Electrical conductivity of liquid deuterium under laser-driven shock loading
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摘要: 液氘在高压下有丰富的电学光学性质。利用反射率和相对介电函数关系并从广义极化角度出发初步建立了计算低Z材料电导率的简易模型；在神光-Ⅱ装置上利用第九路激光冲击加载液氘材料并测量了其在强激光冲击下的高压状态参数和反射率。结合上述理论模型和实验，研究了高压下液氘的电离度和电导率。结果表明，液氘在约70 GPa时的电导率约为2.87105 (Wm)-1，已呈现出较为明显的金属电导特性。显然，冲击加载下液氘从绝缘分子态开始电离并向金属氘转变发生在更低的压强。Abstract: Liquid hydrogen and deuterium have abundant electrical and optical properties at high pressure. A simple model to calculate the conductivity of low-Z materials was constructed. Combining the model with experiment, this paper introduces the study of the ionization and conductivity of liquid deuterium at around 70 GPa. The results show that, deuterium at this range of pressure has an ionization about 0.067%, conductivity about 2.87105（Wm)-1, which means the shocked deuterium reaches a conducting state with characteristic of metallic fluid. Apparently, the transition from the insulating molecular state to metallic state of deuterium begins at a lower pressure.
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