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Scientific Highlights

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Datum
11 November 2021
Experimental setup

Discovery of new chemistry on aerosol surfaces

In a study published in Science, ambient-pressure X-ray photoelectron spectroscopy reveals spontaneous redox chemistry at solvating particle surfaces.

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9 November 2021
particle-detection

What you see is what you get: Automated particle detection without the false positives

A new algorithm by PSI researchers enables fast and reliable detection of spherical objects in images with a complex background.

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5 November 2021
Ammonium sulfate has been used as a probe for aerosol particles and investigated in situ by means of ambient pressure X-ray photoelectron spectroscopy. Unexpectedly, when the particles start to absorb water, a spontaneous redox reaction leading to nitrogen and elemental sulfur takes place.

PUBLISHED IN SCIENCE: A surface-promoted redox reaction occurs spontaneously on solvating inorganic aerosol surfaces

Ammonium sulfate has been used as a probe for aerosol particles and investigated in situ by means of ambient pressure X-ray photoelectron spectroscopy. Unexpectedly, when the particles start to absorb water, a spontaneous redox reaction leading to nitrogen and elemental sulfur takes place.

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4 November 2021
Retina

Neurodegenerative disease studied by cryogenic X-ray nanotomography

Hard X-ray cryo-tomography scanning of retina from healthy and inherited blindness specimen paves the way for correlative analysis after imaging at the cSAXS beamline.

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4 November 2021
Lithium Fluoride on Ag(100): Dendrites vs. Islands

Vastly Different Morphologies Dependent on the Growth Temperature

Lithium fluoride is an important material which is technologically exploited in spintronics and organic light emitting devices. It turns out that there is a vast difference between the morphologies of ultrathin lithium fluoride grown on the (100) facet of a silver single crystal.  At room temperature dendrites are obtained while at elevated temperature lithium fluoride forms square islands. The system is an interesting model to study the crossover between diffusion limited aggregates and island growth.

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2 November 2021
diamond_grantings_teaser

Diamond gratings for XFEL amplitude-splitting delay line

A split-and-delay line for XFEL pulses has been built and successfully tested by a team of researchers at the Linac Coherent Light Source. Key X-ray optical elements are two diamond diffraction gratings made at the Paul Scherrer Institut that are used to split and later recombine the intense ultrashort X-ray laser pulses for time-resolved measurements.

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1 November 2021
Meseguer et al

Coexistence of structural and magnetic phases in van der Waals magnet CrI3

CrI3 has raised as an important system to the emergent field of two-dimensional van der Waals magnetic materials. However, it is still unclear why CrI3 which has a ferromagnetic rhombohedral structure in bulk, changed to anti-ferromagnetic monoclinic at thin layers. Here we show that this behaviour is due to the coexistence of both monoclinic and rhombohedral crystal phases followed by three magnetic transitions at TC1 = 61 K, TC2 = 50 K and TC3 = 25 K.

 

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29 October 2021
Take a deep breath

Take a deep breath. But how clean was the air?

The EU project, RI-URBANS, aims to improve air quality monitoring across Europe

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28 October 2021
dual-photocathode laser capabilities and perspectives for exotic FEL modes

Overview of SwissFEL dual-photocathode laser capabilities and perspectives for exotic FEL modes

SwissFEL is a compact, high-brilliance, soft and hard X-ray Free Electron Laser (FEL) facility laser composed of two parallel beam lines seeded by a common linear accelerator (LINAC), and a two-bunch photo-injector. For the injector, an innovative dual-photocathode laser scheme has been developed based on state-of-the-art Ytterbium femtosecond laser systems. We just published an overview of the the SwissFEL Photo Cathode Drive Lasers (PCDL) performance, pulse shaping capabilities as well as the versatility of the systems, which allow many different modes of operation of SwissFEL [1]. The full control over the SwissFEL electron bunch properties via the unique architecture of the PCDL will enable in the future the advent of more advanced FEL modes; these modes are, but not restricted to, the generation of single or trains of sub-fs FEL pulses, multi-color FEL and finally the generation of fully coherent X-ray pulses via laser-based seeding.

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28 October 2021
Spatially resolved likelihood for glycation of collagen

Glycation of collagen: Quantifying rates

Collagen is abundant in the connective tissue of human beings, e.g. in tendons, ligament and cornea. Glycation of collagen distorts its structure, renders the extracellular matrix stiff and brittle and at the same time lowers the degradation susceptibility thereby preventing renewal. Based on models and with parameters determined from experimental data, we describe the glycation of type 1 collagen in bovine pericardium derived bio-tissues upon incubation in glucose and ribose. We hope that this contributes to a better quantitative understanding of the effects of diabetes on collagen.

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PSI Scientific Reports

Archive 2006-2012. The Scientific Reports – containing accounts of research topics from all the different areas – provide an impression of the variety of subjects researched at PSI.

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