Acquisition of an Impulsive Stimulated Light Scattering (ISLS) system for elasticity and thermal conductivity studies

行星材料的弹性和热导率是决定地震波如何传播和地球内部如何交换热量的最基本参数之一。为了研究行星材料在地球深部相关压力-温度条件下的这些性质，将在德克萨斯大学奥斯汀分校地质科学系矿物物理实验室建立脉冲受激光散射系统，并与高压金刚石压腔集成在一起，进行随压力、温度和成分变化的现场测量。这种光谱技术长期以来一直是材料科学和凝聚态物理中研究弹性和热扩散率的重要工具，通过这次仪器的获取，它的潜力将在地球科学研究中得到充分发挥。这些研究将通过对极端环境下行星材料的弹性和运输性质的新知识，增进我们对地球深部地震和地球动力学结构和化学成分的了解。解释地球深部地震结构需要了解组成物质的弹性性质，而导热系数在理解地球深部的动态过程中起着至关重要的作用。因此，确定行星材料在相关条件下的声速和导热系数是矿物物理研究的主要目标。因此，这项研究的结果将广泛影响地球物理和地球动力学领域，因为需要弹性和热导率信息的新方面来令人满意地模拟地球深处的地震、矿物学和地球动力学行为。此外，该系统非常适合研究液体，这对了解挥发分的性质、二氧化碳的封存和其他与地壳浅层有关的热液活动非常重要。在该项目的倡议下，学生和博士后研究人员将有独特的研究机会，使用先进的激光光谱技术来获得破译S内部的地震和地球化学观测所需的实验室结果。这将有助于教育下一代对地球深部有透彻了解的独立研究人员？S。该奖项的推广活动侧重于通过参与推广暑期计划，让K-12年级的学生接触到地球深处的研究。这一奖项的结果将通过教学、研讨会、会议和同行评议的出版物广泛传播。

Elasticity and thermal conductivity of planetary materials are among the most fundamental parameters that govern how seismic waves travel and how heat is exchanged in the interior of the Earth. In order to investigate these properties of planetary materials at relevant pressure-temperature conditions of the deep Earth, an Impulsive Stimulated Light Scattering system will be established and integrated with high-pressure diamond anvil cells for in situ measurements with variation of pressure, temperature, and composition in the Mineral Physics Laboratory at the Department of Geological Sciences, the University of Texas at Austin. This spectroscopic technique has long been an essential tool for studying elasticity and thermal diffusivity in materials sciences and condensed matter physics, and its potentials will be fully exploited in earth science research through this instrumentation acquisition. These studies will improve our understanding of deep-Earth seismic and geodynamic structures and chemical compositions through new knowledge of elastic and transport properties of planetary materials under extreme environments. Interpretation of deep-Earth seismic structures requires knowledge of the elastic properties of component materials, whereas thermal conductivity plays an essential role in understanding the dynamic processes in the deep Earth. It is therefore a primary goal of the mineral physics research to ascertain the sound velocities and thermal conductivities of planetary materials under relevant conditions. Results from studies under this acquisition will thus broadly impact the fields of geophysics and geodynamics because new aspects of elastic and thermal conductivity information are needed to model satisfactorily the seismic, mineralogical, and geodynamic behavior of the deep Earth. Additionally, the system is well suited to study liquids, which are of great importance to the understanding of the properties of volatiles, CO2 sequestration, and other hydrothermal activities relevant to shallower depth of the crust. Under the initiatives of the project, students and postdoctoral researchers will have unique research opportunities to use the advanced laser spectroscopic technique to obtain laboratory results needed to decipher seismic and geochemical observations of the planet?s interior. This will contribute to the education of the next generation of independent researchers with a thorough knowledge of the Earth?s deep interior. Outreach activities in this award focus on exposing K-12th graders to deep-Earth research by involving in the outreach summer programs. Results from this award will be disseminated broadly through teaching, seminars, conferences, and peer-reviewed publications.