Acquisition of a Laser Raman Spectrometer for Studies on Phase Transition and Melting Silicate Minerals and Glasses at Ultra-high Temperature.

购买激光拉曼光谱仪，用于研究超高温下的相变和熔融硅酸盐矿物和玻璃。

• 批准号: 8916579
• 负责人: Subrata Ghose
• 金额: $ 12.88万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916579&HistoricalAwards=false
• 关键词: Acquisition; Laser; Raman; Spectrometer; Studies

This award provides funds for one-half the cost of acquiring a time-resolved laser Raman spectrometer system that will be installed and operated in the Department of Geological Sciences at the University of Washington. The University of Washington is committed to providing the remaining half required. The instrument system will be used to study the microscopic mechanism and dynamics of solid-state phase transitions and of melting in silicates at temperatures up to 3000K. Localized heating of the sample will involve radiation by a continuous- power CO2 laser, with the silicate crystals or glass acting as its own crucible container. Intense black-body radiation from the sample at high-temperature will be suppressed using a synchronous detection technique that involves pulsed-excitation and gated-array detection. The sample temperature will be determined from Raman intensities by Stokes/antiStokes ratioing and by means of a two color optical pyrometer. The high- temperature Raman spectra will be interpreted by molecular dynamics simulations. The molecular level structures of silicates at high-temperature are vital data for interpreting the nature of melting and other phase transitions inside the Earth.

该合同为购买时间分辨激光拉曼光谱仪系统提供一半的资金，该系统将在华盛顿大学地质科学系安装和运行。华盛顿大学承诺提供剩余所需的一半资金。该仪器系统将用于研究固态相变和3000K以下硅酸盐熔化的微观机制和动力学。样品的局部加热将涉及到连续功率的二氧化碳激光器的辐射，硅酸盐晶体或玻璃充当它自己的坩埚容器。利用脉冲激发和门控阵列检测的同步检测技术，将抑制样品在高温下发出的强烈黑体辐射。样品温度将由拉曼强度通过斯托克斯/反斯托克斯比率和双色光学高温计确定。高温拉曼光谱将通过分子动力学模拟来解释。高温下硅酸盐的分子级结构对于解释地球内部熔融和其他相变的性质是至关重要的数据。