MRI/RUI: Acquisition of an X-ray Microanalysis System with WDS Spectrometer for Elemental Analyses

这笔重大研究仪器RI赠款支持购买一台配备大范围平行光束WDS光谱仪的X射线显微分析系统，以加强纽约州立大学内以斯塔滕岛学院为中心的不同教职人员目前的研究活动。新系统包括两个集成组件。这些组件中的第一个是X射线显微分析系统，该系统利用能量色散光谱(EDS)从样品中收集、识别和绘制X射线光谱。来自扫描电子显微镜的电子束与样品相互作用，激发样品中的元素。然后，样品会发出二次电子和X射线。发射的X射线的能量是特定于元素的。通过EDS系统，可以同时收集二次电子(以获得样品的三维图像)和0.1keV的Ka能量(也是在一次电子轰击激发后发射的)，并获得样品中元素的准确分布图。这些元素包括原子质量等于或大于Be的元素。将获得的第二个组件是平行光束波长色散光谱(WDS)系统。WDS系统允许检测10keV以下的元素，即轻元素检测。该设备将用于与聚合物和生物聚合物中的元素分布有关的合作研究工作。研究课题包括分析金属在纳米管中的排列，金属与沉积物的结合，以及水生和陆地生物积累的金属的分布。这项仪器采购支持斯塔滕岛学院和纽约城市大学的一些教育活动。这包括它在高级显微镜课程“化学中的仪器方法”中的使用，以及通过独立研究和荣誉论文计划进行的本科生研究活动。此外，这些仪器将支持斯塔滕岛学院由NSF资助的聚合物和生物聚合物REU项目以及环境科学中心的研究活动。由于生物系和化学系已经建立了跨学科的研究和教学方法，这些仪器也将用于NSF支持的纳米结构材料和器件IGERT项目的研究生教育和培训。

This Major Research Instrumentation RUI grant supports the acquisition of an X-ray microanalysis system with extended range parallel beam WDS spectrometer to augment the current research activities of a diverse faculty within CUNY and centered at the College of Staten Island. The new system includes two integrated components. The first of these components is an X-ray microanalysis system that utilizes energy dispersive spectroscopy (EDS) to collect, identify and map X-ray spectra from the samples. The electron beam from the SEM gun interacts with a sample, exciting elements in the sample. The sample then emits secondary electrons and X-rays. The energy of the X- rays emitted is element specific. Through the EDS system, it is possible to simultaneously collect secondary electrons (to obtain a three-dimensional image of a sample) and K a energies of 0.1 keV (also emitted following excitation by the primary electron bombardment) and to obtain an accurate map of the distribution of elements within a sample. These elements include those of atomic mass equal to or greater than Be. The second component to be acquired is a parallel beam wavelength dispersive spectroscopy (WDS) system. The WDS system allows for the detection of elements from 10 keV, that is, for light element detection. The equipment will be used in collaborative research efforts related to elemental distribution within polymers and biopolymers. Research topics include analysis of the alignment of metals in nanotubes, binding of metals to sediments, and distribution of metal bioaccumulated by aquatic and terrestrial organisms.This instrumentation acquisition supports a number of educational activities both at the College of Staten Island and the City University of New York. This includes its use in an Advanced Microscopy course "Instrumental Methods in Chemistry" and undergraduate research activities through the Independent Studies and Honors Thesis programs. Additionally, the instruments will support research activities in the College of Staten Island's NSF-funded REU program on Polymers and Biopolymers, as well as the Center for Environmental Science. As the Departments of Biology and Chemistry have an established interdisciplinary approach to research and teaching, the instruments will also be used in graduate education and training in the NSF-supported IGERT program on Nanostructural Materials and Devices.