chemically induced dynamic electron polarization (CIDEP)
Non-Boltzmann electron spin-state population produced in thermal or photochemical reactions, either from a combination of radical pairs (called radical-pair mechanism), or directly from the triplet state (called triplet mechanism) and detectable by ESR spectroscopy.
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 313 (