COMMISSIONING OF A CRYSTAL ANALYZER FOR INELASTIC SCATTERING AND ADVANCED SPECTR

这个子项目是利用由NIH/NCRR资助的中心拨款提供的资源的许多研究子项目之一。子项目和调查员(PI)可能从另一个NIH来源获得了主要资金，因此可能会出现在其他CRISE条目中。列出的机构是针对中心的，而不一定是针对调查员的机构。一台用于高能量分辨率光谱分析的仪器已经研制完成，部分资金来自资源中心。在实验运行期间，在BL6-2上启用了第一套用于非弹性x射线散射和先进光谱测量(包括x射线发射光谱和位置选择性EXAFS)的晶体分析仪。根据感兴趣的发射线选择分析器光学元件。目前，我们有三个曲率半径为1000 mm的Si(553)晶体。用Si(111)晶体作为束线单色器，在8.9keV下测得总能量分辨率为1.6 eV。假设Si(111)晶体的达尔文宽度为1.3 eV，这表明Si(553)分析器晶体的分辨率优于1 eV。这表明，目前的BL6-2光学配置，加上我们正在开发的分析系统，应该可以在这个能量范围内进行相对较高的分辨率测量。这套特殊的分析器晶体将用于测量铜发射线。已经获得了一系列铜模型络合物的初步数据，表明这一技术可能为金属-配体的结合模式提供新的见解。

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. An instrument for high energy-resolution spectroscopy is beign developed, partly funded by the Resource. An initial set of crystal analyzers for inelastic x-ray scattering and advanced spectroscopic measurements (including x-ray emission spectroscopy and site-selective EXAFS) was commissioned on BL6-2 during the experimental run. The analyzer optics are selected based on the emission lines of interest. Currently, we have three Si(553) crystals with a 1000 mm radius of curvature. Using Si(111) crystals as beam line monochromator, a total energy resolution of ~1.6 eV was measured at 8.9 keV. Assuming a Darwin width of 1.3 eV for Si(111) crystals, this indicates that the Si(553) analyzer crystals have a resolution of better than 1 eV. This shows that the current BL6-2 optics configuration, together with the analyzer system we are developing, should allow for relatively high resolution measurements in this energy range. This particular set of analyzer crystals will be used for measurements of copper emission lines. Preliminary data on a series of copper model complexes in the in the Cu K?¿¿¿¿ XES cross over region have already been obtained, and indicate that this technique may provide new insights into metal-ligand binding modes.