Chemically induced dynamic electron polarization (CIDEP) in nitrogen heterocyclic radicals: a stringent test of polarization theory

Transient ESR spectra are presented of polarized radicals formed following photolysis of quinoxaline, quinoline and pyrazine in solution. Triplet and geminate radical-pair mechanism polarizations are reported and discussed. The phase of the triplet polarization varies with the radical concerned in a manner which confirms the central assumption of the triplet theory.