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首页> 外文会议>Conference on Terahertz Physics, Devices, and Systems >Terahertz spectroscopy of molten sulfur using a tunable THz source
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Terahertz spectroscopy of molten sulfur using a tunable THz source

机译：使用可调THz源的熔融硫的太赫兹光谱

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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 (Sg) 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.
机译：我们研究了使用Terahertz（THz）光谱法在熔融硫中的液态液相传转变。选择液体硫作为材料的初始选择，因为它的结构和性质是利用各种物理和化学方法的目前的研究人员（以及其他研究人员）的原位研究。众所周知，硫磺融合成八大数（SG）环和短链的平衡混合物，浓度小的六偏黄环（S6）。随着温度的增加，热能引发戒指群，并将所得的直链封端的短链经历共价键，以在159-166℃下诱导聚合。温度的进一步增加导致链条长度的增加和链条物种浓度的增加，直至达到188℃的温度，在该温度下，长链（长度为106个原子）经过连锁群，虽然链条开始分手，混合阶段的聚合物浓度仍然增加。我们在液态硫中的这些已知的转变具有实验映射的THz吸收，传输和反射/散射效果，作为温度和波长的函数。

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