Upgrade of microRaman spectrometer for in-situ, high-temperature and high-pressure experiments

奖励资金将用于升级用于显微拉曼光谱的激励激光器，该光谱在高温高压下对矿物、熔体和流体的实验表征中发挥着核心作用。这些数据对于我们理解固体地球、海洋和大气的形成和演化至关重要。最重要的研究领域是：1.熔体和流体中硅酸盐-C-O-H-N组分的结构和分配，以推进地球和类地行星中涉及流体和熔体的输运性质和过程的模拟。2.高温高压下COH流体的状态方程和结构。3.高温高压下稳定同位素在矿物、熔体和流体之间的分配特征。4.水热环境中COH流体的结构形态和同位素组成这些目标是通过使用外部加热的水热金刚石顶压室(HDAC)和用振动(拉曼和红外)光谱方法探测样品来实现的。HDAC用于样品容器，在所需的温度、压力和氧化还原条件下对样品进行原位光谱测量；可以同时通过钻石窗口进行光学观察。

Award funds will be used to upgrade the excitation laser used for microRaman spectroscopy, which plays a central role in experimental characterization of minerals, melts, and fluids at high temperature and pressure. These data are central to our understanding of the formation and evolution of the solid Earth, its oceans, and atmosphere. The most important research areas are: 1. Structure of silicate-C-O-H-N components in and partitioning between melt and fluid to advance modeling of transport properties and processes that involve fluids and melts in the Earth and terrestrial planets. 2. Equation-of-state and structure of COH fluids at high temperature and pressure. 3. Characterization of stable isotope partitioning between minerals, melts, and fluids at high temperature and pressure. 4. COH fluid structural speciation and isotopologues in hydrothermal environments These objectives are reached by using externally-heated hydrothermal diamond anvil cells (HDAC) and probing the samples with vibrational (Raman and infrared) spectroscopic methods. The HDAC is employed for sample containment wherein in-situ spectroscopic measurements with samples at desired temperature, pressure, and redox conditions are carried out; optical observations can be made at the same time through the diamond windows.