Electron paramagnetic resonance (EPR) bụ ụdị teknụzụ resonance magnetik sitere na oge magnetik nke eletrọn na-enweghị njikọ. Enwere ike iji ya qualitatively na quantitatively chọpụta electrons na-enweghị njikọ dị n'ime atom ma ọ bụ molecules nke ihe, wee nyochaa ha. Njirimara nhazi nke gburugburu ebe obibi. Maka radicals n'efu, oge ndọta orbital enweghị mmetụta ọ bụla, ọtụtụ n'ime oge ndọta zuru oke (n'elu 99%) na-enye aka na ntụgharị elektrọn, yabụ a na-akpọkwa resonance eletrọn “electron spin resonance” (ESR).

Ọka mmụta sayensị Soviet mbụ E·K·Zavois bụ nke mbụ chọtara resonance eletrọn na 1944 site na MnCl2, CuCl2 na nnu paramagnetic ndị ọzọ. Ndị ọkà mmụta sayensị buru ụzọ jiri usoro a mụọ usoro eletrọnịkị, nhazi kristal, oge dipole, na usoro ihe omimi nke ụfọdụ atọm dị mgbagwoju anya. Dabere na nsonaazụ electron paramagnetic resonance nha, chemists dokwuo anya njikọ kemịkalụ na nkesa njupụta elektrọn na ogige organic dị mgbagwoju anya, yana ọtụtụ nsogbu metụtara usoro mmeghachi omume. American B. Commoner et al. ewebata teknụzụ paramagnetic resonance nke elektrọn na ngalaba nke bayoloji na nke mbụ na 1954. Ha hụrụ ịdị adị nke radicals n'ụfọdụ ihe ọkụkụ na anụmanụ. Kemgbe 1960s, n'ihi nkwalite akụrụngwa na-aga n'ihu na teknụzụ teknụzụ na-aga n'ihu, a na-eji teknụzụ paramagnetic resonance elektrọn na physics, semiconductor, kemịkalụ organic, kemịkalụ mgbagwoju anya, kemịkalụ radieshon, injin kemịkalụ, kemịkalụ mmiri, ihe na-akpali akpali, bayoloji, na bayoloji. A na-eji ya eme ihe n'ọtụtụ ebe dị ka kemistri, ọgwụ, sayensị gburugburu ebe obibi, na atụmanya ala.