Electron Paramagnetic Resonance (EPR) spectroscopy is a method for studying the structure, dynamics, and spatial distribution of unpaired electronic matter. It can provide in-situ and non-destructive information such as electron spins, orbits and nuclei at the micro-scale.
When a substance containing unpaired electrons is placed in a static magnetic field, if a certain frequency electromagnetic wave signal is applied to the sample, the substance’s emission or absorption of electromagnetic wave energy will be observed. By analyzing the law of change to the electromagnetic wave signal, the characteristics of the electron and its surrounding environment can be briefly analyzed, so that the analysis of the material structure and other applications can be performed.
Substances containing unpaired electrons are widely distributed, such as isolated single atoms, conductors, magnetic molecules, transition metal ions, rare earth ions, ion clusters, doped materials, defective materials, biological free radicals, metal proteins, etc .; many substances do not contain unpaired electrons, but will generate unpaired electrons when excited by light. Therefore, electron paramagnetic resonance technology is widely used in physics, chemistry, biology, materials, industry and other fields.