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

要求部分支持安装色散拉曼光谱和激光加热系统，用于使用麻省理工学院的金刚石砧细胞进行现场高压和温度测量。这是PI长期计划的第一部分，该计划旨在建立一个光谱系统，该系统能够在原位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对材料的相图和热力学性质进行原位测定，这在第三代同步加速器源中是唯一可能的。该系统的主要技术进步在于：(1)减少了对高温下样品热辐射的检测，(2)利用声子的Stokes和反Stokes模式的强度和频率进行温度测量，(3)减少了样品荧光的背景。该提案独立于COMPRES资助的任何工作，该提案的主要目的是允许PI作为初级教师在麻省理工学院建立一个高压实验室，以产生高质量的科学成果并在麻省理工学院培养学生。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，该设施将向大型用户设施相对较远的新英格兰地区的学生和研究人员开放。考虑到MIT位于众多本科院校密集的地区，该设施将是新英格兰地区唯一的高压矿物物理实验室，该设施有望为该地区的许多本科生提供实验地球物理学的研究机会，这对吸引下一代矿物物理学界的研究人员尤为重要。＊＊＊

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. ***