International group of physicists including specialists from Landau Institute for Theoretical Physics improved their model describing damage processes in ruthenium thin films induced by powerful femtosecond laser. Such films are used as coatings for the mirrors of the European X-Ray Free-Electron Laser Facility (XFEL). This is a unique device that helps scientists to map atomic details of viruses, make snapshots of chemical reactions and even make “videos” of them. Understanding what happens when powerful laser pulse interacts with thin films, scientists can create more long-lasting covers for XFEL mirrors. Article is published in Applied Surface Science journal.