On Monday, the 4th October 2021 the COST Action “Multiscale Irradiation and Chemistry Driven Processes and Related Technologies” (MultIChem) has started. The goal is to extend international and interdisciplinary cooperation regarding the research of multiscale irradiation-driven processes and related technologies. Thus, will lead to considerable scientific and technological breakthroughs and socio-economic impacts. The duration of this action is four years.