Abstract X-ray absorption spectroscopy (XAS) is presently a powerful and established tool to investigate solid and liquid matter at high pressure and high temperature (HP-HT). HP-HT XAS experiments rely on high pressure technology whose continuous development has extended the achievable range up to 100 GPa and more. In high pressure devices, high temperature conditions are typically obtained by using internal and external resistive heaters or by laser heating. We have recently developed a novel design for an internally heated diamond anvil cell (DAC) allowing XAS measurements under controlled high temperature conditions (tested up to about 1300 K). The sample in the new device can be rapidly heated or cooled (seconds or less) so the cell is suitable for studying melting/crystallization dynamics when coupled with a time-resolved XAS setup (second and sub-second ranges). Here we describe the internally heated DAC device which has been realized and tested in experiments on pure selenium at the energy dispersive ODE beamline of Synchrotron SOLEIL. We also present results obtained in XAS experiments of elemental Se using a large volume Paris-Edinburgh press, as an example of the relevance of structural studies of matter under extreme conditions.

中文翻译：

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用于极端条件下 X 射线吸收实验的高温金刚石砧座的开发

摘要 X 射线吸收光谱 (XAS) 是目前在高压和高温 (HP-HT) 下研究固体和液体物质的强大而成熟的工具。HP-HT XAS 实验依赖于高压技术，该技术的不断发展已将可达到的范围扩展到 100 GPa 甚至更多。在高压设备中，高温条件通常是通过使用内部和外部电阻加热器或通过激光加热来获得的。我们最近为内部加热的金刚石砧座 (DAC) 开发了一种新颖的设计，允许在受控高温条件下进行 XAS 测量（测试高达约 1300 K）。新设备中的样品可以快速加热或冷却（几秒或更短），因此当与时间分辨 XAS 设置（秒和亚秒范围）相结合时，该单元适用于研究熔化/结晶动力学。在这里，我们描述了内部加热 DAC 设备，该设备已在同步加速器 SOLEIL 的能量色散 ODE 光束线的纯硒实验中实现和测试。我们还展示了使用大容量巴黎爱丁堡印刷机在元素 Se 的 XAS 实验中获得的结果，作为极端条件下物质结构研究相关性的一个例子。