Dictionary
elec'tron spin' res"onance
Physics.
the flipping back and forth between two spin directions of electrons in a magnetic field when electromagnetic radiation of the proper frequency is applied.
Abbr.: ESR Also called
elec'tron paramagnet'ic res"onance, spin resonance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.