Abstract
Abstract The two-photon fluorescence excitation spectrum of LH2, measured by directly exciting the carotenoid S 1 transition and monitoring fluorescence from the bacteriochlorophyll, provides the first direct experimental verification of carotenoid S 1 to bacteriochlorophyll energy transfer. It also provides an estimate of the in situ spheroidene S 1 transition energy of 13 900±150 cm −1 , slightly red-shifted from solution estimates. The relative abilities of the carotenoids spheroidene (10 conjugated double bonds) and rhodopin glucoside (11 conjugated double bonds) to transfer energy via their S 1 states are discussed in terms of spectral overlap factors and competing processes such as S 1 →S 0 internal conversion.
Published Version
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