Linked from
The 19 pages that link to Electron paramagnetic resonance, each with the reason it gives.
Electron spinRelated: It measures spin transitions to identify radicals and paramagnetic centers.
ParamagnetismRelated: It measures unpaired electrons in paramagnetic atoms, molecules, and defects.
Free radicalRelated: Its signal provides direct evidence for unpaired electrons in radicals.
Color centerRelated: It can identify the unpaired electrons responsible for particular centers.
Larmor precessionRelated: Its resonance condition is set by electron-spin Larmor precession.