ABSTRACT We present the first application of double-stage diamond anvil cells (ds-DACs) to X-ray absorption spectroscopy (XAS) of Rhenium (Re) metal. By using highly stable and sub-micron sized X-ray beam, XAS spectra were successfully observed at the -edges from the sample encapsulated in the small space between the second-stage anvils. The pressure generation exceeding 300 GPa was evaluated by the pressure-induced shift of extended X-ray absorption fine structure (EXAFS) oscillation at the -edge. The profile of white-line at the -edges broadened with increasing pressure, which indicates the modification of the Re band structure. The present results demonstrate the high ability of XAS technique combined with ds-DACs as a probe for crystal structure and electronic structure under ultrahigh pressure.

中文翻译：

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NPD 在双级金刚石砧座中的应用：300 GPa 以上高压下铼金属的 XAS 光谱

摘要 我们首次将双级金刚石砧座单元 (ds-DAC) 应用于铼 (Re) 金属的 X 射线吸收光谱 (XAS)。通过使用高度稳定的亚微米级 X 射线束，成功地在封装在第二级砧座之间的小空间中的样品边缘观察到 XAS 光谱。超过 300 GPa 的压力产生是通过压力引起的扩展 X 射线吸收精细结构 (EXAFS) 振动在 - 边缘的位移来评估的。边缘的白线轮廓随着压力的增加而变宽，这表明 Re 带结构发生了变化。目前的结果表明 XAS 技术与 ds-DAC 结合作为超高压下晶体结构和电子结构的探针的高能力。