I-Electron paramagnetic resonance (EPR) luhlobo lwetekhnoloji yemagnetic resonance evela kumzuzu wemagnethi yee-electron ezingasebenziyo. Ingasetyenziselwa ukufumanisa ngokomgangatho kunye nobungakanani bee-electron ezingabonakaliyo eziqulethwe kwii-athomu okanye iimolekyuli zezinto, kwaye zihlolisise. Iimpawu zesakhiwo sendawo engqongileyo. Kwiiradicals zasimahla, umzuzu wemagnethi we-orbital phantse awunasiphumo, kwaye uninzi lwalo mzuzu uwonke wemagnethi (ngaphezulu kwama-99%) unegalelo kwi-electron spin, ngoko ke i-electron paramagnetic resonance ikwabizwa ngokuba “yi-electron spin resonance” (ESR).

I-Electron paramagnetic resonance yafunyanwa okokuqala yingcali yefiziksi yaseSoviet u-E·K · Zavois ngo-1944 ukusuka kwi-MnCl2, CuCl2 kunye nezinye iityuwa zeparamagnetic. Iingcali zefiziksi ziqale zasebenzisa obu buchule ukufunda ubume be-elektroniki, ubume bekristale, umzuzu we-dipole, kunye nesakhiwo semolekyuli yeeathom ezithile ezinzima. Ngokusekwe kwiziphumo zemilinganiselo ye-electron paramagnetic resonance, iikhemisti zacacisa iibhondi zekhemikhali kunye nokuhanjiswa koxinzelelo lwe-electron kwiikhompawundi ezintsonkothileyo zezinto eziphilayo, kunye neengxaki ezininzi ezinxulumene nendlela yokusabela. UMerika B. Commoner et al. bazisa ubuchwepheshe be-electron paramagnetic resonance kwinkalo yebhayoloji okokuqala ngo-1954. Babona ubukho beeradicals zasimahla kwezinye izityalo nezilwanyana. Ukusukela ngeminyaka yee-1960s, ngenxa yokuphuculwa okuqhubekayo kwezixhobo kunye nokwenziwa ngokutsha kwetekhnoloji, itekhnoloji ye-electron paramagnetic resonance isetyenziswe kwifiziksi, i-semiconductors, i-organic chemistry, ikhemistri entsonkothileyo, ikhemistri yemitha, ubunjineli bekhemikhali, ikhemistri yaselwandle, i-catalysts, ibhayoloji, kunye ibhayoloji. Isetyenziswe ngokubanzi kwiinkalo ezininzi ezifana nekhemistri, iyeza, isayensi yendalo esingqongileyo, kunye ne-geological prospecting.