Acquisition of a Four-Circle Single-Crystal Diffractometer with CCD Detector

配备 CCD 探测器的四环单晶衍射仪的获得

• 批准号: 9725354
• 负责人: Larry Finger
• 金额: $ 11.75万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725354&HistoricalAwards=false
• 关键词: Acquisition; Four; Circle; Single; Crystal

9725354 Finger This grant provides partial support of the costs of acquiring a new four-circle single-crystal X-ray diffractometer with a CCD detector. This area detector has much higher sensitivity than previous models, and collects two-dimensional sections of the diffracted intensity that can be combined to construct a full three-dimensional view of reciprocal space. With such information, it is possible to study very small or twinned crystals, and to study diffuse scattering arising from various sources of disorder. The X-ray group at the Geophysical Laboratory, consisting of Larry Finger, Charles Prewitt, Robert Hazen, and Hexiong Yang, will develop the necessary techniques to use the CCD detector system with the diamond-anvil cell. With the new instrument, it will be possible to measure lattice constants and perform a crystal- structure refinement in less time than currently used for a lattice-constant determination. High-pressure crystallography is an essential component in understanding phase relations in the deep earth. Once this instrument is installed, 25% of the operating time will be available as a regional resource, with emphasis on the earth science community. It will also be used as a resource in the Laboratory's summer intern program, which is funded a by a REU grant. ***

小行星9725354 这笔赠款提供了购买一台新的带有CCD探测器的四圆单晶X射线衍射仪的部分费用。 这种区域探测器比以前的型号具有更高的灵敏度，并收集衍射强度的二维截面，这些截面可以组合起来构建倒易空间的完整三维视图。 有了这些信息，就有可能研究非常小的或孪生的晶体，并研究各种无序源引起的漫散射。 地球物理实验室的X射线小组由拉里·芬格、查尔斯·普鲁伊特、罗伯特·哈岑和杨和雄组成，他们将开发使用CCD探测器系统和金刚石砧室的必要技术。 有了这种新仪器，就有可能测量晶格常数，并在比目前用于晶格常数测定的时间更短的时间内进行晶体结构细化。 高压晶体学是理解地球深部相关系的重要组成部分。 该仪器安装后，25%的运行时间将作为区域资源，重点是地球科学界。 它也将被用作实验室暑期实习生计划的资源，该计划由REU赠款资助。 ***