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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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相关实验视频

Updated: Jul 16, 2025

Atom Probe Tomography Analysis of Exsolved Mineral Phases
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使用极端紫外线触发脉冲的原子探针断层扫描.

Benjamin W Caplins1, Ann N Chiaramonti1, Jacob M Garcia1

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此摘要是机器生成的。

原子探头断层扫描 (APT) 现在使用超快极紫外线 (EUV) 脉冲进行场离子发射. 这种新的方法使得原子分辨率的3D材料分析成为可能,特别是对于半导体和绝缘体.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理 物理学 物理
  • 分析化学 分析化学

背景情况:

  • 原子探头断层扫描 (APT) 是纳米级材料分析的一个关键技术.
  • 传统的APT系统使用可见或近紫外线激光进行场离子蒸发.
  • 目前基于激光的触发方法对于某些材料存在局限性.

研究的目的:

  • 介绍和描述使用超快极紫外线 (EUV) 脉冲的APT仪器.
  • 为了证明EUV光在触发场离子发射中的有效性,用于材料分析.
  • 为APT应用程序详细说明EUV光线的设计和性能.

主要方法:

  • 使用高波生成在一个贵气填充的毛细血管中生成可调节的EUV光 (25-45 eV).
  • 通过定制真空光束线将EUV脉冲传递给APT标本.
  • 欧欧维频谱的特征,焦点点的尺寸和长期源稳定性.
  • 在半导体 (Si,GaN) 和绝缘体 (Al2O3) 上进行APT分析的演示.

主要成果:

  • 成功生成并将可调节的EUV脉冲传递给APT标本.
  • 描述EUV光束线性能,包括光谱演变和焦点尺寸.
  • 证明了EUV源的长期稳定性 (>1年).
  • 使用EUV脉冲成功进行了Si,GaN和Al2O3的场离子发射和APT分析.

结论:

  • 超快速EUV脉冲是一种可行的和有效的替代方案,用于触发APT中的场离子辐射.
  • 这种新方法将APT的适用性扩展到更广泛的材料,包括绝缘体.
  • 开发的基于EUV的APT系统为原子分辨率3D材料表征提供了稳定和高性能解决方案.