Acquisition of a Multi-Impact Position-Sensitive Detector for a Tomographic Atom-Probe: Atomic Scale Chemical Analysis

获取用于断层扫描原子探针的多重冲击位置敏感探测器：原子尺度化学分析

基本信息

批准号：
9625903
负责人：
David Seidman
金额：
$ 42.1万
依托单位：
Northwestern University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-09-15 至 2003-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9625903&HistoricalAwards=false
关键词：
Acquisition Multi Impact Position Sensitive

项目摘要

9625903 Seidman The tomographic atom probe (TAP) is a fundamental extension of the atom-probe field-ion microscope (APFIM or simply atom probe), which provides atomic-resolution depth profiling capability in one dimension. While the TAP yields three- dimensional (3D) chemical profiles in direct lattice space at a lateral spatial resolution of 0.2-0-5 nm, and a depth resolution equal to the interplanar spacing along the direction being probed (0.2-0.3 nm). The TAP's principal features are: subnanometric 3D images with quantitative compositional information on an atomic scale, multi-impact position sensitive detector (PSD) with 100 anodes that allows for the detection of up to 8ions per field- evaporation pulse, an average detection rate of 1 ion pulse -1 and a pulse frequency of 100 Hz, a million individual atoms can be collected and analyzed in three hours employing a modern work station, high mass resolution (m/m = 200) with atomic scale images in direct lattice space. There is no other instrument with the above unique experimental capabilities of the TAP. This award provides support for the acquisition of a multi- impact PSD, associated data acquisition electronics, a work station, and an advanced visualization program for creating 3D images from the collected data. This TAP will be part of a facility that is named "The Chicago-Area Consortium for Atomic-Scale Chemistry"; in addition to Northwestern University, the University of Illinois' Materials Research Laboratory and Argonne National Laboratory's Materials Science Division are involved. %%% The proposed research centers around problems that require a knowledge of interfacial chemistry on an atomic scale, and chemical information associated with 0.5-2 nm size nuclei that form in the decomposition of alloys of technological importance. ***

9625903 Seidman层析成像原子探针（TAP）是原子 - 探针野外显微镜（APFIM或简单的原子探针）的基本扩展，它在一个维度中提供了原子分辨率深度分析能力。龙头在直接晶格空间中的三维（3D）化学曲线在0.2-0-5 nm的外侧空间分辨率下产生，而深度分辨率等于沿探测的方向（0.2-0.3 nm）的平面间距。 TAP的主要特征是：亚纳尼计的3D图像，具有定量成分信息，上面有原子量表，多撞击位置敏感探测器（PSD），具有100个阳极，可允许检测每个野外蒸发脉冲多达8次的脉冲，平均检测率，平均检测率为1离子脉冲-1，脉冲频率为100 Hz，较高的脉冲频率可以在三个小时内运用，该脉冲量可以运用三个小时，分析三个小时，分析量为三个小时。（m/m = 200）在直接晶格空间中具有原子比例图像。没有其他仪器具有上述龙头的独特实验能力。该奖项为获取多影响PSD，相关的数据采集电子，工作站和高级可视化程序提供了支持，以从收集的数据中创建3D图像。该水龙头将成为一个名为“原子级化学财团”的设施的一部分；除西北大学外，还涉及伊利诺伊大学材料研究实验室和阿贡国家实验室材料科学部。 %%;拟议的研究集中在需要以原子量表了解界面化学知识的问题，以及与0.5-2 nm尺寸核相关的化学信息，这些核是在技术重要性的合金分解中形成的。 ***