Upgrade of X-ray Diffraction Facility

这笔赠款提供29,000美元，作为购买设备升级科罗拉多大学x射线衍射（XRD）设施费用的一半。具体来说，将购买的设备将升级科罗拉多的单晶和粉末XRD仪器。用于高p /T x射线衍射研究的单晶x射线衍射仪将升级为两个金刚石顶压室、一个压力测量光谱仪、一个高温真空晶体安装系统、一台奔腾电脑和NIST晶体数据文件，而粉末x射线衍射仪的升级将包括一台新的计算机和自动化控制软件以及JCPDS粉末衍射光盘数据库。还需要购买一个备用的Mo阳极。PI对了解硅酸盐（特别是尖晶石）含水高压相的晶体化学的贡献，对了解全球水循环，包括俯冲带内水输送到地幔的机制及其对弧火山作用的影响具有重要意义。这些升级将大大提高美国为数不多的用于地球科学的单晶XRD设备之一的高P/T XRD能力。＊＊＊

9614919 Smyth This grant provides $29,000 as one-half support of the costs of acquiring equipment to upgrade the X-ray diffraction (XRD) facility at the University of Colorado. Specifically, the equipment that will be purchased will upgrade both the single crystal and powder XRD instruments at Colorado. Two diamond anvil cells, a pressure measurement spectrometer, a high temperature, vacuum crystal mounting system, a Pentium PC and NIST Crystal Data file will upgrade the single crystal XRD for high-P/T XRD studies, while upgrade of the powder XRD will include a new computer and automated control software and the JCPDS powder diffraction CD-ROM database. A spare Mo anode will also be purchased. The PI's contributions to understanding the crystal chemistry of hydrous, high-pressure phases of silicates, notably -spinel, is of fundamental importance to understanding the global water cycle including mechanisms of water transport to the mantle within subduction zones and its effect on arc volcanism. These upgrades will greatly improve the high P/T XRD capabilities of one of the few remaining single crystal XRD facilities in the U.S. that is devoted to the Earth Sciences. ***