Development of Laser Heating for Sound Velocity Measurements at High P and T

该奖项支持仪器和技术的发展，以实现在极高压力和温度下测量矿物和其他固体中的声波速度，这是地球深处的特征。该技术将激光加热的金刚石砧细胞与布里渊光谱相结合。这项技术的发展将产生在以前从未获得过的条件下材料的地震速度的直接信息。将对被认为是地球深层内部成分的材料进行实验，并将实验结果与地震学研究获得的地球速度结构信息进行比较。结果将对地球深处的化学成分、地球的热结构以及地球的演化过程产生重要的新见解。该设施将允许在极端温度和压力条件下测量各种固体材料（不仅仅是矿物）的物理性质，因此准备为材料科学和地球科学领域做出重大贡献。布里渊散射测量将尝试温度高达2500开尔文，而样品同时保持在高达50 GPa的压力下。最初的实验将集中在仔细表征温度/压力环境（包括考虑热压力），确定方法中的误差来源，并开发技术以尽可能地进行最准确的测量。＊＊＊

0002021BassThis award supports the development of instrumentation and techniques to enable the measurement of acoustic wave velocities in minerals and other solids at extremely high pressures and temperatures that are characteristic of the Earth's deep interior. The technique will couple the laser heated diamond anvil cell with Brillouin spectroscopy. Development of this technology will yield direct information on the seismic velocities in materials under conditions that have never before been attained. Experiments will be obtained on materials that are thought to be constituents of the Earth's deep interior, and the results will be compared with information on the velocity structure of the Earth as obtained from seismological studies.Results should yield significant new insights on the chemical composition of the Earth at depth, the thermal structure of the Earth, and Earth's evolution through time. The facility will allow measurement of the physical properties of a variety of solid materials (not just minerals) under extreme temperature and pressure conditions, and therefore is poised to make significant contributions to the field of materials science as well as earth science. Brillouin scattering measurements will be attempted to temperatures of up to 2500 Kelvin, while the sample is simultaneously held at pressures of up to 50 GPa. Initial experiments will concentrate on careful characterization of the temperature/pressure environment (including accounting for thermal pressure), identifying sources of error in the method, and developing techniques for making the most accurate measurements possible. ***