Science. 1988 Mar 4;239(4844):1131-4. doi: 10.1126/science.239.4844.1131.
The crystal structure and equation of state of solid hydrogen have been determined directly to 26.5 gigapascals at room temperature by new synchrotron x-ray diffraction techniques. Solid hydrogen remains in the hexagonal close-packed structure under these pressure-temperature conditions and exhibits increasing structural anisotropy with pressure. The pressure-volume curve determined from the x-ray data represents the most accurate experimental measurement of the equation of state to date in this pressure range. The results remove the discrepancy between earlier indirect determinations and provide a new experimental constraint on the molecular-to-atomic transition predicted at higher pressures.
通过新的同步加速器 X 射线衍射技术，直接在室温下将固态氢的晶体结构和状态方程确定到 26.5 吉帕斯卡。在这些压力-温度条件下，固态氢保持六方密堆积结构，并表现出随压力增加的结构各向异性。从 X 射线数据确定的压力-体积曲线代表了在该压力范围内迄今为止状态方程最准确的实验测量。研究结果消除了早期间接测定之间的差异，并为更高压力下预测的分子-原子转变提供了新的实验限制。
