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

这项主要研究仪器RUI拨款支持购买具有扩展范围平行光束WDS光谱仪的x射线微分析系统，以增加纽约市立大学内多样化教师的当前研究活动，并以史坦顿岛学院为中心。新系统包括两个组成部分。这些组件中的第一个是x射线微分析系统，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。从扫描电镜枪发出的电子束与样品相互作用，激发样品中的元素。然后样品发出二次电子和x射线。所发射的X射线的能量与元素有关。通过EDS系统，可以同时收集二次电子（获得样品的三维图像）和0.1 keV的K - a能量（也在一次电子轰击激发后发射），并获得样品内元素分布的精确图。这些元素包括原子质量等于或大于Be的元素。要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10 keV以下的元素，即用于轻元素检测。该设备将用于与聚合物和生物聚合物中元素分布有关的合作研究工作。研究课题包括金属在纳米管中的排列分析，金属与沉积物的结合，以及水生和陆生生物积累的金属的分布。此次仪器收购支持了史坦顿岛学院和纽约城市大学的一些教育活动。这包括在高级显微镜课程“化学仪器方法”中的使用，以及通过独立研究和荣誉论文课程进行的本科生研究活动。此外，这些仪器将支持史泰登岛学院由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，这些仪器也将用于研究生教育和nsf支持的纳米结构材料和器件的IGERT项目的培训。

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.