SOFT-ENERGY X-RAY ABSORPTION SPECTROSCOPY BEAM LINE INSTRUMENTATION

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 在BL4-3的2-5keV的XAS测量中，新的束线侧站的槽内仪器继续开发。在这个能量范围内，X射线在空气中的路径长度非常短，因此整个光束路径被封闭在氦大气中，以便能够进行数据收集。为这条光束线开发的仪器结合了几个功能，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，电动直线运动馈送，以及计算机控制的快门，以关闭数据点之间的光束(以减少X射线对样品的损害)。氧传感器和流量计被用来监测氦大气的纯度。LHe冷流用于将样品冷却到~50K。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. In-hutch instrumentation development continued for the new beam line side station for XAS measurements in the 2-5 keV, BL4-3. 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.