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.

电子探针显微分析仪（EPMA）是固体物质研究中不可或缺的仪器，当需要精确的元素分布，高空间分辨率低至亚微米范围，元素含量的精确化学定量和检测限低至10 µg/g范围时。因此，电子探针分析不仅在地球科学研究中，而且在一般材料研究中，都是定量微米尺度分析的重要组成部分。在哥廷根大学的地球科学中心，微探针与大量其他元素和同位素分析方法一起被各工作组使用：（a）电子探针分析方法对于获得非常精确的温压测量结果是必不可少的。在合适的矿物反应相平衡体系中，温度、压力或氧逸度等强度参数的测定比许多其他分析方法更精确。特别是，我们将在未来几年继续应用和扩大“单相温度计”。(b)为了从非平衡相系统中确定地质时间速率，场发射阴极的使用为分析选定矿物反应的元素的较短时间尺度或缓慢扩散速率开辟了新的可能性。这项工作有助于理解与时间相关的过程，例如在岩浆系统中。实验将确定选定的熔体或固态系统的扩散速率。(c)由于传统电子束技术的横向分辨率低，迄今为止，对宇宙化学过程中某些氧化还原敏感过程的精确解释一直未能实现。在这里，场发射阴极将有助于更好的结果。(d)我们利用某些矿物的化学成分及其共生体来推断它们在沉积体系中的物源。这可以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考古过程重建的重要分析仪器。(f)地质档案是当前和未来研究项目的另一个重点。钙化海洋生物的各种元素条件可以作为气候档案，并可以绘制温度变化或海冰覆盖持续时间变化的地图。应用场发射电子探针，可以提高定量分析的空间分辨率。具有灵敏分析晶体的设备将导致更精确的测量结果和更好的可检测性。