Anti-Stokes and Stokes resonance Raman excitation profiles have been observed for the C C and C−C stretching fundamental bands of carotenoids (β-carotene and canthaxanthin) and analyzed on the basis of the Franck−Condon mechanism. It is shown that such an analysis provides a method for identifying the vibrational levels on which vibrationally excited molecules observed in picosecond pump−probe processes are populated.
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Okamoto et al. (1997) studied this question.
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