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This thesis demonstrates the advancement of PELDOR spectroscopy beyond its original design of distance measurements in order to disentangle a maximum amount of information additionally encoded in the PELDOR data. In particular, the successful synthesis of novel polynitroxide radicals is described as well as the extraction of the relative orientation of spin labels, conformational flexibility and the separation of dipolar and exchange coupling via orientation selective PELDOR measurements in combination with PESIM based simulations. Moreover, the method of PELDOR "Spin Counting" was experimentally validated.