Journal
PHYSICAL REVIEW LETTERS
Volume 93, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.163002
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We report on a sub-20-fs transient absorption study of the S-2(1(1)B(u)(+))-->S-1(2(1)A(g)(-)) internal conversion in a series of carotenoids with a number of conjugated double bonds (N) ranging from 5 to 15. For the longer carotenoids (Ngreater than or equal to9), the measurements reveal the existence of an additional intermediate excited state lying between the optically allowed S-2 state and the lower-lying forbidden S-1 state. This state enables us to explain the nonmonotonic dependence of the S-2-->S-1 conversion rate on N and is expected to play an important role in photosynthetic light harvesting.
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