Electron Spin Resonance (ESR) – Principle, Instrumentation, Applications
Electron Spin Resonance (ESR) commonly referred to by the name Electron Magnetic Resonance (EMR) or Electron Paramagnetic Resonance (EPR) is an absorption spectroscopy where radiation with frequencies within the microwave range (0.04 to 25 cm) is absorption by paramagnetic materials to cause changes in the magnetic levels of electrons having unpaired spins.