The Raman spectra of all-trans and 15,15′-cis-β,β-carotenes were observed using various laser lines for excitation. Differences, not dramatic but significant, were found between the spectra of the two isomers. With ultraviolet excitations both isomers gave a few bands in the C=C stretching region, whereas a single band was observed with visible excitations.
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Saito et al. (1980) studied this question.
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