What is EPR?
EPR (Electron Paramagnetic Resonance) is a spectroscopic technique which detects species that have unpaired electrons. It is also often called ESR (Electron Spin Resonance). A large number of materials have unpaired electrons. These include free radicals, many transition metal ions, and defects in materials. Free electrons are often short-lived, but still play crucial roles in many processes such as photosynthesis, catalysis, and polymerization. As a result EPR crosses several disciplines including: chemistry, physics, biology, materials science, medical science and many more.
