https://doi.org/10.1351/goldbook.E02005
Electron @[email protected] @[email protected] (EPR) and/or electron spin @[email protected] (ESR) is defined as the form of @[email protected] concerned with microwave-induced transitions between magnetic energy levels of electrons having a net spin and orbital @[email protected] The term electron @[email protected] @[email protected] and the symbol EPR are preferred and should be used for primary indexing.