sessions were dedicated to on- and offline analysis of first data.
Polybenzimidazole Membrane Design Principles for Vanadium Redox Flow Batteries
Energy storage technologies with long storage duration are essential to stabilize electricity grids with a high share of intermittent renewable power. In a redox flow battery, the electrochemical conversion unit, where the charging and discharging reaction takes place, is spatially separated from the energy storage medium. In the all-vanadium redox flow battery (VRFB), a sulfuric acid aqueous electrolyte with dissolved vanadium ions is used as the storage medium. Vanadium is present in 4 different oxidation states, the redox couple vanadium(II) and (III) on the negative side of the cell, and vanadium(IV) and (V) on the positive side. This allows the battery to be repeatedly charged and discharged. A separator or membrane is used between the negative and positive electrode, which should selectively conduct the ions of the supporting electrolyte and minimize the passage of vanadium ions. Fluorinated membranes, such as Nafion™, are often used for this key component, but these ionomers were not originally developed for this application and therefore have functional shortcomings. Furthermore, the production and use of fluorinated materials is to be severely restricted or even banned in Europe. Therefore, the development of hydrocarbon-based membranes for the VRFB is of great importance. The study reported here focuses on polybenzimidazole polymers and membranes, which could be a promising materials class for next generation flow batteries.
Ein faszinierender Tag mit den ETH-Lernenden am PSI
ETH-Lernende erkunden das PSI: Spannende Vorträge, beeindruckende Führungen und Einblicke in den Lehrberuf KV. Ein Tag voller Entdeckungen und Austausch.
Nouveau procédé de fabrication de semi-conducteurs
L’Institut Paul Scherrer PSI travaille avec l’entreprise finlandaise PiBond à l’utilisation commerciale de produits semi-conducteurs avancés fabriqués par lithographie EUV.
Die Suche nach dem richtigen Beruf: Die Berufsschau in Etzgen bietet Orientierung
An der Berufsschau in Etzgen mit über 1000 Besucherinnen und Besucher wurden Weichen gestellt, das PSI war auch vor Ort!
High-resolution ptychographic imaging at a seeded free-electron laser source using OAM beams
Electromagnetic waves possessing orbital angular momentum (OAM) are powerful tools for applications in optical communications, quantum technologies, and optical tweezers. Now, a consortium of collaborators in France, Italy, Slovenia, Spain, Switzerland, Sweden, and the US reports on using such beams in the extreme ultraviolet region for ptychographic imaging in the cover page article of Optica 11, Issue 3. By controlling the topological charge, the researchers achieve an improvement of 30% in image resolution.
Ben Gayther successfully defends his thesis
Ben Gayther developed calibration algorithms, carried out detailed studies on the use of timing information in reconstruction, and contributed to the integration run at PSI. He has now successfully defended his thesis at University College London.
What will the SLS 2.0 upgrade mean for experiments?
Tighter beams, brighter light and extended photon energies open new experimental possibilities.
Collaboration Meeting in Wengen
The Mu3e collaboration met four four days in Wengen. We discussed in detail the steps needed to build and integrate the detector and how to calibrate and control it. Further sessions were dedicated to on- and offline analysis of first data.
Hydrogène: suffisamment propre pour le tournant énergétique?
L’hydrogène peut jouer un rôle déterminant dans la transition vers un système énergétique zéro net. Mais pour ce faire, il doit être produit correctement.
Electron Glass Phase with Resilient Zhang-Rice Singlets in LiCu3O3
LiCu3O3 is an antiferromagnetic mixed valence cuprate where trilayers of edge-sharing Cu(II)O (3d9) are sandwiched in between planes of Cu(I) (3d10) ions, with Li stochastically substituting Cu(II). Angle-resolved photoemission spectroscopy (ARPES) and density functional theory reveal two insulating electronic subsystems that are segregated in spite of sharing common oxygen atoms: a Cu dz2/O pz derived valence band (VB) dispersing on the Cu(I) plane, and a Cu 3dx2−y2/O 2px,y derived Zhang-Rice singlet (ZRS) band dispersing on the Cu(II)O planes.
Elternabend 2024
Elternabend – Schnee von gestern?
New report: “Future demand for flexibility and the significance of baseload energy in Switzerland”
In a new report, “Future demand for flexibility and the significance of baseload energy in Switzerland,” PSI-LEA researchers examine the role of baseload energy in Switzerland's energy system and discuss the challenges of transitioning to a mostly CO2-free system.
Est-il possible de voler sans impact sur le climat?
Le trafic aérien doit devenir climatiquement neutre. Quelle pourrait être la contribution des carburants durables, comme ceux que l’on développe au PSI?
Permettre l’utilisation quotidienne de batteries lithium-air performantes
Les faisceaux de neutrons et la lumière synchrotron révèlent les processus chimiques qui se jouent dans les batteries lithium-air.
Developing detectors to transform science with light (part 2)
Part II: Why detecting soft X-rays is hard, and how a new breakthrough is set to transform low energy X-ray science.
Flat-band hybridization between f and d states near the Fermi energy of SmCoIn5
We present high-quality angle-resolved photoemission (ARPES) and density functional theory calculations (DFT+U) of SmCoIn5. We find broad agreement with previously published studies of LaCoIn5 and CeCoIn5, confirming that the Sm 4f electrons are mostly localized. Nevertheless, our model is consistent with an additional delocalized Sm component, stemming from hybridization between the 4f electrons and the metallic bands at “hot spot” positions in the Brillouin zone.
Efficient transient X-ray absorption spectroscopy
By combining the unique large bandwidth emission mode of SwissFEL’s ARAMIS undulator and diffractive X-ray optics made of diamond, we have demonstrated a new method for time-resolved X-ray absorption near edge structure (XANES) spectroscopy that enables faster data acquisition and requires smaller sample quantities for high-quality data.