COMMISSIONING OF A CRYSTAL ANALYZER FOR INELASTIC SCATTERING AND ADVANCED SPECTR

本子项目是利用由NIH/NCRR资助的中心赠款提供的资源的众多研究子项目之一。子项目和研究者（PI）可能已经从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。列出的机构是中心的，不一定是研究者的机构。一种用于高能量分辨率光谱学的仪器开始开发，部分由资源资助。在实验运行期间，BL6-2上安装了一套用于非弹性x射线散射和高级光谱测量（包括x射线发射光谱和位置选择性EXAFS）的初始晶体分析仪。根据感兴趣的发射线选择分析仪光学器件。目前，我们有三个曲率半径为1000毫米的Si（553）晶体。用Si（111）晶体作为束流线单色器，在8.9 keV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）分析仪晶体的分辨率优于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仪系统，应该允许在这个能量范围内进行相对高分辨率的测量。这种特殊的分析仪晶体将用于测量铜发射线。Cu K?中一系列铜模型配合物的初步资料已经获得了x - x交叉区域，并表明该技术可能为金属-配体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.