Abstract
Polarized Raman spectra are measured for Se species incorporated into one-dimensional channels of AlPO 4-5 (AFI) single crystal. The optical phonon modes of Se AFI are observed to be shifted to higher frequencies from that of a trigonal Se crystal, because of the loss of inter-chain interactions in the Se AFI . Sharp Raman signals show that the Se species is of high crystallinity. By symmetry analysis of the polarized Raman spectra, we deduce the Se species in the AFI channels to be of helical chain structure with D 3 symmetry.
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