In our spin-resolving setup, we apply pump-probe-photoelectron spectroscopy to investigate how the electronic spin polarization reacts to the excitation by a laser pulse. Our research topics range from the spin-dependent lifetimes and scattering rates in unoccupied surface states to laser-driven phase transitions beyond thermal equilibrium. Investigations on the spin structure of topological insulators are planned and currently in preparation (for further information see: Projects/Themis).