Electron probe microanalyzer with field emission gun

带场发射枪的电子探针显微分析仪

• 批准号: 442168718
• 金额: --
• 依托单位: Georg-August-Universität Göttingen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442168718?language=en
• 关键词: Electron; probe; microanalyzer; field; emission

The electron probe microanalyzer (EPMA) is an indispensable instrument in the investigation of solid matter, when precise element distributions with high spatial resolution down to the sub-micrometer range and exact chemical quantifications of the element contents and detection limits down to the lower 10 µg/g range are required. Electron microprobe analysis is thus an important component of quantitative micron-scaled analysis not only in geoscientific research, but also in materials research in general. At the Geowissenschaftliche Zentrum of the University of Göttingen, the microprobe is used by seveal working groups in combination with a large number of other elemental and isotopical analytical methods:(a) The EPMA methodology is indispensable for obtaining very precise results in thermo-barometry. Intensive parameters such as temperature, pressure or oxygen fugacity can be determined more accurately in suitable phase equilibrium systems of mineral reactions than with many other analytical methods. In particular, we will continue to apply and expand "single-phase thermometers" in the coming years. (b) In order to determine geological time rates from non-equilibrated phase systems, the use of a field emission cathode opens up new possibilities for the analysis of shorter time scales or slow diffusion rates of elements for selected mineral reactions. This work helps to understand time-dependent processes, for example in magmatic systems. Experiments will determine diffusion rates in selected melt or solid state systems.(c) The exact elucidation of some redox-sensitive processes of cosmochemical processes has so far failed due to the low lateral resolution of conventional electron beam technology. Here the field emission cathode will contribute to better results.(d) We use the chemical composition of certain minerals and their parageneses to derive their provenances in sedimentary systems. This allows to reconstruct global geodynamic processes.(e) The device is used in archaeometric research: The EPMA is an essential analytical instrument for the analysis of historical glass, as well as for archaeometallurgical process reconstruction.(f) Geological archives are another focus of current and future research projects. Varying elemental conditions of calcifying marine organisms serve as climate archives and can map temperature changes or changing duration of seaice cover. With the applied electron microprobe with field emission source we will achieve an improved spatial resolution of the quantitative micro-scale analysis. The equipment with sensitive analyzer crystals will lead to more precise measurement results and better detectability.

电子探针微量分析仪 (EPMA) 是固体物质研究中不可或缺的仪器，它可以以高空间分辨率精确测量元素分布（低至亚微米范围），并对元素含量进行精确化学定量，检测限低至 10 µg /g 范围因此是定量微米级分析的重要组成部分，不仅在地球科学研究中，而且在一般材料研究中。哥廷根大学 Geowissenschaftliche Zentrum 的多个工作组将微型探针与大量其他元素和同位素分析方法结合使用：(a) EPMA 方法对于在热气压测量中获得非常精确的结果是必不可少的。与许多其他分析方法相比，在合适的矿物反应相系统中可以更准确地确定温度、压力或氧逸度。特别是，我们将继续应用。并在未来几年扩大“单相温度计” (b) 为了确定非平衡相系统的地质时间速率，场发射阴极的使用为分析更短的时间尺度或慢的时间开辟了新的可能性。选定矿物反应的元素扩散速率。这项工作有助于了解时间相关过程，例如在岩浆系统中。实验将确定选定熔体或固态系统中的扩散速率。(c) 一些氧化还原敏感过程的精确阐明。的由于传统电子束技术的横向分辨率较低，宇宙化学过程迄今为止已失败。在这里，场发射阴极将有助于获得更好的结果。(d) 我们利用某些矿物及其共生体的化学成分来推导出它们在沉积系统中的来源。这使得能够重建全球地球动力学过程。(e) 该设备用于考古研究：EPMA 是分析历史玻璃以及重建考古冶金过程的重要分析仪器。(f)地质档案是当前和未来研究项目的另一个重点，钙化海洋生物的不同元素条件可以作为气候档案，并且可以绘制温度变化或海冰覆盖持续时间的图谱，通过应用具有场发射源的电子微探针，我们将实现改进的空间。定量微尺度分析的分辨率高，配备灵敏的分析晶体的设备将带来更精确的测量结果和更好的可检测性。