2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151884A new mechanism for the primary photoinduced charge separation in photosynthesis is proposed. It involves as real intermediate between the excited special pair state P* and the primary charge separated state P+HL- a trip-trip-singlet PTBLT, which consists of a triplet on the dimer P and a further triplet on the monomer BL. Both combine to a singlet. The electron transfer is caused by spin exchange couplings. The transient spectrum of the short lived intermediate, formerly taken as evidence for the charge transfer state P+BL-, is reinterpreted as a transient excitation of this trip-trip singlet.12 pages Latex, 5 postscript figures, accepted for publication by Europ. Biophys. J. (1997)Soft Condensed Mattertext