has two goals: on one hand it studies the development of solid state properties
like crystal structure, photoabsorption behaviour or magnetism as a function
of cluster size. On the other hand clusters can be used as simple model
systems for the examination of fundamental phenomena as e.g. electron-electron
correlation or electron-ion-coupling.
In both cases it is necessary to characterize free mass selected clusters as comprehensively as possible. A number of spectroscopical methods are available for this purpose. In our group mainly photoabsorption spectroscopy and photoelectron spectroscopy is used. The first allows one to study excited states, while the latter can be used to determine the electron density of states of the cluster in the ground state.
Using fs-laser pulses both methods are applied to do time-resolved measurements of ultrafast processes.