Electrostatic force driven helium insertion into ammonia and water crystals under pressure
Electrostatic force driven helium insertion into ammonia and water crystals under pressure
复制标题
静电力驱动氦气在压力下嵌入氨和水晶体中
DOI：
10.1038/s42004-019-0204-6
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发表时间：
2019-09-02
影响因子：
5.9
通讯作者：
Miao, Mao-Sheng
中科院分区：
文献类型：
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作者：
Bai, Yihong;Liu, Zhen;Miao, Mao-Sheng
氦、氨和冰是巨大气体行星的主要成分，因此预测它们的化学结构对预测行星动力学至关重要。在这里，我们展示了一个强大的驱动力，来自于氦与极性分子晶体(如氨和冰)的静电相互作用的交替。结果表明，氨和氦在45 Gpa以上可以形成热力学稳定化合物，而冰和氦在30 0 Gpa以上可以形成热力学稳定化合物。静电相互作用的变化为高压下氦的插入提供了驱动力，但其机制与在氨和冰中发生的机制非常不同。这项工作将氦的反应性扩展到新类型的化合物中，并证明了元素周期表中这种最稳定元素的化学丰富。
Helium, ammonia and ice are among the major components of giant gas planets, and predictions of their chemical structures are therefore crucial in predicting planetary dynamics. Here we demonstrate a strong driving force originating from the alternation of the electrostatic interactions for helium to react with crystals of polar molecules such as ammonia and ice. We show that ammonia and helium can form thermodynamically stable compounds above 45 GPa, while ice and helium can form thermodynamically stable compounds above 300 GPa. The changes in the electrostatic interactions provide the driving force for helium insertion under high pressure, but the mechanism is very different to those that occur in ammonia and ice. This work extends the reactivity of helium into new types of compounds and demonstrates the richness of the chemistry of this most stable element in the periodic table.