We performed powder x-ray experiments on hydrogen sulfide (H2S) under high pressure at room and low temperatures. Phase V appearing above 27 GPa at room temperature was confirmed by x ray to be associated with a molecular dissociation. The molecular dissociation was first observed at 150 K at a higher pressure around 43 GPa. Two new low-temperature high-pressure phases III' and IV' were discovered. Spiral chains of sulfur atoms are found in both phases as well as in phase IV.
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