Development of in-situ high-pressure and -temperature chemical analysis technique by femto-second laser-induced breakdown spectroscopy

板状衍生流体可能含有大量的硅酸盐成分，但这种流体很难淬灭，其成分也不能精确测定。在这项研究中，我提出了一种新的高压和高温条件下流体化学分析的原位方法。该方法将脉冲激光束聚焦在金刚石顶砧细胞内的小面积样品上。等离子体将产生，然后等离子体冷却形成中性原子。然后原子固有的特征波长光将被发射出来。通过分析这种光，我们可以确定DAC中流体的化学成分。为了评价所提出的方法，介绍了外加热DAC、单色计、门控增强器和CCD探测器以及皮秒激光器。迄今为止，使用外加热DAC产生高压和温度流体，但尚未检测到DAC中的激光诱导等离子体光。

Slab-derived fluids can contain substantial amounts of silicate components, but it is difficult to quench such fluids, and its composition can not be determined precisely. In this study, I proposed a novel in-situ method for chemical analysis of fluid under high pressure and temperature conditions. In this method, pulsed laser beam is focused in small area of sample within diamond anvil cell (DAC). Plasma will be produced, and then plasma cools down to form neutral atoms. Then characteristic wavelength light inherent to atoms will be emitted. By analyzing this light, we can determine chemical composition of the fluid in DAC.To evaluate this proposed method, externally-heated DAC, monochrometer, gated-intensifier and CCD detector, and pico-second laser are introduced, So far, high-pressure and temperature fluids have been produced using externally heated DAC, but laser induced plasma light in DAC has not been detected yet.