Transition énergétique

Abandon de l’énergie nucléaire, développement de l’énergie solaire et éolienne, production d’énergie à partir de la biomasse, réduction de la consommation d’énergie. D’ici 2050, la Suisse doit atteindre la neutralité climatique. Un objectif ambitieux, rendu plus urgent que jamais par une situation géopolitique de plus en plus difficile. Comment faire pour mettre en place ces prochaines années un approvisionnement énergétique durable et résistant pour la Suisse? Comment les énergies renouvelables peuvent-elles être utilisées de manière optimale? Quelles sont les nouvelles technologies les plus prometteuses? Au PSI, des chercheurs s’efforcent de trouver des réponses à ces questions décisives.

Zoom Collaboration Meeting

Virtual Collaboration Meeting

During the Corona crisis, meetings are only possible online. The Mu3 collaboration met today virtually with more than 20 people from three different countries.

Han purple

Understanding Quantum Critical Magnetism in Han Purple

The ancient purple pigment used to paint the terracotta warriors, BaCuSi2O6, is also a quantum magnetic material which consists of stacked Cu2+ bilayers hosting spin dimers. Magnetometry and NMR experiments have revealed puzzling critical phenomena at the quantum phase transition (QPT) caused by an applied magnetic field, which suggest that the universal behaviour of the system is not three- but only two-dimensional. By performing high-resolution neutron spectroscopy measurements .....

 

Abisoliergerät

Den «Funken im Griff»

Eine andere Variante Mantel-Thermoelemente abisolieren zu können.

Unterstützung während Corona

Auf dieser Seite finden sich hilfreiche Tools und Links für Familien und andere Personen, die Betreuungsarbeit und Home-Office während Corona verbinden.

Atomic structure of 2D materials

2D Materials

Hexagonal boron nitride (h-BN) “nanomesh”, a two-dimensional insulating monolayer, grown on the (111) surface of rhodium exhibits an intriguing hexagonal corrugation pattern with a lattice constant of 3.2 nm.

CMS 2020

Measurement of properties of Bs0 → μ+μ− decays and search for B0 → μ+μ− with the CMS experiment

Results are reported for the B0s → μ+μ branching fraction and effective lifetime and from a search for the decay B0 → μ+μ−. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7TeV (5fb−1), 8TeV (20fb−1),and 13TeV (36fb−1).

Teaser neutron stroboscopy

Batteries under the neutron stroboscope

The first application of stroboscopic neutron diffraction to studying lithium-ion batteries during operation establishes a new approach to unravelling the complex processes playing out in energy-storage materials.

 

Teaser neutron stroboscopy

Batteries under the neutron stroboscope

The first application of stroboscopic neutron diffraction to studying lithium-ion batteries during operation establishes a new approach to unravelling the complex processes playing out in energy-storage materials.

Spin wave channels in an artificial spin ice/underlayer hybrid system

Tailoring Spin-Wave Channels in an Artificial Spin Ice

Magnonic crystals are periodic magnetic structures, which are attracting great interest because of their potential use in low-power information technology based on spin waves, or magnons. Artificial spin ices have been recently studied as reconfigurable magnonic crystals, but achieving the required combination of magnetic state reconfigurability and desired magnon dispersions remains challenging. Here, researchers propose a hybrid system that makes use of a magnetic thin film underlayer to couple and strengthen the interaction between the artificial spin ice’s nanoelements though spin waves. Moreover, the magnetic state of the artificial spin ice gives rise to directional spin wave channels in the underlayer. This hybrid system opens a new direction for band structure engineering in reconfigurable magnonic crystals.

Role of water in the oxidation of methane on Palladium foil

Role of water on the structure of palladium for methane complete oxidation

The mechanism of methane oxidation in the presence of water has been investigated in situ by means of APXPS. 

Kinetics of iridium thermal oxidation followed while dosing 1 mbar oxygen

Kinetics of the Thermal Oxidation of Ir(100) Studied by APXPS

The thermal oxidation of single-crystalline Ir(100) films toward rutile IrO2(110) has been investigated in situ by means of APXPS. 

Brennstoffzellenexponat 01

Brennstoffzellenexponat im PSI forum

Anfang dieses Jahres haben die Physiklaboranten des 3. Lehrjahres das Brennstoffzellen Exponat im PSI forum repariert und auf den neusten Stand gebracht. 

Lawley et al

Examining the surface evolution of LaTiOxNy an oxynitride solar water splitting photocatalyst

LaTiOxNy oxynitride thin films are employed to study the surface modifications at the solid- liquid interface that occur during photoelectrocatalytic water splitting. Neutron reflectometry and grazing incidence x-ray absorption spectroscopy were utilised to distinguish between the surface and bulk signals, with a surface sensitivity of 3 nm.

SASTT setup for imaging the myelin of a mouse brain

Microcalcifications in breast tissue: Paving the way for future diagnostic solutions?

Microcalcifications are a common sign in mammography. For example, in 90% of ductal carcinoma in situ microcalcifications are the first and unique sign indicating the presence of the lesion. Nevertheless, up to around 50% of the resulting biopsies reveal a benign lesion, a 'false positive'. Researchers were able to show now that breast microcalcifications detected in tumors have specific chemical and crystalline features different from those observed in benign samples. Moreover, microcalcifications detected in tumors but located outside the lesion show malignant features too. This indicates that cancer influences the surrounding tissue even if it exhibits apparently healthy morphological features. These results indicate that the biochemical differences between benign and malignant microcalcifications can be potentially identified by light-based tools, able to investigate microcalcifications inside the breast without performing biopsies.

Information for CHRISP users

Because of the present coronavirus situation, preparations for the startup of the proton accelerator HIPA are currently suspended since March 16. At that point in time, there were still about 8 weeks to finalize the shutdown work.

Kartoffeln

Home Office der Lernenden Chemielaboranten während Coronavirus

Mit den folgenden Beiträgen wollen wir Ihnen zeigen, welche Projekte die Chemielaboranten während dem Home Office erarbeitet haben. Zudem wollen wir Ihnen auch veranschaulichen, dass Chemie überall in unserem Alltag anzutreffen ist.

Tensor tomography images of a crocodile tooth.

Rapid 3D directional small-angle scattering imaging achieved at TOMCAT

Researchers from the TOMCAT beamline have developed a small-angle scattering tensor tomography method to visualize microscopic features within a macroscopic field of view with unprecedented data acquisition speed. The results of the study were published in Applied Physics Letters on April 1, 2020.

Tensor tomography images of a crocodile tooth.

Rapid 3D directional small-angle scattering imaging achieved at TOMCAT

Researchers from the TOMCAT beamline have developed a small-angle scattering tensor tomography method to visualize microscopic features within a macroscopic field of view with unprecedented data acquisition speed. The results of the study were published in Applied Physics Letters on April 1, 2020.

covid-19

SLS MX beamtime update

Update of the SLS MX beamline operation during the COVID-19 period

safonova_2020_acscat2.jpeg

Elucidating the Oxygen Activation Mechanism on Ceria-Supported Copper-Oxo Species Using Time-Resolved X-ray Absorption Spectroscopy

We monitored the dynamic structure of the active sites in a catalyst containing highly dispersed copper-oxo species on ceria during low-temperature CO oxidation using time-resolved X-ray absorption spectroscopy. We quantitatively demonstrate that the CO oxidation mechanism below 90 °C involves an oxygen intermediate strongly bound to the active sites as well as the redox activity of Cu2+/Cu+ and Ce4+/Ce3+ couples.

SNF funds dynamic X-ray imaging of the human auditory system in motion

In collaboration with clinicians from the Inselspital and engineers of the University Hospital of Bern, the X-Ray Tomography Group will be part of a new SNF project entitled “The Human Auditory System in Motion: Direct Observation of the Microfunction of Sound Transmission using Dynamic Phase-contrast X-ray Imaging”.