title: Excited state annihilation in the photosynthetic unit.
abstract: The kinetics of the in vivo fluorescence decays and fluorescence yields, as a function of excitation intensity, have been analysed with a model using excited state annihilation and time-dependent quenching processes. Triplet states, formed in the singlet-singlet annihilation processes, account for additional quenching of singlet states and the persistence of annihilation at longer times than the fluorescence life-time. Together these processes give a satisfactory account of existing experimental data of the intensity dependence of fluorescence in vivo.
mesh_terms: D002734:Chlorophyll; D002736:Chloroplasts; D004058:Diffusion; D004735:Energy Transfer; D005453:Fluorescence; D008954:Models, Biological; D010788:Photosynthesis
chemical_list: D002734:Chlorophyll