Electron paramagnetic resonance

Electron paramagnetic resonance (EPR) is a way scientists use to study tiny, magnetic particles, such as electrons. EPR uses a special machine, called an EPR spectrometer, to make the particles spin around in a magnetic field to get information about them. Scientists can learn things like the size and shape of the particles, how fast they're spinning, and how they interact with each other. This helps scientists understand how things work on the smallest level.