LOW-TEMPERATURE AND HIGH-PRESSURE RAMAN STUDIES ON CRYSTALLINE S-6

We have investigated by means of conventional Raman spectroscopy the t emperature and pressure dependence of internal and external vibrations of crystalline S-6. For the low temperature measurements we used chem ically prepared S-6, For the high pressure experiments we produced S-6 from p-S in a high pressure diamond anvil cell. We systematically mea sured the temperature and pressure dependence of frequencies and inten sities of internal and external modes and improved the mode assignment .