Computer simulations of FEL-excited matter

We apply continuum approach to follow the dynamics of irradiated complex samples. First we discuss its advantages and limitations when compared to other modeling methods. We then apply this approach to describe the data on irradiated clusters and laser-created plasmas that were recorded at the free-electron-laser (FEL) FLASH facility at DESY in Hamburg. We show a good agreement between experimental results and our theoretical estimates. Finally we give an outlook on applying the continuum approach (combined with tight binding molecular dynamics technique) to describe ultrafast transitions occurring in FEL-excited solids.