I-Electron paramagnetic resonance (EPR) iwuhlobo lobuchwepheshe be-magnetic resonance oluvela kumzuzu kazibuthe wama-electron angasebenzi. Ingasetshenziselwa ukuthola ngekhwalithi nangokwenani ama-electron angabhanqiwe aqukethwe kuma-athomu noma ama-molecule ezinto, bese uwahlola. Izici zesakhiwo sendawo ezungezile. Kuma-radicals amahhala, umzuzu kazibuthe we-orbital cishe awunawo umthelela, futhi iningi lesikhathi sikazibuthe esiphelele (ngaphezu kwama-99%) sinomthelela ku-electron spin, ngakho-ke i-electron paramagnetic resonance ibizwa nangokuthi "i-electron spin resonance" (ESR).

I-electron paramagnetic resonance yatholwa okokuqala yisazi sefiziksi sangaphambili saseSoviet u-E·K·Zavois ngo-1944 kusukela ku-MnCl2, CuCl2 namanye ama-paramagnetic salts. Izazi zefiziksi ziqale zasebenzisa le ndlela ukutadisha ukwakheka kwe-elekthronikhi, ukwakheka kwekristalu, umzuzu we-dipole, kanye nesakhiwo samangqamuzana ama-athomu athile ayinkimbinkimbi. Ngokusekelwe emiphumeleni yezilinganiso ze-electron paramagnetic resonance, osokhemisi bacacisa amabhondi amakhemikhali kanye nokusatshalaliswa kwe-electron density kumakhompiyutha ezinto eziphilayo eziyinkimbinkimbi, kanye nezinkinga eziningi ezihlobene nendlela yokusabela. U-American B. Commoner et al. yethula ubuchwepheshe be-electron paramagnetic resonance emkhakheni webhayoloji okokuqala ngqa ngo-1954. Babona ukuba khona kwama-radicals mahhala kwezinye izinto zezitshalo nezilwane. Kusukela ngawo-1960, ngenxa yokuthuthukiswa okuqhubekayo kwezinsimbi kanye nokusungulwa okusha okuqhubekayo kobuchwepheshe, ubuchwepheshe be-electron paramagnetic resonance busetshenziswe ku-physics, semiconductors, chemistry, i-organic chemistry, i-radiation chemistry, ubunjiniyela bamakhemikhali, i-chemistry yasolwandle, ama-catalysts, biology, kanye isayensi yezinto eziphilayo. Isetshenziswe kabanzi emikhakheni eminingi efana namakhemikhali, imithi, isayensi yezemvelo, kanye ne-geological prospecting.