Abstract
Introduction The light-harvesting (LH) pigment-proteins of photosynthetic purple bacteria have been extensively studied with picosecond [1] and now recently with femtosecond [2] pulses. These investigations have helped to make these pigments to the probably best studied and characterized LH systems. Several bacteria, including the presently studied species Rhodobacter sphaeroides, contain two types of LH pigments, a core LH1 antenna surrounding the photochemical reaction centers and a more peripheral LH2 antenna. Both these LH pigments are believed to be organized in small minimum units of 2-4 polypeptides holding about the same number of chromophores, which aggregate to form the network of the intact antenna. Energy transfer between minimum units is believed to occur in a non-coherent hopping fashion. Interaction within a unit is probably quite strong and spectral evidence suggest that it should be characterized as strong exciton interaction leading to the formation of delocalized exciton states. In this report we will mainly be concerned with the ultrafast dynamics within such a minimum unit.
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