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High-pressure Raman study of solid hydrogen up to 300 GPa

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O734[理学—晶体学] U469.722[机械工程—车辆工程;交通运输工程—载运工具运用工程;交通运输工程—道路与铁道工程]
作者机构：State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
相关基金：Project supported by the National Basic Research Program of China （Grant No. 201 ICB808200）, the Program for Changjiang Scholars and Innovative Research Team in University, China （Grant No. IRT1132）, the National Natural Science Foundation of China （Grant Nos. 51032001, 11074090, 10979001, 51025206, 11274137, 11474127, and 11504127）, the National Found for Fostering Talents of Basic Science, China （Grant No. J1103202）, and the China Postdoctoral Science Foundation （Grant No. 2015M570265）.

关键词：高压拉曼光谱, 固态氢, 原位拉曼光谱, 相互作用, 结构方案, 材料结构, 加压力, III

中文摘要：

The high-pressure behavior of solid hydrogen has been investigated by in situ Raman spectroscopy upon compression to 300 GPa at ambient temperature. The hydrogen vibron frequency begins to decrease after it initially increases with pressure up to 38 GPa. This softening behavior suggests the weakening of the intramolecular bond and the increased intermolecular interactions. Above 237 GPa, the vibron frequency softens very rapidly with pressure at a much higher rate than that of phase III, corresponding to transformation from phase III into phase IV. The phase transition sequence has been confirmed from phase I to phase III and then to phase IV at 208 and 237 GPa, respectively. Previous theoretical calculations lead to the proposal of an energetically favorable monoclinic C2/c structure for phase III and orthorhombic Pbcn structure for phase IV. Up to 304 GPa, solid hydrogen is not yet an alkali metal since the sample is still transparent.

英文摘要：

The high-pressure behavior of solid hydrogen has been investigated by in situ Raman spectroscopy upon compression to 300 GPa at ambient temperature. The hydrogen vibron frequency begins to decrease after it initially increases with pressure up to 38 GPa. This softening behavior suggests the weakening of the intramolecular bond and the increased intermolecular interactions. Above 237 GPa, the vibron frequency softens very rapidly with pressure at a much higher rate than that of phase HI, corresponding to transformation from phase III into phase IV. The phase transition sequence has been confirmed from phase I to phase III and then to phase IV at 208 and 237 GPa, respectively. Previous theoretical calculations lead to the proposal of an energetically favorable monoclinic C2/c structure for phase HI and orthorhombic Pbcn structure for phase IV. Up to 304 GPa, solid hydrogen is not yet an alkali metal since the sample is still transparent.