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64 Ralf Steudel · Bodo Eckert Fig. 23 Evolution of the Raman spectra during a high-pressure low-temperature experi- ment on elemental sulfur (from top to bottom, factor of magnification of the intensity scale is indicated). The wavenumber range of characteristic vibrations in sulfur is shown in the case of a-S8 (wavelength of the laser: 515 nm; power density at the sample: ca. 150 W m2). Starting with a-S8 the onset of amorphization is seen at about 5 GPa, the transformation to p-S occurred at about 6 GPa, upon further increasing the pressure and cooling down the sample a transformation to S6 took place. At low temperatures, the transition p-S!S6 is thermally hindered resulting in a larger background scattering due to structural reorientation. Plasma lines of the Ar ion laser are marked by asterisksPDF Image | Topics in Current Chemistry
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