Abstract

Three excited states of carotenoids are involved in photosynthetic systems in two major ways: (i) light-harvesting in which radiation energy is absorbed via the allowed 1Bu ← 1Ag transition and subsequently transferred through the 21Ag excited state and (ii) protection from photodamage through the formation of the excited 3Bu state. The energetic positions and population dynamics of these excited electronic states are of importance to understand the biochemical function of carotenoids. In this study, picosecond time-resolved resonance Raman (PTR3) spectroscopy is used to measure the vibrational spectra and population dynamics of the excited 21Ag and 3Bu states and the 1Ag ground state of the in vivo and in vitro carotenoids of photosynthetic bacteria.KeywordsPhotosynthetic BacteriumExcited Electronic StateProbe LaserVibrational SpectroscopyPhotosynthetic SystemThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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