Bettina Basel presents experimental conditions which allow to extract the three-spin
contribution precisely from experimental multi-spin double electron-electron resonance (DEER)
signals. The theory and concepts behind the used techniques which are among others broadband
chirp pump pulses over coupling of microwave resonators and echo reduction measurements are
discussed and explained in detail. Moreover the setup and results of DEER experiments with
newly introduced double chirp pump pulses consisting of two separate chirps are shown.
Particular attention is paid to the phenomenon of orientation selection and the concept of
orthogonal spin labeling.
