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Incorporation of Se into the supercages of zeolite Y leads to formation of Se8 rings and distorted Se chains with a ratio which is dictated by the nature of the zeolitic counter cations. Both rings and chains give rise to characteristic Raman and UV/vis absorption bands. In particular low frequency Raman bands are attributed to phonon localization in ordered segments of distorted chains.
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Goldbach et al. (1997) studied this question.
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