NEW SOFT-ENERGY X-RAY ABSORPTION SPECTROSCOPY BEAM LINE

新型软能 X 射线吸收光谱光束线

• 批准号: 8170002
• 负责人: MATTHEW J LATIMER
• 金额: $ 7.8万
• 依托单位: STANFORD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8170002
• 关键词: Air; Computer Retrieval of Information on Scientific Projects Database; Computers; Data; Data Collection; Flowmeters; Funding; Grant; Helium; Institution; Length; Measurement; Monitor; Motion; Oxygen; Research; Research Personnel; Resources; Sampling; Side; Source; Spectrum Analysis; United States National Institutes of Health; absorption; experience; feeding; improved; instrumentation; planetary Atmosphere; sensor

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. A new beam line side station for XAS measurements in the 2-5 keV, BL4-3, range was commissioned in 2008-2009 and brought to general user access in the spring of 2009. In this energy range, x-rays have a very short path length in air and thus the entire beam path is enclosed in a helium atmosphere to enable data collection. The instrumentation developed for this beam line incorporate several features to improve efficiency and ease of use. This includes computer-controlled motorized x-ray slits, a motorized linear motion feed-through, and a computer-controlled shutter to close off the beam between data points (to reduce x-ray induced damage to samples). Oxygen sensors and flowmeters are utilized for monitoring the purity of the helium atmosphere. A LHe cryostream is used for cooling samples to ~50 K. Valuable experience in user mode is being used to further improve the beam line and instrumentation.

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 2008-2009年，一个新的束线侧站投入使用，用于2-5 keV（BL 4 -3）范围内的XAS测量，并于2009年春季供一般用户使用。 在这个能量范围内，X射线在空气中具有非常短的路径长度，因此整个光束路径被封闭在氦气氛中以实现数据收集。为这条光束线开发的仪器具有几个特点，以提高效率和易用性。这包括计算机控制的电动X射线狭缝，电动线性运动馈通装置和计算机控制的快门，以关闭数据点之间的光束（以减少X射线对样品的损伤）。氧传感器和流量计用于监测氦气气氛的纯度。LHe低温流用于将样品冷却至~50 K。用户模式中的宝贵经验正被用于进一步改进束线和仪器。