The transfer of an electron from one molecular entity to another, or between two localized sites in the same molecular entity.
See also: inner-sphere electron transfer, outer-sphere electron transfer, Marcus equation
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1110 (https://doi.org/10.1351/pac199466051077)
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2239 (https://doi.org/10.1351/pac199668122223)