electron spin resonance (ESR)
Technique of spectroscopic analysis (see spectroscopy) used to identify paramagnetic substances (see paramagnetism) and investigate the nature of the bonding within molecules by identifying unpaired electrons and their interaction with their immediate surroundings. Unpaired electrons, because of their spin, behave like tiny magnets and can be lined up in an applied magnetic field; energy applied by alternating microwave radiation is absorbed when its frequency coincides with that of precession of the electron magnets in the sample. The graph or spectrum of radiation absorbed as the field changes gives information valuable in chemistry, biology, and medicine.
Variants of ELECTRON SPIN RESONANCE (ESR)
electron spin resonance (ESR) or electron paramagnetic resonance (EPR)
This entry comes from Encyclopædia Britannica Concise.
For the full entry on electron spin resonance (ESR), visit Britannica.com.
Seen & Heard
What made you look up electron spin resonance (ESR)? Please tell us what you were reading, watching or discussing that led you here.