Electron paramagnetic resonance (EPR) ndi mtundu waukadaulo wa maginito oyambira kuchokera ku nthawi yamaginito ya ma elekitironi osalumikizana. Itha kugwiritsidwa ntchito kuti izindikire ma elekitironi osagwirizana ndi ma atomu kapena mamolekyu azinthu, ndikuwunika. Makhalidwe amapangidwe a chilengedwe chozungulira. Kwa ma radicals aulere, mphindi ya orbital maginito ilibe mphamvu, ndipo nthawi yambiri ya maginito (pamwamba pa 99%) imathandizira kuti ma elekitironi azizungulira, choncho electron paramagnetic resonance imatchedwanso "electron spin resonance" (ESR).

Electron paramagnetic resonance idapezeka koyamba ndi katswiri wakale wa sayansi ya zaku Soviet E·K·Zavois mu 1944 kuchokera ku MnCl2, CuCl2 ndi mchere wina wa paramagnetic. Akatswiri a sayansi ya zakuthambo adagwiritsa ntchito njirayi pophunzira zamagetsi, mawonekedwe a kristalo, mphindi ya dipole, ndi mamolekyu a maatomu ena ovuta. Kutengera zotsatira za kuyeza kwa ma electron paramagnetic resonance, akatswiri a zamankhwala adafotokozera zamagulu amagetsi ndi kachulukidwe ka ma elekitironi mumagulu ovuta a organic, komanso mavuto ambiri okhudzana ndi momwe amachitira. American B. Commoner et al. anayambitsa luso la ma elekitironi paramagnetic resonance ku gawo la biology kwa nthawi yoyamba mu 1954. Anawona kukhalapo kwa zida zaufulu m'zinthu za zomera ndi zinyama. Kuyambira zaka za m'ma 1960, chifukwa cha kupititsa patsogolo kwa zida ndi luso lopitiliza luso lamakono, teknoloji ya electron paramagnetic resonance yakhala ikugwiritsidwa ntchito mu physics, semiconductors, organic chemistry, complex chemistry, radiation chemistry, chemical engineering, marine chemistry, catalysts, biology, ndi biology. Zakhala zikugwiritsidwa ntchito kwambiri m'magawo ambiri monga chemistry, mankhwala, sayansi ya chilengedwe, ndi geological prospecting.