RIXS DEVELOPMENT

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。在2005年期间，我们实施了一个新的工作台来支持RIXS光谱仪。购买了一个桌面(Newport IG-46-2)，并将其安装在四个稳定器气动隔离器(Newport I-2000)上。该单片平台同时容纳了样品托架和光谱仪，降低了初始工作台对准的难度，减少了光谱仪的安装时间。我们检测系统的另一个改进是购买了固态硅漂移二极管(SDD)探测器，以取代固态GE探测器，以解决重负载问题。与GE探测器相比，SDD探测器更轻便。在感兴趣的能量范围(5-10keV)，它还具有比Ge探测器(180 EV)更好的能量分辨率(140 EV)，这将减少背景散射。配备了新安装的数字X射线处理器(Xia DXP土星)，线性计数率极限增加了10倍(从每秒20千克增加到250千克/秒)，这将减少使用以前设置所需的扫描时间。以前的分光计布置很复杂，要随着能量的变化而与光束对准和保持对准。我们已经解决了这个问题，将以前的z-2z方案替换为theta-2 theta布置，它要简单得多，也更有效。

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. During the year 2005 we implemented a new table to support the RIXS spectrometer. A table top (Newport IG-46-2) has been purchased and installed on four stabilizer pneumatic isolators (Newport I-2000). This monolithic platform house both sample holder and spectrometer and ease the difficulty of the initial table alignment and reduce the spectrometer setup time. Another improvement of our detection system has been the acquisition of a solid-state Silicon Drift Diode (SDD) detector to replace the solid-state Ge detector to address the heavy load issues. The SDD detector is lightweight compared to the Ge detector. It also has better energy resolution (140 eV) than the Ge detector (180 eV) for the energy range of interest (5-10 KeV), which would reduce the background scattering. Equipped with the newly installed digital x-ray processor (XIA DXP Saturn), the linear count-rate limit has increased 10-fold (from 20 to 250 kilo-count per second), which would reduce the required scan time using the previous setup.. Previous spectrometer arrangements were complex to align and keep aligned with the beam as energy is changes. We have addressed this problem by replacing the previous z-2z scheme by a theta-2 theta arrangement which is much simpler and more effective.