Vibrational relaxation in the 2A g - (S 1 ) state of all - trans -lycopene, which takes place in a time scale slower than that of internal conversion, has been found by picosecond time-resolved absorption spectroscopy: The time-resolved S n (2B u + ) ← S 1 (2A g - ) absorption spectra of this carotenoid in quinoline and CS 2 solutions can be explained in terms of vibrational structures originating from the C C (ν 1 ) and C−C (ν 2 ) stretching modes, and the time scales of vibrational relaxation ( k ν 1 and k ν 2 defined for the lowest vibrational transition) relative to that of internal conversion ( k ) are estimated by spectral simulation; the values of k ν 1 / k and k ν 2 / k are around 0.6 and 0.3 in the quinoline solution and 0.2 and 1.6 in the CS 2 solution. The slower vibrational relaxations are discussed in light of the light-harvesting function of carotenoids in photosynthesis.
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Zhang et al. (1998) studied this question.
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