importance for laser spectroscopy of relativistic ion beams in the ESR, HESR and CRYRING, and, in addition, for investigations of cold, trapped ions in ion traps. In the framework of this BMBF research c [...] structure and dynamics of highly charged ions, and on the other hand by tests of fundamental constants. The laser-spectroscopic investigations range from heavy ions at relativistic velocities in storage rings [...] websites of the individual collaboration partners, as listed below. Laser spectroscopy of highly charged ions and exotic atoms is an important part of the current GSI atomic physics research program, and will