Abstract.  Spectroscopic investigations of metals, interacting with intense, femtosecond XUV pulses at 13.5 nm wavelength (92 eV photon energy), are presented. The experiments were performed at the FEL FLASH of the DESY lab in Hamburg. Metallic samples are dominantly ionized by direct photo-absorption of inner-shell bound electrons. Processes such as radiative and Auger decays lead to emission of fluorescence radiation as well as bremsstrahlung and ionic line radiation. By applying QMD and Monte-Carlo simulation, we compare our experimental observations with theoretical predictions and gain insight into the complex interaction of metals with intense XUV radiation. This topic shows novel features of isochoric heating of warm dense plasmas by FEL radiation, complementary to heating by optical laser irradiation.