The SMART-X project has been a collaborative initiative focused on enhancing ultrafast X-ray spectroscopy techniques and their applications in materials science, encompassing advancements in methodology, technology, and significant scientific findings across various materials, including perovskites, Dirac semimetals, and organic polymers.
The project has led to notable developments in laser technology for XUV and X-ray ultrafast spectroscopy, particularly through advancements in High Harmonic Generation (HHG). At the Institut de Ciències Fotòniques (ICFO), researchers generated soft X-rays using high-energy pulses, facilitating time-resolved experiments that improved understanding of ultrafast electron dynamics. Similarly, a transient X-ray absorption apparatus developed at Forschungsverbund Berlin e.V. (FVB-MBI) using a Ti:Sapphire laser system, enabled the investigation of various ultrafast dynamics with a broad soft X-ray spectrum.
Efforts to use mid-infrared pumps and soft X-ray probes at the Consiglio Nazionale delle Ricerche (CNR) aimed to study materials like Weyl semimetals and perovskites, achieving high harmonics that enabled detailed transient spectroscopy. At FASTLITE, substantial improvements were made in table-top coherent soft X-ray sources, increasing their competitiveness with larger facilities, and achieving stable carrier-envelope-phase pulses essential for extended experiments. Meanwhile, GREATEYES contributed by creating advanced CMOS-based detectors, including a prototype sCMOS camera, enhancing data acquisition capabilities.
The project also investigated fundamental processes in materials through theoretical and experimental methods. The Centre National de la Recherche Scientifique (CNRS) explored post-collision interactions in Auger spectroscopy, while studies on charge transfer mechanisms in thiophene-based polymers advanced understanding of ultrafast electron dynamics. Elettra Sincrotrone Trieste (ELETTRA) focused on the dynamics of perovskites and developed super-resolution microscopy techniques in the EUV range.
In addition to material investigations, theoretical modeling led by groups at Stockholm University (SU) and the Max-Planck-Gesellschaft zur Förderung der Wissenschaften (MPG) explored ultrafast processes in various systems. This included work on charge transfer dynamics, non-adiabatic processes involving conical intersections, and research into attosecond magnetization dynamics, which revealed notable spin phenomena in non-magnetic materials.
Overall, the SMART-X project significantly advanced the field of ultrafast X-ray spectroscopy, laying the groundwork for future explorations of complex materials and ultrafast processes. Each participating institution contributed to a more comprehensive understanding of electron dynamics, paving the way for novel applications in electronics, energy materials, and beyond.
