The Electron Paramagnetic Resonance Phenomenon

The principle of a spectroscopy experiment is described and the various spectroscopic techniques are reviewed, focusing on the information that can be obtained from the shape and intensity of spectra. Expressions for the electron magnetic moment are then presented, and paramagnetic centers are defined, highlighting their diversity. The principle of an EPR experiment is presented, along with a general expression for the absorption signal at thermal equilibrium. Finally, the functioning of a continuous-wave spectrometer is also explained.