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.

电子探针微分析仪（EPMA）是研究固体物质的必不可少的仪器，当具有高空间分辨率的精确元件分布降至亚微米范围，并且需要对元素内容物的精确化学定量和检测到较低的10 µg/g范围的精确化学定量。因此，电子微探测分析是定量微米尺度分析的重要组成部分，不仅在地球科学研究中，而且在材料研究中也是如此。在戈丁根大学的Geowowissenshaftliche Zentrum上，半加工组与大量其他元素和同位素分析方法结合使用了微型探测器：（a）EPMA方法论是不可或缺的，可在热率测定中获得非常精确的结果。与许多其他分析方法相比，在适当的矿物反应的相同相位系统中，可以更准确地确定温度，压力或氧散热的密集参数，更准确地确定。特别是，我们将在未来几年继续应用和扩展“单相温度计”。 （b）为了确定未校准相位系统的地质时间速率，使用场发射阴极为分析较短的时间尺度或元素扩散速率分析所选矿物质反应的元素扩散速率的新可能性。这项工作有助于了解时间相关的过程，例如在岩浆系统中。实验将确定选定的熔体或固态系统中的扩散速率。（c）由于常规电子束技术的横向分辨率较低，迄今为止，宇宙化学过程的某些氧化还原敏感过程的确切阐明已经失败了。在这里，田间发射阴极将有助于更好的结果。（d）我们使用某些矿物质及其副质的化学成分来得出其在沉积系统中的证明。 （e）该设备用于档案计量研究：EPMA是用于分析历史玻璃的必不可少的分析工具，以及档案中的囊性过程重建。（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是气候档案，可以绘制温度变化或海上覆盖时间的变化。使用带有场发射源的施加的电子微探针，我们将实现定量微尺度分析的空间分辨率。具有敏感分析器晶体的设备将导致更精确的测量结果和更好的可检测性。