Biological

Low-Energy Photoexcited States in Photosynthesis (#117)

The most common model use to design and interpret the operation of organic solar cells is based on the "energy funnel" mechanism established originally for light-harvesting in purple bacteria in which the lowest-energy excited states dominates photochemical charge separation. It is known that this mechanism does not apply to photosystem-I, but over the last 5 years new experiments have shown that photosystem-II has unexpected low-energy excited states that do not participate in the primary photochemical process yet lead to charge separation via a different, unknown, route. These results thus pose a challenge to our fundamental understanding of the operation of photosystem-II. A variety of causes and consequences of the nature of low-lying states in photosynthesis are expected. This symposium will take a holistic view of all photosystems, focusing on newly experimental and computational results. By examining systems in which possible mechanisms involving excitonic states or charge-transfer states are clearly evidenced, inspiration for unsolved problems will be gained. The meeting will also consider the implications of the lowest-energy states for dephasing and coherence properties of photosystems
Last update: Dec 28, 2015