Diluted magnetic semiconductors, either in form of thin films or in form of nanostructures have been of great interest in the last years due to the combined magnetic properties from the magnetic elements and the transport properties from the carriers of the host. Especially ZnO is experiencing a renaissance with the incorporation of Mn because of the recent predictions from theory. We have investigated the electronic structure of the ground state Mn²⁺ in ZnO nanocrystals as well as in Zn(OH)₂ by electron paramagnetic resonance (EPR) measurements. For a better assignment to the atomic structure we have complemented the EPR measurements with X-ray absorption spectroscopy (XAS) on Mn and Zn on samples with different particle size and different Mn concentration. Both types of experiments show that Mn substitutes Zn in ZnO as well as in Zn(OH)₂ .

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