EPR / ESR Spectroscopy
This is the main instructional portal for EPR/ESR spectroscopy at Monmouth College. EPR (Electron Paramagnetic Resonance) is also referred to as ESR (Electron Spin Resonance). From my (bes) ~20 years of EPR/ESR experience, researcher who study the unpaired electrons in organic molecules generally use the term ESR, whereas those who study unpaired electrons in metals use the term EPR. Some believe that the term ESR is outdated and that the term EPR should be used exclusively.