Polarized Raman and optical absorption spectra of the mordenite single crystals containing sulfur, selenium, or tellurium in the one-dimensional nanochannels

Polarized Raman and optical absorption spectra of the natural mordenite single crystals containing adsorbed species of sulfur, selenium, or tellurium within one-dimensional channels (diameter of the channel ca. 0.7 nm) have been studied. The bands in the Raman and absorption spectra, which are polarized along the channel direction, are attributed to the helical chains. Experimental evidence is shown for the assignment of other bands to the ring-like molecules S6, S8, Se6, and probably Te6.