Organization ofthe Review

The aim ofthis chapter is to review the contribution of resonance Raman spectroscopy to our knowledge of the stereochemistry and electronic structure of carotenoid molecules involved in photosynthesis. However, a precise understanding of the information provided by resonance Raman about carotenoids requires the description of those relevant experiments, which were performed in vitro (usually in organic solvents), and which are at the foundation of our current interpretations ofthe Raman signals. In order to keep this review article as concise as possible, these will be presented after a short introduction on the method itself, and 1 will focus only on biologically relevant results. 

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