MRI: Acquisition of a Local-Electrode Atom-Probe (LEAP) Microscope (An Atom-Probe Tomograph) For Three-Dimensional Nanoscale Characterization of Materials

MRI：获取局部电极原子探针 (LEAP) 显微镜（原子探针断层扫描仪），用于材料的三维纳米级表征

• 批准号: 0420532
• 负责人: David Seidman
• 金额: $ 50万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0420532&HistoricalAwards=false
• 关键词: MRI; Acquisition; Local; Electrode; Atom

The instrument to be purchased is a tomographic atom probe, which provides a three-dimensional image of a reconstructed lattice with atomic resolution where the chemical identity of each atom ! is identified. The specific instrument involved is a local-electrode atom-probe (LEAP) microscope manufactured by Imago Scientific Instruments of Madison, Wisconsin. The cost of this instrument is to be shared between the National Science Foundation's Major Research Instrumentation (MRI) program and the Office of Naval Research's DURIP program. Specifically, the NSF is to provide $500,000 toward the purchase of this instrument with $214,000 in cost matching funds provided by Northwestern University. The Office of Naval Research is to provide $590,000 with an additional $295,000 in cost matching funds from Northwestern University for a grand total o f $1,599,000 for the instrument and ancillary equipment. This instrument is to be the show case instrument of the Northwestern University Center for Atom-Probe Tomography (NUCAPT), which is directed by Professor David N. Seidman, Materials Science and Engineering Department. It will be used both for research purposes, as described in the proposal, for a wide range of materials , and also for the education of postdoctoral students, Ph.D. students, and undergraduate students, REU students, in this new characterization technique The local-electrode atom-probe (LEAP) microscope provides a spatial resolution in depth of 0.1 nm and a lateral resolution of 0.2 to 0.5 nm; the latter depends on the particular crystallographic plane, {hkl}, being analyzed. It provides a wide angle view of the surface of a specimen, upwards of 60o to 70o, and is capable of examining a given specimen on a routine basis to a depth of 2 micrometers. The specimen can be pulsed at a frequency of 250,000 Hz to obtain collection rates exceeding 55 million atoms per hour. Thus, data sets of 100 million atoms are readily obtained from a single specimen. The LEAP microscope is an ultrahigh vacuum instrument that operates at an ambient pressure below 10(-10) torr! . A specimen exchange systems perm its six to twelve specimens to be stored under ultrahigh vacuum conditions, which permits the rapid exchange of specimens during the course of a day. The LEAP microscope is computer controlled and the data collected can be analyzed on-line, to a certain level of detail, to evaluate the progress of a run. In addition, software has been and is being developed to further process the collected data to obtain the maximum amount of physical information.

要购买的仪器是一种层析成像原子探针，它提供了带有原子分辨率的重建晶格的三维图像，每个原子的化学身份！确定。 涉及的特定仪器是威斯康星州麦迪逊的Imago Scientific Instruments制造的局部电原子探针（LEAP）显微镜。该工具的成本应在国家科学基金会的主要研究工具（MRI）计划与海军研究办公室Durip计划之间分担。具体而言，NSF将提供500,000美元用于购买该乐器，并提供214,000美元的成本匹配资金，由西北大学提供。 海军研究办公室将提供590,000美元的额外295,000美元的成本相匹配资金，以支付1,599,000澳元的巨大票房和辅助设备。该工具将成为西北大学原子构图中心（Nucapt）的表演案例工具，该中心由材料科学与工程系教授指导。如提案中所述，它将用于研究目的，用于广泛的材料，也将用于博士学位的博士学位。学生和本科生，REU学生在这种新的特征技术中，局部电原子 - 探针（LEAP）显微镜提供了0.1 nm的空间分辨率，横向分辨率为0.2至0.5 nm；后者取决于对特定的晶体学平面{hkl}进行分析。它提供了标本表面的广角视图，超过60o至70o，并且能够在常规的基础上检查给定标本至2微米的深度。标本可以以250,000 Hz的频率脉冲，以获得超过每小时5500万个原子的收集率。因此，很容易从单个标本获得1亿个原子的数据集。 Leap显微镜是一种超高真空仪器，在10（-10）Torr以下的环境压力下运行！ 。标本交换系统允许其六到十二个标本要在超高真空条件下存储，从而允许在一天的过程中快速交换样品。 LEAP显微镜是计算机控制的，可以在线分析收集的数据，以评估运行的进度。此外，已经并且正在开发软件以进一步处理收集的数据以获得最大的物理信息。