Pulse EPR and ENDOR studies of light-induced radicals and triplet states in photosystem II of oxygenic photosynthesis

Selected applications of cw and time resolved EPR and ENDOR techniques to study stabilized radical ions, transient radical pairs and triplet states in photosystem II of oxygenic photosynthesis are reviewed. Particular emphasis is placed on the structure and location of the cation radical and the triplet state at the donor side of PS II. Consequences for the initial charge separation process are briefly discussed.