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arXiv 2004.07496physics.chem-ph
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高压碘分子修饰

Iodine molecule modifications with high pressure

Jingming Shi, Emiliano Fonda, Silvana Botti, Miguel A. L. Marques, Toru Shinmei, Tetsuo Irifune, Anne-Marie Flank, Pierre Lagarde, Alain Polian, Jean-Paul Itié, Alfonso San-Miguel

摘要:

金属化和解离是高密度双原子分子的关键转变,对于巨行星的建模特别重要。使用X射线吸收光谱和原子模型,我们表明,在卤素,形成的\textit{connected}分子结构发生在压力远低于金属化。在这里,我们表明,碘双原子分子首先伸长$\sim$ 0.007 Ω ~达到$P_c$ $\backsim$ 7~GPa的临界压力,在分子之间形成键。当压力达到15-20 GPa时,其长度继续减小。卤素的普遍趋势,并允许预测氯的压力为42 $\pm$ 8 GPa的分子键长反转。我们的研究结果解决了高压下双原子分子相的分子不变性范式,并可能推广到宇宙中其他丰富的双原子分子,包括氢。

英文摘要:

Metallization and dissociation are key transformations in diatomic molecules at high densities particularly significant for modeling giant planets. Using X-ray absorption spectroscopy and atomistic modeling, we demonstrate that in halogens, the formation of a \textit{connected} molecular structure takes place at pressures well below metallization. Here we show that the iodine diatomic molecule first elongates of $\sim$0.007 Å~up to a critical pressure of $P_c$ $\backsim$7~GPa developing bonds between molecules. Then its length continuously decreases with pressure up to 15-20~GPa. Universal trends in halogens are shown and allow to predict for chlorine a pressure of 42$\pm$8~GPa for molecular bond-length reversal. Our findings tackle the molecule invariability paradigm in diatomic molecular phases at high pressures and may be generalized to other abundant diatomic molecules in the universe, including hydrogen.

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