Frontpage of the Paul Scherrer Institut (PSI)

PSI Aerial View
The Paul Scherrer Institute, PSI, is the largest research institute for natural and engineering sciences within Switzerland. We perform world-class research in three main subject areas: Matter and Material; Energy and the Environment; and Human Health. By conducting fundamental and applied research, we work on long-term solutions for major challenges facing society, industry and science.

19 March 2020
So zeigte sich «Athos» am 17. Dezember 2019 auf dem Bildschirm im Kontrollraum: als kompakter Röntgenlaserstrahl.

Athos is making great strides

SwissFEL Matter and Material Large Research Facilities

The new beamline at PSI's X-ray free-electron laser SwissFEL will soon be ready for action. In December, Athos delivered laser light for the first time − even sooner than expected, to the delight of the researchers responsible for its construction.

Read more
13 March 2020
Teaser: Erstmals chemische Reaktionen direkt im Feinstaub nachgewiesen

First-time direct proof of chemical reactions in particulates

Media Releases Enviroment Energy and Environment

Researchers at the Paul Scherrer Institute PSI have developed a new method to analyse particulate matter more precisely than ever before. With its help, they disproved an established doctrine: that molecules in aerosols undergo no further chemical transformations because they are enclosed in other particulate matter.

Read more