Acquisition of a Combined Micro-Raman Spectroscopy and Laser Heating System for In Situ High Pressure and High Temperature Studies

EAR-0337156ShimPartial支架需要安装色散拉曼光谱和激光加热系统，以便使用麻省理工学院的钻石顶锤单元进行现场高压和温度测量。这是PI建立光谱系统的长期计划的第一部分，该系统能够在现场高压和高温下测量矿物的拉曼光谱。该系统将能够在实验室中进行相图和材料热力学性质的现场测定，这是只有在第三代同步加速器中才能做到的。该系统的主要技术进步是：(1)减少了对样品在高温下的热辐射的检测；(2)利用声子模的斯托克斯和反斯托克斯的强度和频率进行温度测量；以及(3)减少了样品的荧光背景。这项建议独立于COMPRES资助的任何工作，其主要目的是允许处于初级教职生涯早期的PI在麻省理工学院建立高压实验室，以便产生高质量的科学成果并在麻省理工学院培训学生。麻省理工学院现有的研究小组也将受益于这种微观分析和拉曼成像技术。由于PI已经成功地与不同的团体合作，该设施将向新英格兰地区的学生和研究人员开放，那里的大型用户设施相对较远。考虑到麻省理工学院位于许多本科生研究所密集的地区，并且该设施将是新英格兰地区唯一的高压矿物物理实验室，该设施预计将为该地区的许多本科生提供实验地球物理研究机会，这对吸引下一代研究人员进入矿物物理社区尤为重要。***

EAR-0337156ShimPartial support is requested to install a dispersive-Raman spectroscopy and a laser heating system for in-situ high pressure and temperature measurements using the diamond-anvil cells at MIT. This is the first part of the PI's long term plan to build a spectroscopy system which enables to measure Raman spectra of minerals at in-situ high pressure and temperature. The system will enable to perform in situ determination of phase diagrams and thermodynamic properties of materials in laboratory, which has been only possible in third generation synchrotron sources. Major technical advances in the system are in (1) reducing the detection of thermal radiations from the sample at high temperature, (2) temperature measurements using the intensity and frequency of the Stokes and anti-Stokes of phonon modes, and (3) reducing the background from the fluorescence of the sample. This proposal is independent of any COMPRES funded work and the primary purpose of this proposal is to allow the PI, who is in his early career as a junior faculty, to set up a high pressure lab at MIT in order to produce high-quality scientific results and train students at MIT. The existing research groups at MIT will also benefit from this micro-analysis and Raman-imaging technology. As the PI has been successfully collaborating with different groups, the facility will be open to students and researchers in the New England area where large user facilities are relatively distant. Considering that MIT is located in the area where many undergraduate institutes are densely populated and this facility will be only high-pressure mineral physics lab in the New England area, the facility is expected to provide research opportunities in experimental geophysics to many undergraduate students in the area and this will be particularly important to attract next generation researchers for mineral physics community. ***