1. London;Hatchard;Sex,1956
2. on this subject see jr New York;Calvert;Phys Chem,1966
3. These authors claim to have observed the triplet sensitized reaction from solvent in benzene solutions of The participation of the benzene triplet is however purely speculative;Samokhvalova;Akad Nauk SSSR,1967
4. Sensitizer triplet energies are taken from A Transfer and Organic Photochemistry Interscience New York;Lamola;Energy,1969