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The Raman, IR and FIR spectra of polycrystalline samples of the polysulfides Na 2 S 4 , K 2 S 5 , Na 2 S 5  have been measured. A unique assignment of the internal vibrations of the tetrasulfide ion could be achieved.

Raman- und IR-Spektren von festen Alkali-Polysulfiden.: Raman and IR Spectra of Solid Alkalimetalpolysulfides