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12 October 2006 Terahetz spectroscopy of molten sulfur using a tunable THz source
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Proceedings Volume 6373, Terahertz Physics, Devices, and Systems; 637307 (2006)
Event: Optics East 2006, 2006, Boston, Massachusetts, United States
We have studied the liquid-liquid allotropic transitions in molten sulfur using terahertz (THz) spectroscopy. Liquid sulfur is selected as an initial choice of materials because its structure and properties are well established from previous in-situ studies by one of the current investigators (and by other researchers) using a variety of physical and chemical methodologies. It is known that sulfur melts to an equilibrium mixture of octameric (S8) rings and short chains, with a small concentration of hexameric rings (S6). As temperature is increased, thermal energy initiates ring scission and the resulting diradically-terminated short chains undergo covalent bonding to induce polymerization at 159-166°C. Further increase in temperature causes an increase in chain length and an increase in chain species concentration until a temperature of 188°C is reached at which the long chains (~106 atoms in length) undergo chain scission, and although the chains start to break up, the polymer concentration of the mixed phases still increases. We have experimentally mapped THz absorption, transmission, and reflection/scattering effects with these known transitions in liquid sulfur, as a function of temperature and wavelength.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Mross, T. Lowell, C. Guertin, A. O'Donnell, and G. C. Vezzoli "Terahetz spectroscopy of molten sulfur using a tunable THz source", Proc. SPIE 6373, Terahertz Physics, Devices, and Systems, 637307 (12 October 2006);

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