A brief overview of Electron Paramagnetic Resonance spectroscopy

This chapter provides a background on electron paramagnetic resonance (EPR) spectroscopy, which is a magnetic resonance technique used for the study of systems containing unpaired electrons. It explains how EPR systems are paramagnetic and attracted by magnetic fields. It also reviews the applications of EPR in a wide variety of gaseous, liquid, and solid samples and confined to systems bearing unpaired electrons. The chapter outlines basic principles and the underlying physics of EPR. These are similar to those encountered in nuclear magnetic resonance (NMR). It points out how EPR and NMR techniques deal with the interaction of electromagnetic radiation with inherent magnetic moments within the sample.