Stimulated and dynamic nuclear polarisation in photochemical radical reactions

Highly sensitive time-resolved magnetic resonance techniques, based on the influence of radio-frequency and switching magnetic fields on the nuclear p olarization diamagnetic radical products are considered. The applications o f these methods to the investigation of short-lived radical intermediates ( radical pairs, biradicals, free radicals and radical-ions) formed in photoc hemical reactions in homogeneous and molecular-organised media are discusse d.