Vibrational Relaxation in Carotenoids in vivo and in vitro: Picosecond Time-Resolved Anti-Stokes Resonance Raman Spectroscopy
The transient population of excited electronic states in carotenoids is a fundamental part of the photophysical mechanism by which carotenoids contribute to the biochemical function of the pigment-protein complexes in photosynthetic organella. Whereas the roles of electronic state in the overall relaxation mechanism have begun to emerge , the contributions and even the presence of vibrationally-excited levels in the relaxation mechanism has remained largely unexplored. In this study, the vibrationally-excited populations in the in vivo and in vitro carotenoids are examined in real time using picosecond time-resolved anti-Stokes resonance Raman scattering.
KeywordsRelaxation Mechanism Excited Electronic State Probe Laser Vibrational Relaxation Resonance Raman Spectrum
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