Development of a Short Wavelength Spectroscopic X-ray Microscope for Advanced Materials Research and Student Training

0076357 cyruss这是加州大学圣巴巴拉分校（UCSB）材料研究仪器项目授予的一项仪器开发奖项。UCSB的研究人员将开发一种扫描微探针短波（3.1 a - 0.31 a，光子能量4 keV - 40 keV） x射线显微镜，能够在先进光子源（APS）上以50 nm - 500 nm的空间分辨率进行多种成像模式。该显微镜将允许通过x射线荧光和吸收光谱共定位测定元素分布和化学状态。使用K和L壳层荧光的组合，将有可能绘制周期表中所有元素的空间分布，探测灵敏度接近十亿分之一（ppb），超过带电粒子微探针目前设定的水平的数量级。光谱微成像将通过空间分辨x射线吸收近边缘结构（XANES）测量来完成，它提供了重金属离子在许多生物（如细胞发育）和环境（如污染土壤修复）研究中至关重要的局部氧化态的明确信息。该显微镜将在UCSB建造，并安装在APS，通过分配给一般用户的总光束时间的25%，更广泛的用户社区可以访问。在后期阶段，第二代显微镜将安装在斯坦福大学同步辐射实验室。这种仪器的开发为研究生和本科生的培训提供了极好的机会。该项目还将为丰富当地K-12和社区大学的科学教育做出贡献

0076357CyrusThis is an instrument development award from the Instrumentation for Materials Research program to the University of California Santa Barbara (UCSB). Investigators at UCSB will develop a scanning microprobe short wavelength (3.1 A - 0.31 A, photon energy 4 keV - 40 keV ) x-ray microscope capable of multiple imaging modes with 50 nm - 500 nm spatial resolution at the Advanced Photon Source (APS). The microscope will allow co-localized determination of elemental distribution and chemical states by x-ray fluorescence and absorption spectroscopy. Using a combination of K and L shell fluorescence, it will be possible to map the spatial distribution of all elements in the periodic table with detection sensitivity approaching parts-per-billion (ppb), surpassing by orders of magnitude the current level set by charged-particle microprobes. Spectroscopic micro-imaging will be accomplished by spatially resolved X-ray Absorption Near Edge Structure (XANES) measurements, which provide definitive information on the local oxidation states of heavy metallo-ions vitally important in many biological (e.g. cellular development) and environmental (e.g. contaminated soil remediation) studies. The microscope will be constructed at UCSB and installed at the APS accessible by the broader user community through the 25% of total beam time allocated to general users. At a later stage, a second generation microscope will be installed at the Stanford Synchrotron Radiation Laboratory. This instrument development provides excellent opportunities for the training of graduate and undergraduate students. The project will also contribute to enriching of science education for local K-12, and community college.***