Reflectance spectroscopy of all-trans (3-carotene in the zeolite, ZSM-5, allows the forbidden So -+ S, transition(1 IA,--+ 2 lAg-) to be detected; hence the S1 energy level is determined for the first t i m e and an estimate of the TI energy level made.Carotenoids are a class of compounds that, together with their oxygenated derivatives, play an important role in a wide range of biological systems.' For example, (3-carotene acts as both a
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