Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) is one of the most informative techniques on the electronic structure of paramagnetic species. EPR spectroscopy is particularly suitable for the investigation of (bio)chemical systems with strongly localized spin density and their interaction with the environment. For these systems EPR provides information on the structure and dynamics and is widely used in chemistry, physics and biology.
EPR measurements are typically performed in continuous-wave (cw) or in pulsed mode. The cwEPR spectrometer (see image) applies a magnetic field of about 3500 G (0.35 T) and measures the absorption of microwaves in the 9-10 GHz regime (X-Band). Usually, the microwave is kept at a fixed frequency and the magnetic field is swept (for the X-Band, from 0 mT - 700 mT).
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